fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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345 lines
13 KiB
345 lines
13 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.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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namespace rocksdb {
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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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// 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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// 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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};
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std::map<std::tuple<BackgroundErrorReason, Status::Code, bool>, 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,
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Status::Code::kIOError, true),
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Status::Severity::kFatalError},
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{std::make_tuple(BackgroundErrorReason::kFlush,
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Status::Code::kIOError, 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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};
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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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#ifndef ROCKSDB_LITE
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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 = reinterpret_cast<SstFileManagerImpl*>(
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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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#endif
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}
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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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Status ErrorHandler::SetBGError(const Status& bg_err, BackgroundErrorReason reason) {
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db_mutex_->AssertHeld();
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if (bg_err.ok()) {
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return Status::OK();
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}
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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_ = bg_err;
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}
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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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bool found = false;
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{
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auto entry = ErrorSeverityMap.find(std::make_tuple(reason, bg_err.code(),
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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(std::make_tuple(reason,
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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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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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}
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// Allow some error specific overrides
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if (new_bg_err == Status::NoSpace()) {
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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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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 (bg_error_ == Status::NoSpace()) {
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RecoverFromNoSpace();
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}
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}
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return bg_error_;
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}
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Status ErrorHandler::OverrideNoSpaceError(Status bg_error,
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bool* auto_recovery) {
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#ifndef ROCKSDB_LITE
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if (bg_error.severity() >= Status::Severity::kFatalError) {
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return bg_error;
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}
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if (db_options_.sst_file_manager.get() == nullptr) {
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// We rely on SFM to poll for enough disk space and recover
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*auto_recovery = false;
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return bg_error;
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}
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if (db_options_.allow_2pc &&
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(bg_error.severity() <= Status::Severity::kSoftError)) {
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// Don't know how to recover, as the contents of the current WAL file may
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// be inconsistent, and it may be needed for 2PC. If 2PC is not enabled,
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// we can just flush the memtable and discard the log
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*auto_recovery = false;
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return Status(bg_error, Status::Severity::kFatalError);
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}
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{
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uint64_t free_space;
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if (db_options_.env->GetFreeSpace(db_options_.db_paths[0].path,
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&free_space) == Status::NotSupported()) {
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*auto_recovery = false;
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}
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}
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return bg_error;
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#else
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(void)auto_recovery;
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return Status(bg_error, Status::Severity::kFatalError);
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#endif
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}
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void ErrorHandler::RecoverFromNoSpace() {
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#ifndef ROCKSDB_LITE
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SstFileManagerImpl* sfm =
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reinterpret_cast<SstFileManagerImpl*>(db_options_.sst_file_manager.get());
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// Inform SFM of the error, so it can kick-off the recovery
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if (sfm) {
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sfm->StartErrorRecovery(this, bg_error_);
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}
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#endif
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}
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Status ErrorHandler::ClearBGError() {
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#ifndef ROCKSDB_LITE
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db_mutex_->AssertHeld();
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// Signal that recovery succeeded
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if (recovery_error_.ok()) {
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Status old_bg_error = bg_error_;
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bg_error_ = Status::OK();
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recovery_in_prog_ = false;
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EventHelpers::NotifyOnErrorRecoveryCompleted(db_options_.listeners,
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old_bg_error, db_mutex_);
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}
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return recovery_error_;
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#else
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return bg_error_;
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#endif
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}
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Status ErrorHandler::RecoverFromBGError(bool is_manual) {
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#ifndef ROCKSDB_LITE
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InstrumentedMutexLock l(db_mutex_);
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if (is_manual) {
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// If its a manual recovery and there's a background recovery in progress
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// return busy status
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if (recovery_in_prog_) {
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return Status::Busy();
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}
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recovery_in_prog_ = true;
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}
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if (bg_error_.severity() == Status::Severity::kSoftError) {
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// Simply clear the background error and return
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recovery_error_ = Status::OK();
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return ClearBGError();
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}
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// Reset recovery_error_. We will use this to record any errors that happen
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// during the recovery process. While recovering, the only operations that
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// can generate background errors should be the flush operations
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recovery_error_ = Status::OK();
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Status s = db_->ResumeImpl();
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// For manual recover, shutdown, and fatal error cases, set
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// recovery_in_prog_ to false. For automatic background recovery, leave it
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// as is regardless of success or failure as it will be retried
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if (is_manual || s.IsShutdownInProgress() ||
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bg_error_.severity() >= Status::Severity::kFatalError) {
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recovery_in_prog_ = false;
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}
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return s;
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#else
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(void)is_manual;
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return bg_error_;
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#endif
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}
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}
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