2 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.cluster.raft;
10 import akka.japi.Procedure;
11 import com.google.common.base.Preconditions;
12 import java.util.Collections;
13 import java.util.List;
14 import org.opendaylight.controller.cluster.raft.persisted.DeleteEntries;
17 * Implementation of ReplicatedLog used by the RaftActor.
19 class ReplicatedLogImpl extends AbstractReplicatedLogImpl {
20 private static final int DATA_SIZE_DIVIDER = 5;
22 private final Procedure<DeleteEntries> deleteProcedure = NoopProcedure.instance();
24 private final RaftActorContext context;
25 private long dataSizeSinceLastSnapshot = 0L;
27 private ReplicatedLogImpl(final long snapshotIndex, final long snapshotTerm,
28 final List<ReplicatedLogEntry> unAppliedEntries,
29 final RaftActorContext context) {
30 super(snapshotIndex, snapshotTerm, unAppliedEntries, context.getId());
31 this.context = Preconditions.checkNotNull(context);
34 static ReplicatedLog newInstance(final Snapshot snapshot, final RaftActorContext context) {
35 return new ReplicatedLogImpl(snapshot.getLastAppliedIndex(), snapshot.getLastAppliedTerm(),
36 snapshot.getUnAppliedEntries(), context);
39 static ReplicatedLog newInstance(final RaftActorContext context) {
40 return new ReplicatedLogImpl(-1L, -1L, Collections.<ReplicatedLogEntry>emptyList(), context);
44 public boolean removeFromAndPersist(final long logEntryIndex) {
45 // FIXME: Maybe this should be done after the command is saved
46 long adjustedIndex = removeFrom(logEntryIndex);
47 if (adjustedIndex >= 0) {
48 context.getPersistenceProvider().persist(new DeleteEntries(adjustedIndex), deleteProcedure);
56 public void captureSnapshotIfReady(final ReplicatedLogEntry replicatedLogEntry) {
57 final ConfigParams config = context.getConfigParams();
58 final long journalSize = replicatedLogEntry.getIndex() + 1;
59 final long dataThreshold = context.getTotalMemory() * config.getSnapshotDataThresholdPercentage() / 100;
61 if (journalSize % config.getSnapshotBatchCount() == 0 || getDataSizeForSnapshotCheck() > dataThreshold) {
62 boolean started = context.getSnapshotManager().capture(replicatedLogEntry,
63 context.getCurrentBehavior().getReplicatedToAllIndex());
64 if (started && !context.hasFollowers()) {
65 dataSizeSinceLastSnapshot = 0;
70 private long getDataSizeForSnapshotCheck() {
71 if (!context.hasFollowers()) {
72 // When we do not have followers we do not maintain an in-memory log
73 // due to this the journalSize will never become anything close to the
74 // snapshot batch count. In fact will mostly be 1.
75 // Similarly since the journal's dataSize depends on the entries in the
76 // journal the journal's dataSize will never reach a value close to the
78 // By maintaining the dataSize outside the journal we are tracking essentially
79 // what we have written to the disk however since we no longer are in
80 // need of doing a snapshot just for the sake of freeing up memory we adjust
81 // the real size of data by the DATA_SIZE_DIVIDER so that we do not snapshot as often
82 // as if we were maintaining a real snapshot
83 return dataSizeSinceLastSnapshot / DATA_SIZE_DIVIDER;
90 public void appendAndPersist(final ReplicatedLogEntry replicatedLogEntry) {
91 appendAndPersist(replicatedLogEntry, null);
95 public void appendAndPersist(final ReplicatedLogEntry replicatedLogEntry,
96 final Procedure<ReplicatedLogEntry> callback) {
98 context.getLogger().debug("{}: Append log entry and persist {} ", context.getId(), replicatedLogEntry);
100 // FIXME : By adding the replicated log entry to the in-memory journal we are not truly ensuring durability
102 if (!append(replicatedLogEntry)) {
106 // When persisting events with persist it is guaranteed that the
107 // persistent actor will not receive further commands between the
108 // persist call and the execution(s) of the associated event
109 // handler. This also holds for multiple persist calls in context
110 // of a single command.
111 context.getPersistenceProvider().persist(replicatedLogEntry,
113 context.getLogger().debug("{}: persist complete {}", context.getId(), param);
115 int logEntrySize = param.size();
116 dataSizeSinceLastSnapshot += logEntrySize;
118 if (callback != null) {
119 callback.apply(param);