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rocksdb/db/error_handler.cc

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// Copyright (c) 2018-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
#include "db/error_handler.h"
#include "db/db_impl.h"
#include "db/event_helpers.h"
#include "util/sst_file_manager_impl.h"
namespace rocksdb {
// Maps to help decide the severity of an error based on the
// BackgroundErrorReason, Code, SubCode and whether db_options.paranoid_checks
// is set or not. There are 3 maps, going from most specific to least specific
// (i.e from all 4 fields in a tuple to only the BackgroundErrorReason and
// paranoid_checks). The less specific map serves as a catch all in case we miss
// a specific error code or subcode.
std::map<std::tuple<BackgroundErrorReason, Status::Code, Status::SubCode, bool>,
Status::Severity>
ErrorSeverityMap = {
// Errors during BG compaction
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, Status::SubCode::kNoSpace,
true),
Status::Severity::kSoftError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, Status::SubCode::kNoSpace,
false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, Status::SubCode::kSpaceLimit,
true),
Status::Severity::kHardError},
// Errors during BG flush
{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
Status::SubCode::kNoSpace, true),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
Status::SubCode::kNoSpace, false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
Status::SubCode::kSpaceLimit, true),
Status::Severity::kHardError},
// Errors during Write
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kIOError, Status::SubCode::kNoSpace,
true),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kIOError, Status::SubCode::kNoSpace,
false),
Status::Severity::kHardError},
};
std::map<std::tuple<BackgroundErrorReason, Status::Code, bool>, Status::Severity>
DefaultErrorSeverityMap = {
// Errors during BG compaction
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kCorruption, true),
Status::Severity::kUnrecoverableError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kCorruption, false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, false),
Status::Severity::kNoError},
// Errors during BG flush
{std::make_tuple(BackgroundErrorReason::kFlush,
Status::Code::kCorruption, true),
Status::Severity::kUnrecoverableError},
{std::make_tuple(BackgroundErrorReason::kFlush,
Status::Code::kCorruption, false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kFlush,
Status::Code::kIOError, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kFlush,
Status::Code::kIOError, false),
Status::Severity::kNoError},
// Errors during Write
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kCorruption, true),
Status::Severity::kUnrecoverableError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kCorruption, false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kIOError, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kIOError, false),
Status::Severity::kNoError},
};
std::map<std::tuple<BackgroundErrorReason, bool>, Status::Severity>
DefaultReasonMap = {
// Errors during BG compaction
{std::make_tuple(BackgroundErrorReason::kCompaction, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kCompaction, false),
Status::Severity::kNoError},
// Errors during BG flush
{std::make_tuple(BackgroundErrorReason::kFlush, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kFlush, false),
Status::Severity::kNoError},
// Errors during Write
{std::make_tuple(BackgroundErrorReason::kWriteCallback, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback, false),
Status::Severity::kFatalError},
// Errors during Memtable update
{std::make_tuple(BackgroundErrorReason::kMemTable, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kMemTable, false),
Status::Severity::kFatalError},
};
void ErrorHandler::CancelErrorRecovery() {
#ifndef ROCKSDB_LITE
db_mutex_->AssertHeld();
// We'll release the lock before calling sfm, so make sure no new
// recovery gets scheduled at that point
auto_recovery_ = false;
SstFileManagerImpl* sfm = reinterpret_cast<SstFileManagerImpl*>(
db_options_.sst_file_manager.get());
if (sfm) {
// This may or may not cancel a pending recovery
db_mutex_->Unlock();
bool cancelled = sfm->CancelErrorRecovery(this);
db_mutex_->Lock();
if (cancelled) {
recovery_in_prog_ = false;
}
}
#endif
}
// This is the main function for looking at an error during a background
// operation and deciding the severity, and error recovery strategy. The high
// level algorithm is as follows -
// 1. Classify the severity of the error based on the ErrorSeverityMap,
// DefaultErrorSeverityMap and DefaultReasonMap defined earlier
// 2. Call a Status code specific override function to adjust the severity
// if needed. The reason for this is our ability to recover may depend on
// the exact options enabled in DBOptions
// 3. Determine if auto recovery is possible. A listener notification callback
// is called, which can disable the auto recovery even if we decide its
// feasible
// 4. For Status::NoSpace() errors, rely on SstFileManagerImpl to control
// the actual recovery. If no sst file manager is specified in DBOptions,
// a default one is allocated during DB::Open(), so there will always be
// one.
// This can also get called as part of a recovery operation. In that case, we
// also track the error seperately in recovery_error_ so we can tell in the
// end whether recovery succeeded or not
Status ErrorHandler::SetBGError(const Status& bg_err, BackgroundErrorReason reason) {
db_mutex_->AssertHeld();
if (bg_err.ok()) {
return Status::OK();
}
// Check if recovery is currently in progress. If it is, we will save this
// error so we can check it at the end to see if recovery succeeded or not
if (recovery_in_prog_ && recovery_error_.ok()) {
recovery_error_ = bg_err;
}
bool paranoid = db_options_.paranoid_checks;
Status::Severity sev = Status::Severity::kFatalError;
Status new_bg_err;
bool found = false;
{
auto entry = ErrorSeverityMap.find(std::make_tuple(reason, bg_err.code(),
bg_err.subcode(), paranoid));
if (entry != ErrorSeverityMap.end()) {
sev = entry->second;
found = true;
}
}
if (!found) {
auto entry = DefaultErrorSeverityMap.find(std::make_tuple(reason,
bg_err.code(), paranoid));
if (entry != DefaultErrorSeverityMap.end()) {
sev = entry->second;
found = true;
}
}
if (!found) {
auto entry = DefaultReasonMap.find(std::make_tuple(reason, paranoid));
if (entry != DefaultReasonMap.end()) {
sev = entry->second;
}
}
new_bg_err = Status(bg_err, sev);
bool auto_recovery = auto_recovery_;
if (new_bg_err.severity() >= Status::Severity::kFatalError && auto_recovery) {
auto_recovery = false;
;
}
// Allow some error specific overrides
if (new_bg_err == Status::NoSpace()) {
new_bg_err = OverrideNoSpaceError(new_bg_err, &auto_recovery);
}
if (!new_bg_err.ok()) {
Status s = new_bg_err;
EventHelpers::NotifyOnBackgroundError(db_options_.listeners, reason, &s,
db_mutex_, &auto_recovery);
if (!s.ok() && (s.severity() > bg_error_.severity())) {
bg_error_ = s;
} else {
// This error is less severe than previously encountered error. Don't
// take any further action
return bg_error_;
}
}
if (auto_recovery) {
recovery_in_prog_ = true;
// Kick-off error specific recovery
if (bg_error_ == Status::NoSpace()) {
RecoverFromNoSpace();
}
}
return bg_error_;
}
Status ErrorHandler::OverrideNoSpaceError(Status bg_error,
bool* auto_recovery) {
#ifndef ROCKSDB_LITE
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;
#else
(void)auto_recovery;
return Status(bg_error, Status::Severity::kFatalError);
#endif
}
void ErrorHandler::RecoverFromNoSpace() {
#ifndef ROCKSDB_LITE
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_);
}
#endif
}
Status ErrorHandler::ClearBGError() {
#ifndef ROCKSDB_LITE
db_mutex_->AssertHeld();
// Signal that recovery succeeded
if (recovery_error_.ok()) {
Status old_bg_error = bg_error_;
bg_error_ = Status::OK();
recovery_in_prog_ = false;
EventHelpers::NotifyOnErrorRecoveryCompleted(db_options_.listeners,
old_bg_error, db_mutex_);
}
return recovery_error_;
#else
return bg_error_;
#endif
}
Status ErrorHandler::RecoverFromBGError(bool is_manual) {
#ifndef ROCKSDB_LITE
InstrumentedMutexLock l(db_mutex_);
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;
}
if (bg_error_.severity() == Status::Severity::kSoftError) {
// 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();
Status s = db_->ResumeImpl();
// 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;
#else
(void)is_manual;
return bg_error_;
#endif
}
}