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[Segment Replication] Refactor file cleanup logic and fix PIT/Scroll …
…with remote store. (opensearch-project#9111) * Remove divergent commit logic with segment replication. This change removes divergent commit paths for segrep node-node and remote store. All replicas with segrep enabled will perform local commits and ignore any incoming segments_n file. This changes the recovery sync with remote store to also exclude the segments_n so that only the fetched infos bytes are committed before an engine is opened. This change also updates deletion logic with segment replication to automatically delete when a file is decref'd to 0. Signed-off-by: Marc Handalian <handalm@amazon.com> * Add more NRTReplicationEngineTests. Signed-off-by: Marc Handalian <handalm@amazon.com> * Ensure old commit files are wiped on remote store sync before we commit a new segmentInfos. Signed-off-by: Marc Handalian <handalm@amazon.com> * Add more shard level tests. Signed-off-by: Marc Handalian <handalm@amazon.com> * Add test ensuring commits are cleaned up on replicas. Signed-off-by: Marc Handalian <handalm@amazon.com> * Self review. Signed-off-by: Marc Handalian <handalm@amazon.com> * Use refresh level sync before recovery Signed-off-by: Marc Handalian <handalm@amazon.com> * PR feedback. Signed-off-by: Marc Handalian <handalm@amazon.com> --------- Signed-off-by: Marc Handalian <handalm@amazon.com> Signed-off-by: Shivansh Arora <hishiv@amazon.com>
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server/src/main/java/org/opensearch/index/engine/ReplicaFileTracker.java
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| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
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| package org.opensearch.index.engine; | ||
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| import org.apache.logging.log4j.LogManager; | ||
| import org.apache.logging.log4j.Logger; | ||
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| import java.util.Collection; | ||
| import java.util.HashMap; | ||
| import java.util.HashSet; | ||
| import java.util.Map; | ||
| import java.util.Optional; | ||
| import java.util.Set; | ||
| import java.util.function.BiConsumer; | ||
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| /** | ||
| * This class is heavily influenced by Lucene's ReplicaFileDeleter class used to keep track of | ||
| * segment files that should be preserved on replicas between replication events. | ||
| * | ||
| * https://github.com/apache/lucene/blob/main/lucene/replicator/src/java/org/apache/lucene/replicator/nrt/ReplicaFileDeleter.java | ||
| * | ||
| * @opensearch.internal | ||
| */ | ||
| final class ReplicaFileTracker { | ||
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| public static final Logger logger = LogManager.getLogger(ReplicaFileTracker.class); | ||
| private final Map<String, Integer> refCounts = new HashMap<>(); | ||
| private final BiConsumer<String, String> fileDeleter; | ||
| private final Set<String> EXCLUDE_FILES = Set.of("write.lock"); | ||
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| public ReplicaFileTracker(BiConsumer<String, String> fileDeleter) { | ||
| this.fileDeleter = fileDeleter; | ||
| } | ||
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| public synchronized void incRef(Collection<String> fileNames) { | ||
| for (String fileName : fileNames) { | ||
| refCounts.merge(fileName, 1, Integer::sum); | ||
| } | ||
| } | ||
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| public synchronized int refCount(String file) { | ||
| return Optional.ofNullable(refCounts.get(file)).orElse(0); | ||
| } | ||
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| public synchronized void decRef(Collection<String> fileNames) { | ||
| Set<String> toDelete = new HashSet<>(); | ||
| for (String fileName : fileNames) { | ||
| Integer curCount = refCounts.get(fileName); | ||
| assert curCount != null : "fileName=" + fileName; | ||
| assert curCount > 0; | ||
| if (curCount == 1) { | ||
| refCounts.remove(fileName); | ||
| toDelete.add(fileName); | ||
| } else { | ||
| refCounts.put(fileName, curCount - 1); | ||
| } | ||
| } | ||
| if (toDelete.isEmpty() == false) { | ||
| delete(toDelete); | ||
| } | ||
| } | ||
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| public void deleteUnreferencedFiles(String... toDelete) { | ||
| for (String file : toDelete) { | ||
| if (canDelete(file)) { | ||
| delete(file); | ||
| } | ||
| } | ||
| } | ||
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| private synchronized void delete(Collection<String> toDelete) { | ||
| for (String fileName : toDelete) { | ||
| delete(fileName); | ||
| } | ||
| } | ||
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| private synchronized void delete(String fileName) { | ||
| assert canDelete(fileName); | ||
| fileDeleter.accept("delete unreferenced", fileName); | ||
| } | ||
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| private synchronized boolean canDelete(String fileName) { | ||
| return EXCLUDE_FILES.contains(fileName) == false && refCounts.containsKey(fileName) == false; | ||
| } | ||
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| } |
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