a10f12eda1
Summary: In current codebase, in write path, if Retryable IO Error happens, SetBGError is called. The retryable IO Error is converted to hard error and DB is in read only mode. User or application needs to resume it. In this PR, if Retryable IO Error happens in one DB, SetBGError will create a new thread to call Resume (auto resume). otpions.max_bgerror_resume_count controls if auto resume is enabled or not (if max_bgerror_resume_count<=0, auto resume will not be enabled). options.bgerror_resume_retry_interval controls the time interval to call Resume again if the previous resume fails due to the Retryable IO Error. If non-retryable error happens during resume, auto resume will terminate. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6765 Test Plan: Added the unit test cases in error_handler_fs_test and pass make asan_check Reviewed By: anand1976 Differential Revision: D21916789 Pulled By: zhichao-cao fbshipit-source-id: acb8b5e5dc3167adfa9425a5b7fc104f6b95cb0b
544 lines
20 KiB
C++
544 lines
20 KiB
C++
// 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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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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// 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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// 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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};
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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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};
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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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// 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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#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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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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// 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 == 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::SetBGError(const IOStatus& bg_io_err,
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BackgroundErrorReason reason) {
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db_mutex_->AssertHeld();
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if (bg_io_err.ok()) {
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return Status::OK();
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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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// Always returns ok
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db_->DisableFileDeletionsWithLock();
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}
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Status new_bg_io_err = bg_io_err;
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Status s;
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if (bg_io_err.GetDataLoss()) {
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// FIrst, data loss is treated as unrecoverable error. So it can directly
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// 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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bg_error_ = bg_err;
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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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EventHelpers::NotifyOnBackgroundError(db_options_.listeners, reason, &s,
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db_mutex_, &auto_recovery);
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return bg_error_;
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} else if (bg_io_err.GetRetryable()) {
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// Second, check if the error is a retryable IO error or not. if it is
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// retryable error and its severity is higher than bg_error_, overwrite
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// the bg_error_ with new error.
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// In current stage, for retryable IO error of compaction, treat it as
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// soft error. In other cases, treat the retryable IO error as hard
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// error.
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bool auto_recovery = false;
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EventHelpers::NotifyOnBackgroundError(db_options_.listeners, reason, &s,
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db_mutex_, &auto_recovery);
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if (BackgroundErrorReason::kCompaction == reason) {
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Status bg_err(new_bg_io_err, Status::Severity::kSoftError);
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if (bg_err.severity() > bg_error_.severity()) {
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bg_error_ = bg_err;
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}
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return bg_error_;
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} else {
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Status bg_err(new_bg_io_err, Status::Severity::kHardError);
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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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if (bg_err.severity() > bg_error_.severity()) {
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bg_error_ = bg_err;
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}
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return StartRecoverFromRetryableBGIOError(bg_io_err);
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}
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} else {
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s = SetBGError(new_bg_io_err, reason);
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}
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return s;
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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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Status ErrorHandler::StartRecoverFromRetryableBGIOError(IOStatus io_error) {
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#ifndef ROCKSDB_LITE
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db_mutex_->AssertHeld();
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if (bg_error_.ok() || io_error.ok()) {
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return Status::OK();
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}
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if (db_options_.max_bgerror_resume_count <= 0 || recovery_in_prog_ ||
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recovery_thread_) {
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// Auto resume BG error is not enabled, directly return bg_error_.
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return bg_error_;
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}
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recovery_in_prog_ = true;
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recovery_thread_.reset(
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new port::Thread(&ErrorHandler::RecoverFromRetryableBGIOError, this));
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if (recovery_io_error_.ok() && recovery_error_.ok()) {
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return Status::OK();
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} else {
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TEST_SYNC_POINT("StartRecoverRetryableBGIOError:RecoverFail");
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return bg_error_;
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}
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#else
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(void)io_error;
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return bg_error_;
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#endif
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}
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// Automatic recover from Retryable BG IO error. Must be called after db
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// mutex is released.
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void ErrorHandler::RecoverFromRetryableBGIOError() {
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#ifndef ROCKSDB_LITE
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TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeStart");
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeStart1");
|
|
InstrumentedMutexLock l(db_mutex_);
|
|
if (end_recovery_) {
|
|
return;
|
|
}
|
|
int resume_count = db_options_.max_bgerror_resume_count;
|
|
uint64_t wait_interval = db_options_.bgerror_resume_retry_interval;
|
|
// Recover from the retryable error. Create a separate thread to do it.
|
|
while (resume_count > 0) {
|
|
if (end_recovery_) {
|
|
return;
|
|
}
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeResume0");
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeResume1");
|
|
recovery_io_error_ = IOStatus::OK();
|
|
recovery_error_ = Status::OK();
|
|
Status s = db_->ResumeImpl();
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:AfterResume0");
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:AfterResume1");
|
|
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.
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:RecoverFail0");
|
|
recovery_in_prog_ = false;
|
|
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_->env_->NowMicros() + wait_interval;
|
|
cv_.TimedWait(wait_until);
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:AfterWait0");
|
|
} 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_;
|
|
bg_error_ = Status::OK();
|
|
EventHelpers::NotifyOnErrorRecoveryCompleted(db_options_.listeners,
|
|
old_bg_error, db_mutex_);
|
|
recovery_in_prog_ = false;
|
|
return;
|
|
} else {
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:RecoverFail1");
|
|
// 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;
|
|
return;
|
|
}
|
|
}
|
|
resume_count--;
|
|
}
|
|
recovery_in_prog_ = false;
|
|
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:LoopOut");
|
|
return;
|
|
#else
|
|
return;
|
|
#endif
|
|
}
|
|
|
|
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
|