Package org.elasticsearch.index.engine

Class NoOpEngine

java.lang.Object

org.elasticsearch.index.engine.Engine

org.elasticsearch.index.engine.ReadOnlyEngine

org.elasticsearch.index.engine.NoOpEngine

All Implemented Interfaces:

Closeable, AutoCloseable

public final class NoOpEngine
extends ReadOnlyEngine

NoOpEngine is an engine implementation that does nothing but the bare minimum required in order to have an engine. All attempts to do something (search, index, get), throw UnsupportedOperationException. However, NoOpEngine allows to trim any existing translog files through the usage of the {trimUnreferencedTranslogFiles()} method.

Nested Class Summary

Nested classes/interfaces inherited from class org.elasticsearch.index.engine.Engine

Engine.CommitId, Engine.Delete, Engine.DeleteResult, Engine.EventListener, Engine.Get, Engine.GetResult, Engine.HistorySource, Engine.Index, Engine.IndexCommitRef, Engine.IndexResult, Engine.IndexThrottle, Engine.NoOp, Engine.NoOpLock, Engine.NoOpResult, Engine.Operation, Engine.Result, Engine.Searcher, Engine.SearcherScope, Engine.SearcherSupplier, Engine.SyncedFlushResult, Engine.TranslogRecoveryRunner, Engine.Warmer

Field Summary

Fields inherited from class org.elasticsearch.index.engine.ReadOnlyEngine

FIELD_RANGE_SEARCH_SOURCE, translogStats

Fields inherited from class org.elasticsearch.index.engine.Engine

CAN_MATCH_SEARCH_SOURCE, DOC_STATS_SOURCE, engineConfig, eventListener, failedEngine, failEngineLock, FORCE_MERGE_UUID_KEY, HISTORY_UUID_KEY, isClosed, lastWriteNanos, logger, MAX_UNSAFE_AUTO_ID_TIMESTAMP_COMMIT_ID, MIN_RETAINED_SEQNO, readLock, rwl, SEARCH_SOURCE, shardId, store, SYNC_COMMIT_ID, writeLock

Constructor Summary

Constructors

Constructor	Description
NoOpEngine(EngineConfig config)

Method Summary

Modifier and Type	Method	Description
DocsStats	docStats()	Returns the DocsStats for this engine
protected org.apache.lucene.index.DirectoryReader	open(org.apache.lucene.index.IndexCommit commit)
SegmentsStats	segmentsStats(boolean includeSegmentFileSizes, boolean includeUnloadedSegments)	Global stats on segments.
void	trimUnreferencedTranslogFiles()	This implementation will trim existing translog files using a TranslogDeletionPolicy that retains nothing but the last translog generation from safe commit.

Methods inherited from class org.elasticsearch.index.engine.ReadOnlyEngine

acquireHistoryRetentionLock, acquireLastIndexCommit, acquireSafeIndexCommit, acquireSearcherSupplier, activateThrottling, advanceMaxSeqNoOfUpdatesOrDeletes, assertMaxSeqNoEqualsToGlobalCheckpoint, closeNoLock, completionStats, deactivateThrottling, delete, ensureMaxSeqNoEqualsToGlobalCheckpoint, ensureTranslogSynced, estimateNumberOfHistoryOperations, fillSeqNoGaps, flush, forceMerge, get, getCommitId, getHistoryUUID, getIndexBufferRAMBytesUsed, getIndexThrottleTimeInMillis, getLastCommittedSegmentInfos, getLastSyncedGlobalCheckpoint, getMaxSeqNoOfUpdatesOrDeletes, getMinRetainedSeqNo, getPersistedLocalCheckpoint, getRawFieldRange, getReferenceManager, getSafeCommitInfo, getSeqNoStats, getTranslogLastWriteLocation, getTranslogStats, getWritingBytes, hasCompleteOperationHistory, index, isThrottled, isTranslogSyncNeeded, maybePruneDeletes, maybeRefresh, newChangesSnapshot, noOp, openDirectory, processReader, readHistoryOperations, recoverFromTranslog, refresh, refreshNeeded, restoreLocalHistoryFromTranslog, rollTranslogGeneration, segments, shouldPeriodicallyFlush, shouldRollTranslogGeneration, skipTranslogRecovery, syncFlush, syncTranslog, trimOperationsFromTranslog, updateMaxUnsafeAutoIdTimestamp, verifyEngineBeforeIndexClosing, wrapReader, writeIndexingBuffer

Methods inherited from class org.elasticsearch.index.engine.Engine

acquireIndexCommitForSnapshot, acquireSearcher, acquireSearcher, acquireSearcher, acquireSearcherSupplier, close, commitStats, config, docsStats, ensureOpen, ensureOpen, failEngine, fillSegmentStats, flush, flushAndClose, getEngineConfig, getFromSearcher, getLastWriteNanos, getMaxSeenAutoIdTimestamp, getMergeStats, guardedRamBytesUsed, maybeFailEngine, onSettingsChanged, writerSegmentStats

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NoOpEngine

public NoOpEngine(EngineConfig config)

Method Details

open

protected org.apache.lucene.index.DirectoryReader open(org.apache.lucene.index.IndexCommit commit)
                                                throws IOException

Overrides:

open in class ReadOnlyEngine

Throws:

IOException

segmentsStats

public SegmentsStats segmentsStats(boolean includeSegmentFileSizes,
 boolean includeUnloadedSegments)

Description copied from class: Engine

Global stats on segments.

Overrides:

segmentsStats in class Engine

docStats

public DocsStats docStats()

Description copied from class: Engine

Returns the DocsStats for this engine

Overrides:

docStats in class Engine

trimUnreferencedTranslogFiles

public void trimUnreferencedTranslogFiles()

This implementation will trim existing translog files using a TranslogDeletionPolicy that retains nothing but the last translog generation from safe commit.

Overrides:

trimUnreferencedTranslogFiles in class ReadOnlyEngine