fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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792 lines
33 KiB
792 lines
33 KiB
// Copyright (c) 2018-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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#include "db/error_handler.h"
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#include "db/db_impl/db_impl.h"
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#include "db/event_helpers.h"
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#include "file/sst_file_manager_impl.h"
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#include "logging/logging.h"
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#include "port/lang.h"
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namespace ROCKSDB_NAMESPACE {
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// Maps to help decide the severity of an error based on the
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// BackgroundErrorReason, Code, SubCode and whether db_options.paranoid_checks
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// is set or not. There are 3 maps, going from most specific to least specific
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// (i.e from all 4 fields in a tuple to only the BackgroundErrorReason and
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// paranoid_checks). The less specific map serves as a catch all in case we miss
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// a specific error code or subcode.
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std::map<std::tuple<BackgroundErrorReason, Status::Code, Status::SubCode, bool>,
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Status::Severity>
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ErrorSeverityMap = {
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// Errors during BG compaction
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{std::make_tuple(BackgroundErrorReason::kCompaction,
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Status::Code::kIOError, Status::SubCode::kNoSpace,
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true),
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Status::Severity::kSoftError},
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{std::make_tuple(BackgroundErrorReason::kCompaction,
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Status::Code::kIOError, Status::SubCode::kNoSpace,
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false),
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Status::Severity::kNoError},
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{std::make_tuple(BackgroundErrorReason::kCompaction,
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Status::Code::kIOError, Status::SubCode::kSpaceLimit,
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true),
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Status::Severity::kHardError},
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{std::make_tuple(BackgroundErrorReason::kCompaction,
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Status::Code::kIOError, Status::SubCode::kIOFenced,
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true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kCompaction,
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Status::Code::kIOError, Status::SubCode::kIOFenced,
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false),
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Status::Severity::kFatalError},
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// Errors during BG flush
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{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
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Status::SubCode::kNoSpace, true),
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Status::Severity::kHardError},
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{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
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Status::SubCode::kNoSpace, false),
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Status::Severity::kNoError},
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{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
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Status::SubCode::kSpaceLimit, true),
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Status::Severity::kHardError},
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{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
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Status::SubCode::kIOFenced, true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
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Status::SubCode::kIOFenced, false),
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Status::Severity::kFatalError},
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// Errors during Write
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{std::make_tuple(BackgroundErrorReason::kWriteCallback,
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Status::Code::kIOError, Status::SubCode::kNoSpace,
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true),
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Status::Severity::kHardError},
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{std::make_tuple(BackgroundErrorReason::kWriteCallback,
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Status::Code::kIOError, Status::SubCode::kNoSpace,
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false),
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Status::Severity::kHardError},
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{std::make_tuple(BackgroundErrorReason::kWriteCallback,
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Status::Code::kIOError, Status::SubCode::kIOFenced,
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true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kWriteCallback,
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Status::Code::kIOError, Status::SubCode::kIOFenced,
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false),
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Status::Severity::kFatalError},
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// Errors during MANIFEST write
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{std::make_tuple(BackgroundErrorReason::kManifestWrite,
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Status::Code::kIOError, Status::SubCode::kNoSpace,
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true),
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Status::Severity::kHardError},
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{std::make_tuple(BackgroundErrorReason::kManifestWrite,
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Status::Code::kIOError, Status::SubCode::kNoSpace,
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false),
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Status::Severity::kHardError},
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{std::make_tuple(BackgroundErrorReason::kManifestWrite,
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Status::Code::kIOError, Status::SubCode::kIOFenced,
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true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kManifestWrite,
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Status::Code::kIOError, Status::SubCode::kIOFenced,
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false),
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Status::Severity::kFatalError},
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// Errors during BG flush with WAL disabled
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{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
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Status::Code::kIOError, Status::SubCode::kNoSpace,
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true),
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Status::Severity::kHardError},
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{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
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Status::Code::kIOError, Status::SubCode::kNoSpace,
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false),
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Status::Severity::kNoError},
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{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
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Status::Code::kIOError, Status::SubCode::kSpaceLimit,
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true),
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Status::Severity::kHardError},
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{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
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Status::Code::kIOError, Status::SubCode::kIOFenced,
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true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
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Status::Code::kIOError, Status::SubCode::kIOFenced,
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false),
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Status::Severity::kFatalError},
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// Errors during MANIFEST write when WAL is disabled
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{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
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Status::Code::kIOError, Status::SubCode::kNoSpace,
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true),
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Status::Severity::kHardError},
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{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
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Status::Code::kIOError, Status::SubCode::kNoSpace,
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false),
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Status::Severity::kHardError},
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{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
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Status::Code::kIOError, Status::SubCode::kIOFenced,
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true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
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Status::Code::kIOError, Status::SubCode::kIOFenced,
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false),
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Status::Severity::kFatalError},
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};
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std::map<std::tuple<BackgroundErrorReason, Status::Code, bool>,
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Status::Severity>
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DefaultErrorSeverityMap = {
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// Errors during BG compaction
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{std::make_tuple(BackgroundErrorReason::kCompaction,
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Status::Code::kCorruption, true),
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Status::Severity::kUnrecoverableError},
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{std::make_tuple(BackgroundErrorReason::kCompaction,
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Status::Code::kCorruption, false),
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Status::Severity::kNoError},
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{std::make_tuple(BackgroundErrorReason::kCompaction,
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Status::Code::kIOError, true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kCompaction,
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Status::Code::kIOError, false),
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Status::Severity::kNoError},
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// Errors during BG flush
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{std::make_tuple(BackgroundErrorReason::kFlush,
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Status::Code::kCorruption, true),
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Status::Severity::kUnrecoverableError},
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{std::make_tuple(BackgroundErrorReason::kFlush,
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Status::Code::kCorruption, false),
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Status::Severity::kNoError},
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{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
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true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
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false),
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Status::Severity::kNoError},
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// Errors during Write
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{std::make_tuple(BackgroundErrorReason::kWriteCallback,
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Status::Code::kCorruption, true),
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Status::Severity::kUnrecoverableError},
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{std::make_tuple(BackgroundErrorReason::kWriteCallback,
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Status::Code::kCorruption, false),
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Status::Severity::kNoError},
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{std::make_tuple(BackgroundErrorReason::kWriteCallback,
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Status::Code::kIOError, true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kWriteCallback,
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Status::Code::kIOError, false),
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Status::Severity::kNoError},
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{std::make_tuple(BackgroundErrorReason::kManifestWrite,
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Status::Code::kIOError, true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kManifestWrite,
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Status::Code::kIOError, false),
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Status::Severity::kFatalError},
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// Errors during BG flush with WAL disabled
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{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
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Status::Code::kCorruption, true),
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Status::Severity::kUnrecoverableError},
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{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
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Status::Code::kCorruption, false),
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Status::Severity::kNoError},
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{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
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Status::Code::kIOError, true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
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Status::Code::kIOError, false),
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Status::Severity::kNoError},
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{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
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Status::Code::kIOError, true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
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Status::Code::kIOError, false),
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Status::Severity::kFatalError},
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};
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std::map<std::tuple<BackgroundErrorReason, bool>, Status::Severity>
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DefaultReasonMap = {
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// Errors during BG compaction
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{std::make_tuple(BackgroundErrorReason::kCompaction, true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kCompaction, false),
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Status::Severity::kNoError},
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// Errors during BG flush
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{std::make_tuple(BackgroundErrorReason::kFlush, true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kFlush, false),
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Status::Severity::kNoError},
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// Errors during Write
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{std::make_tuple(BackgroundErrorReason::kWriteCallback, true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kWriteCallback, false),
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Status::Severity::kFatalError},
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// Errors during Memtable update
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{std::make_tuple(BackgroundErrorReason::kMemTable, true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kMemTable, false),
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Status::Severity::kFatalError},
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};
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void ErrorHandler::CancelErrorRecovery() {
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db_mutex_->AssertHeld();
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// We'll release the lock before calling sfm, so make sure no new
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// recovery gets scheduled at that point
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auto_recovery_ = false;
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SstFileManagerImpl* sfm =
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reinterpret_cast<SstFileManagerImpl*>(db_options_.sst_file_manager.get());
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if (sfm) {
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// This may or may not cancel a pending recovery
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db_mutex_->Unlock();
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bool cancelled = sfm->CancelErrorRecovery(this);
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db_mutex_->Lock();
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if (cancelled) {
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recovery_in_prog_ = false;
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}
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}
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// If auto recovery is also runing to resume from the retryable error,
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// we should wait and end the auto recovery.
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EndAutoRecovery();
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}
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STATIC_AVOID_DESTRUCTION(const Status, kOkStatus){Status::OK()};
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// This is the main function for looking at an error during a background
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// operation and deciding the severity, and error recovery strategy. The high
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// level algorithm is as follows -
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// 1. Classify the severity of the error based on the ErrorSeverityMap,
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// DefaultErrorSeverityMap and DefaultReasonMap defined earlier
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// 2. Call a Status code specific override function to adjust the severity
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// if needed. The reason for this is our ability to recover may depend on
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// the exact options enabled in DBOptions
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// 3. Determine if auto recovery is possible. A listener notification callback
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// is called, which can disable the auto recovery even if we decide its
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// feasible
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// 4. For Status::NoSpace() errors, rely on SstFileManagerImpl to control
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// the actual recovery. If no sst file manager is specified in DBOptions,
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// a default one is allocated during DB::Open(), so there will always be
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// one.
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// This can also get called as part of a recovery operation. In that case, we
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// also track the error separately in recovery_error_ so we can tell in the
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// end whether recovery succeeded or not
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const Status& ErrorHandler::HandleKnownErrors(const Status& bg_err,
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BackgroundErrorReason reason) {
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db_mutex_->AssertHeld();
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if (bg_err.ok()) {
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return kOkStatus;
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}
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if (bg_error_stats_ != nullptr) {
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RecordTick(bg_error_stats_.get(), ERROR_HANDLER_BG_ERROR_COUNT);
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}
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ROCKS_LOG_INFO(db_options_.info_log,
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"ErrorHandler: Set regular background error\n");
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bool paranoid = db_options_.paranoid_checks;
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Status::Severity sev = Status::Severity::kFatalError;
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Status new_bg_err;
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DBRecoverContext context;
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bool found = false;
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{
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auto entry = ErrorSeverityMap.find(
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std::make_tuple(reason, bg_err.code(), bg_err.subcode(), paranoid));
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if (entry != ErrorSeverityMap.end()) {
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sev = entry->second;
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found = true;
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}
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}
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if (!found) {
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auto entry = DefaultErrorSeverityMap.find(
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std::make_tuple(reason, bg_err.code(), paranoid));
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if (entry != DefaultErrorSeverityMap.end()) {
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sev = entry->second;
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found = true;
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}
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}
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if (!found) {
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auto entry = DefaultReasonMap.find(std::make_tuple(reason, paranoid));
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if (entry != DefaultReasonMap.end()) {
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sev = entry->second;
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}
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}
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new_bg_err = Status(bg_err, sev);
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// Check if recovery is currently in progress. If it is, we will save this
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// error so we can check it at the end to see if recovery succeeded or not
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if (recovery_in_prog_ && recovery_error_.ok()) {
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recovery_error_ = new_bg_err;
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}
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bool auto_recovery = auto_recovery_;
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if (new_bg_err.severity() >= Status::Severity::kFatalError && auto_recovery) {
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auto_recovery = false;
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}
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// Allow some error specific overrides
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if (new_bg_err.subcode() == IOStatus::SubCode::kNoSpace ||
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new_bg_err.subcode() == IOStatus::SubCode::kSpaceLimit) {
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new_bg_err = OverrideNoSpaceError(new_bg_err, &auto_recovery);
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}
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if (!new_bg_err.ok()) {
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Status s = new_bg_err;
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EventHelpers::NotifyOnBackgroundError(db_options_.listeners, reason, &s,
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db_mutex_, &auto_recovery);
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if (!s.ok() && (s.severity() > bg_error_.severity())) {
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bg_error_ = s;
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} else {
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// This error is less severe than previously encountered error. Don't
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// take any further action
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return bg_error_;
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}
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}
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recover_context_ = context;
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if (auto_recovery) {
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recovery_in_prog_ = true;
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// Kick-off error specific recovery
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if (new_bg_err.subcode() == IOStatus::SubCode::kNoSpace ||
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new_bg_err.subcode() == IOStatus::SubCode::kSpaceLimit) {
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RecoverFromNoSpace();
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}
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}
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if (bg_error_.severity() >= Status::Severity::kHardError) {
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is_db_stopped_.store(true, std::memory_order_release);
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}
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return bg_error_;
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}
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// This is the main function for looking at IO related error during the
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// background operations. The main logic is:
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// 1) File scope IO error is treated as retryable IO error in the write
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// path. In RocksDB, If a file has write IO error and it is at file scope,
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// RocksDB never write to the same file again. RocksDB will create a new
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// file and rewrite the whole content. Thus, it is retryable.
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// 1) if the error is caused by data loss, the error is mapped to
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// unrecoverable error. Application/user must take action to handle
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// this situation (File scope case is excluded).
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// 2) if the error is a Retryable IO error (i.e., it is a file scope IO error,
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// or its retryable flag is set and not a data loss error), auto resume
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// will be called and the auto resume can be controlled by resume count
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// and resume interval options. There are three sub-cases:
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// a) if the error happens during compaction, it is mapped to a soft error.
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// the compaction thread will reschedule a new compaction.
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// b) if the error happens during flush and also WAL is empty, it is mapped
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// to a soft error. Note that, it includes the case that IO error happens
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// in SST or manifest write during flush.
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// c) all other errors are mapped to hard error.
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// 3) for other cases, SetBGError(const Status& bg_err, BackgroundErrorReason
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// reason) will be called to handle other error cases.
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const Status& ErrorHandler::SetBGError(const Status& bg_status,
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BackgroundErrorReason reason) {
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db_mutex_->AssertHeld();
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Status tmp_status = bg_status;
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IOStatus bg_io_err = status_to_io_status(std::move(tmp_status));
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if (bg_io_err.ok()) {
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return kOkStatus;
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}
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ROCKS_LOG_WARN(db_options_.info_log, "Background IO error %s",
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bg_io_err.ToString().c_str());
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if (recovery_in_prog_ && recovery_io_error_.ok()) {
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recovery_io_error_ = bg_io_err;
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}
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if (BackgroundErrorReason::kManifestWrite == reason ||
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BackgroundErrorReason::kManifestWriteNoWAL == reason) {
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// Always returns ok
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ROCKS_LOG_INFO(db_options_.info_log, "Disabling File Deletions");
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db_->DisableFileDeletionsWithLock().PermitUncheckedError();
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}
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Status new_bg_io_err = bg_io_err;
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DBRecoverContext context;
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if (bg_io_err.GetScope() != IOStatus::IOErrorScope::kIOErrorScopeFile &&
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bg_io_err.GetDataLoss()) {
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// First, data loss (non file scope) is treated as unrecoverable error. So
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// it can directly overwrite any existing bg_error_.
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bool auto_recovery = false;
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Status bg_err(new_bg_io_err, Status::Severity::kUnrecoverableError);
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CheckAndSetRecoveryAndBGError(bg_err);
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if (bg_error_stats_ != nullptr) {
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RecordTick(bg_error_stats_.get(), ERROR_HANDLER_BG_ERROR_COUNT);
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RecordTick(bg_error_stats_.get(), ERROR_HANDLER_BG_IO_ERROR_COUNT);
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}
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ROCKS_LOG_INFO(
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db_options_.info_log,
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"ErrorHandler: Set background IO error as unrecoverable error\n");
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EventHelpers::NotifyOnBackgroundError(db_options_.listeners, reason,
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&bg_err, db_mutex_, &auto_recovery);
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recover_context_ = context;
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return bg_error_;
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} else if (bg_io_err.subcode() != IOStatus::SubCode::kNoSpace &&
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(bg_io_err.GetScope() ==
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IOStatus::IOErrorScope::kIOErrorScopeFile ||
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bg_io_err.GetRetryable())) {
|
|
// Second, check if the error is a retryable IO error (file scope IO error
|
|
// is also treated as retryable IO error in RocksDB write path). if it is
|
|
// retryable error and its severity is higher than bg_error_, overwrite the
|
|
// bg_error_ with new error. In current stage, for retryable IO error of
|
|
// compaction, treat it as soft error. In other cases, treat the retryable
|
|
// IO error as hard error. Note that, all the NoSpace error should be
|
|
// handled by the SstFileManager::StartErrorRecovery(). Therefore, no matter
|
|
// it is retryable or file scope, this logic will be bypassed.
|
|
bool auto_recovery = false;
|
|
EventHelpers::NotifyOnBackgroundError(db_options_.listeners, reason,
|
|
&new_bg_io_err, db_mutex_,
|
|
&auto_recovery);
|
|
if (bg_error_stats_ != nullptr) {
|
|
RecordTick(bg_error_stats_.get(), ERROR_HANDLER_BG_ERROR_COUNT);
|
|
RecordTick(bg_error_stats_.get(), ERROR_HANDLER_BG_IO_ERROR_COUNT);
|
|
RecordTick(bg_error_stats_.get(),
|
|
ERROR_HANDLER_BG_RETRYABLE_IO_ERROR_COUNT);
|
|
}
|
|
ROCKS_LOG_INFO(db_options_.info_log,
|
|
"ErrorHandler: Set background retryable IO error\n");
|
|
if (BackgroundErrorReason::kCompaction == reason) {
|
|
// We map the retryable IO error during compaction to soft error. Since
|
|
// compaction can reschedule by itself. We will not set the BG error in
|
|
// this case
|
|
// TODO: a better way to set or clean the retryable IO error which
|
|
// happens during compaction SST file write.
|
|
if (bg_error_stats_ != nullptr) {
|
|
RecordTick(bg_error_stats_.get(), ERROR_HANDLER_AUTORESUME_COUNT);
|
|
}
|
|
ROCKS_LOG_INFO(
|
|
db_options_.info_log,
|
|
"ErrorHandler: Compaction will schedule by itself to resume\n");
|
|
return bg_error_;
|
|
} else if (BackgroundErrorReason::kFlushNoWAL == reason ||
|
|
BackgroundErrorReason::kManifestWriteNoWAL == reason) {
|
|
// When the BG Retryable IO error reason is flush without WAL,
|
|
// We map it to a soft error. At the same time, all the background work
|
|
// should be stopped except the BG work from recovery. Therefore, we
|
|
// set the soft_error_no_bg_work_ to true. At the same time, since DB
|
|
// continues to receive writes when BG error is soft error, to avoid
|
|
// to many small memtable being generated during auto resume, the flush
|
|
// reason is set to kErrorRecoveryRetryFlush.
|
|
Status bg_err(new_bg_io_err, Status::Severity::kSoftError);
|
|
CheckAndSetRecoveryAndBGError(bg_err);
|
|
soft_error_no_bg_work_ = true;
|
|
context.flush_reason = FlushReason::kErrorRecoveryRetryFlush;
|
|
recover_context_ = context;
|
|
return StartRecoverFromRetryableBGIOError(bg_io_err);
|
|
} else {
|
|
Status bg_err(new_bg_io_err, Status::Severity::kHardError);
|
|
CheckAndSetRecoveryAndBGError(bg_err);
|
|
recover_context_ = context;
|
|
return StartRecoverFromRetryableBGIOError(bg_io_err);
|
|
}
|
|
} else {
|
|
if (bg_error_stats_ != nullptr) {
|
|
RecordTick(bg_error_stats_.get(), ERROR_HANDLER_BG_IO_ERROR_COUNT);
|
|
}
|
|
// HandleKnownErrors() will use recovery_error_, so ignore
|
|
// recovery_io_error_.
|
|
// TODO: Do some refactoring and use only one recovery_error_
|
|
recovery_io_error_.PermitUncheckedError();
|
|
return HandleKnownErrors(new_bg_io_err, reason);
|
|
}
|
|
}
|
|
|
|
Status ErrorHandler::OverrideNoSpaceError(const Status& bg_error,
|
|
bool* auto_recovery) {
|
|
if (bg_error.severity() >= Status::Severity::kFatalError) {
|
|
return bg_error;
|
|
}
|
|
|
|
if (db_options_.sst_file_manager.get() == nullptr) {
|
|
// We rely on SFM to poll for enough disk space and recover
|
|
*auto_recovery = false;
|
|
return bg_error;
|
|
}
|
|
|
|
if (db_options_.allow_2pc &&
|
|
(bg_error.severity() <= Status::Severity::kSoftError)) {
|
|
// Don't know how to recover, as the contents of the current WAL file may
|
|
// be inconsistent, and it may be needed for 2PC. If 2PC is not enabled,
|
|
// we can just flush the memtable and discard the log
|
|
*auto_recovery = false;
|
|
return Status(bg_error, Status::Severity::kFatalError);
|
|
}
|
|
|
|
{
|
|
uint64_t free_space;
|
|
if (db_options_.env->GetFreeSpace(db_options_.db_paths[0].path,
|
|
&free_space) == Status::NotSupported()) {
|
|
*auto_recovery = false;
|
|
}
|
|
}
|
|
|
|
return bg_error;
|
|
}
|
|
|
|
void ErrorHandler::RecoverFromNoSpace() {
|
|
SstFileManagerImpl* sfm =
|
|
reinterpret_cast<SstFileManagerImpl*>(db_options_.sst_file_manager.get());
|
|
|
|
// Inform SFM of the error, so it can kick-off the recovery
|
|
if (sfm) {
|
|
sfm->StartErrorRecovery(this, bg_error_);
|
|
}
|
|
}
|
|
|
|
Status ErrorHandler::ClearBGError() {
|
|
db_mutex_->AssertHeld();
|
|
|
|
// Signal that recovery succeeded
|
|
if (recovery_error_.ok()) {
|
|
Status old_bg_error = bg_error_;
|
|
// old_bg_error is only for notifying listeners, so may not be checked
|
|
old_bg_error.PermitUncheckedError();
|
|
// Clear and check the recovery IO and BG error
|
|
bg_error_ = Status::OK();
|
|
recovery_io_error_ = IOStatus::OK();
|
|
bg_error_.PermitUncheckedError();
|
|
recovery_io_error_.PermitUncheckedError();
|
|
recovery_in_prog_ = false;
|
|
soft_error_no_bg_work_ = false;
|
|
EventHelpers::NotifyOnErrorRecoveryEnd(db_options_.listeners, old_bg_error,
|
|
bg_error_, db_mutex_);
|
|
}
|
|
return recovery_error_;
|
|
}
|
|
|
|
Status ErrorHandler::RecoverFromBGError(bool is_manual) {
|
|
InstrumentedMutexLock l(db_mutex_);
|
|
bool no_bg_work_original_flag = soft_error_no_bg_work_;
|
|
if (is_manual) {
|
|
// If its a manual recovery and there's a background recovery in progress
|
|
// return busy status
|
|
if (recovery_in_prog_) {
|
|
return Status::Busy();
|
|
}
|
|
recovery_in_prog_ = true;
|
|
|
|
// In manual resume, we allow the bg work to run. If it is a auto resume,
|
|
// the bg work should follow this tag.
|
|
soft_error_no_bg_work_ = false;
|
|
|
|
// In manual resume, if the bg error is a soft error and also requires
|
|
// no bg work, the error must be recovered by call the flush with
|
|
// flush reason: kErrorRecoveryRetryFlush. In other case, the flush
|
|
// reason is set to kErrorRecovery.
|
|
if (no_bg_work_original_flag) {
|
|
recover_context_.flush_reason = FlushReason::kErrorRecoveryRetryFlush;
|
|
} else {
|
|
recover_context_.flush_reason = FlushReason::kErrorRecovery;
|
|
}
|
|
}
|
|
|
|
if (bg_error_.severity() == Status::Severity::kSoftError &&
|
|
recover_context_.flush_reason == FlushReason::kErrorRecovery) {
|
|
// Simply clear the background error and return
|
|
recovery_error_ = Status::OK();
|
|
return ClearBGError();
|
|
}
|
|
|
|
// Reset recovery_error_. We will use this to record any errors that happen
|
|
// during the recovery process. While recovering, the only operations that
|
|
// can generate background errors should be the flush operations
|
|
recovery_error_ = Status::OK();
|
|
recovery_error_.PermitUncheckedError();
|
|
Status s = db_->ResumeImpl(recover_context_);
|
|
if (s.ok()) {
|
|
soft_error_no_bg_work_ = false;
|
|
} else {
|
|
soft_error_no_bg_work_ = no_bg_work_original_flag;
|
|
}
|
|
|
|
// For manual recover, shutdown, and fatal error cases, set
|
|
// recovery_in_prog_ to false. For automatic background recovery, leave it
|
|
// as is regardless of success or failure as it will be retried
|
|
if (is_manual || s.IsShutdownInProgress() ||
|
|
bg_error_.severity() >= Status::Severity::kFatalError) {
|
|
recovery_in_prog_ = false;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
const Status& ErrorHandler::StartRecoverFromRetryableBGIOError(
|
|
const IOStatus& io_error) {
|
|
db_mutex_->AssertHeld();
|
|
if (bg_error_.ok()) {
|
|
return bg_error_;
|
|
} else if (io_error.ok()) {
|
|
return kOkStatus;
|
|
} else if (db_options_.max_bgerror_resume_count <= 0 || recovery_in_prog_) {
|
|
// Auto resume BG error is not enabled, directly return bg_error_.
|
|
return bg_error_;
|
|
}
|
|
if (bg_error_stats_ != nullptr) {
|
|
RecordTick(bg_error_stats_.get(), ERROR_HANDLER_AUTORESUME_COUNT);
|
|
}
|
|
ROCKS_LOG_INFO(
|
|
db_options_.info_log,
|
|
"ErrorHandler: Call StartRecoverFromRetryableBGIOError to resume\n");
|
|
if (recovery_thread_) {
|
|
// In this case, if recovery_in_prog_ is false, current thread should
|
|
// wait the previous recover thread to finish and create a new thread
|
|
// to recover from the bg error.
|
|
db_mutex_->Unlock();
|
|
recovery_thread_->join();
|
|
db_mutex_->Lock();
|
|
}
|
|
|
|
recovery_in_prog_ = true;
|
|
recovery_thread_.reset(
|
|
new port::Thread(&ErrorHandler::RecoverFromRetryableBGIOError, this));
|
|
|
|
if (recovery_io_error_.ok() && recovery_error_.ok()) {
|
|
return recovery_error_;
|
|
} else {
|
|
return bg_error_;
|
|
}
|
|
}
|
|
|
|
// Automatic recover from Retryable BG IO error. Must be called after db
|
|
// mutex is released.
|
|
void ErrorHandler::RecoverFromRetryableBGIOError() {
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeStart");
|
|
InstrumentedMutexLock l(db_mutex_);
|
|
if (end_recovery_) {
|
|
EventHelpers::NotifyOnErrorRecoveryEnd(db_options_.listeners, bg_error_,
|
|
Status::ShutdownInProgress(),
|
|
db_mutex_);
|
|
return;
|
|
}
|
|
DBRecoverContext context = recover_context_;
|
|
int resume_count = db_options_.max_bgerror_resume_count;
|
|
uint64_t wait_interval = db_options_.bgerror_resume_retry_interval;
|
|
uint64_t retry_count = 0;
|
|
// Recover from the retryable error. Create a separate thread to do it.
|
|
while (resume_count > 0) {
|
|
if (end_recovery_) {
|
|
EventHelpers::NotifyOnErrorRecoveryEnd(db_options_.listeners, bg_error_,
|
|
Status::ShutdownInProgress(),
|
|
db_mutex_);
|
|
return;
|
|
}
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeResume0");
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeResume1");
|
|
recovery_io_error_ = IOStatus::OK();
|
|
recovery_error_ = Status::OK();
|
|
retry_count++;
|
|
Status s = db_->ResumeImpl(context);
|
|
if (bg_error_stats_ != nullptr) {
|
|
RecordTick(bg_error_stats_.get(),
|
|
ERROR_HANDLER_AUTORESUME_RETRY_TOTAL_COUNT);
|
|
}
|
|
if (s.IsShutdownInProgress() ||
|
|
bg_error_.severity() >= Status::Severity::kFatalError) {
|
|
// If DB shutdown in progress or the error severity is higher than
|
|
// Hard Error, stop auto resume and returns.
|
|
recovery_in_prog_ = false;
|
|
if (bg_error_stats_ != nullptr) {
|
|
RecordInHistogram(bg_error_stats_.get(),
|
|
ERROR_HANDLER_AUTORESUME_RETRY_COUNT, retry_count);
|
|
}
|
|
EventHelpers::NotifyOnErrorRecoveryEnd(db_options_.listeners, bg_error_,
|
|
bg_error_, db_mutex_);
|
|
return;
|
|
}
|
|
if (!recovery_io_error_.ok() &&
|
|
recovery_error_.severity() <= Status::Severity::kHardError &&
|
|
recovery_io_error_.GetRetryable()) {
|
|
// If new BG IO error happens during auto recovery and it is retryable
|
|
// and its severity is Hard Error or lower, the auto resmue sleep for
|
|
// a period of time and redo auto resume if it is allowed.
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeWait0");
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeWait1");
|
|
int64_t wait_until = db_options_.clock->NowMicros() + wait_interval;
|
|
cv_.TimedWait(wait_until);
|
|
} else {
|
|
// There are three possibility: 1) recover_io_error is set during resume
|
|
// and the error is not retryable, 2) recover is successful, 3) other
|
|
// error happens during resume and cannot be resumed here.
|
|
if (recovery_io_error_.ok() && recovery_error_.ok() && s.ok()) {
|
|
// recover from the retryable IO error and no other BG errors. Clean
|
|
// the bg_error and notify user.
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:RecoverSuccess");
|
|
Status old_bg_error = bg_error_;
|
|
is_db_stopped_.store(false, std::memory_order_release);
|
|
bg_error_ = Status::OK();
|
|
bg_error_.PermitUncheckedError();
|
|
EventHelpers::NotifyOnErrorRecoveryEnd(
|
|
db_options_.listeners, old_bg_error, bg_error_, db_mutex_);
|
|
if (bg_error_stats_ != nullptr) {
|
|
RecordTick(bg_error_stats_.get(),
|
|
ERROR_HANDLER_AUTORESUME_SUCCESS_COUNT);
|
|
RecordInHistogram(bg_error_stats_.get(),
|
|
ERROR_HANDLER_AUTORESUME_RETRY_COUNT, retry_count);
|
|
}
|
|
recovery_in_prog_ = false;
|
|
if (soft_error_no_bg_work_) {
|
|
soft_error_no_bg_work_ = false;
|
|
}
|
|
return;
|
|
} else {
|
|
// In this case: 1) recovery_io_error is more serious or not retryable
|
|
// 2) other Non IO recovery_error happens. The auto recovery stops.
|
|
recovery_in_prog_ = false;
|
|
if (bg_error_stats_ != nullptr) {
|
|
RecordInHistogram(bg_error_stats_.get(),
|
|
ERROR_HANDLER_AUTORESUME_RETRY_COUNT, retry_count);
|
|
}
|
|
EventHelpers::NotifyOnErrorRecoveryEnd(
|
|
db_options_.listeners, bg_error_,
|
|
!recovery_io_error_.ok()
|
|
? recovery_io_error_
|
|
: (!recovery_error_.ok() ? recovery_error_ : s),
|
|
db_mutex_);
|
|
return;
|
|
}
|
|
}
|
|
resume_count--;
|
|
}
|
|
recovery_in_prog_ = false;
|
|
EventHelpers::NotifyOnErrorRecoveryEnd(
|
|
db_options_.listeners, bg_error_,
|
|
Status::Aborted("Exceeded resume retry count"), db_mutex_);
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:LoopOut");
|
|
if (bg_error_stats_ != nullptr) {
|
|
RecordInHistogram(bg_error_stats_.get(),
|
|
ERROR_HANDLER_AUTORESUME_RETRY_COUNT, retry_count);
|
|
}
|
|
return;
|
|
}
|
|
|
|
void ErrorHandler::CheckAndSetRecoveryAndBGError(const Status& bg_err) {
|
|
if (recovery_in_prog_ && recovery_error_.ok()) {
|
|
recovery_error_ = bg_err;
|
|
}
|
|
if (bg_err.severity() > bg_error_.severity()) {
|
|
bg_error_ = bg_err;
|
|
}
|
|
if (bg_error_.severity() >= Status::Severity::kHardError) {
|
|
is_db_stopped_.store(true, std::memory_order_release);
|
|
}
|
|
return;
|
|
}
|
|
|
|
void ErrorHandler::EndAutoRecovery() {
|
|
db_mutex_->AssertHeld();
|
|
if (!end_recovery_) {
|
|
end_recovery_ = true;
|
|
}
|
|
cv_.SignalAll();
|
|
db_mutex_->Unlock();
|
|
if (recovery_thread_) {
|
|
recovery_thread_->join();
|
|
}
|
|
db_mutex_->Lock();
|
|
return;
|
|
}
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|