2 * Copyright (c) 2014 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 javax.annotation.Nonnull;
11 import org.opendaylight.controller.cluster.raft.policy.RaftPolicy;
12 import scala.concurrent.duration.FiniteDuration;
15 * Configuration Parameter interface for configuring the Raft consensus system
18 * Any component using this implementation might want to provide an implementation of
19 * this interface to configure
22 * A default implementation will be used if none is provided.
24 * @author Kamal Rameshan
26 public interface ConfigParams {
28 * Returns the minimum number of entries to be present in the in-memory Raft log for a snapshot to be taken.
30 * @return the minimum number of entries.
32 long getSnapshotBatchCount();
35 * Returns the percentage of total memory used in the in-memory Raft log before a snapshot should be taken.
37 * @return the percentage.
39 int getSnapshotDataThresholdPercentage();
42 * Returns the interval at which a heart beat message should be sent to remote followers.
44 * @return the interval as a FiniteDuration.
46 FiniteDuration getHeartBeatInterval();
49 * Returns the interval after which a new election should be triggered if no leader is available.
51 * @return the interval as a FiniteDuration.
53 FiniteDuration getElectionTimeOutInterval();
56 * Returns the maximum election time variance. The election is scheduled using both the election timeout
59 * @return the election time variance.
61 int getElectionTimeVariance();
64 * Returns the maximum size (in bytes) for the snapshot chunk sent from a Leader.
66 * @return the maximum size (in bytes).
68 int getSnapshotChunkSize();
71 * Returns the maximum number of journal log entries to batch on recovery before applying.
73 * @return the maximum number of journal log entries.
75 int getJournalRecoveryLogBatchSize();
78 * Returns the interval in which the leader needs to check if its isolated.
80 * @return the interval in ms.
82 long getIsolatedCheckIntervalInMillis();
86 * Returns the multiplication factor to be used to determine the shard election timeout. The election timeout
87 * is determined by multiplying the election timeout factor with the heart beat duration.
89 * @return the election timeout factor.
91 long getElectionTimeoutFactor();
95 * Returns the RaftPolicy used to determine certain Raft behaviors.
97 * @return an instance of RaftPolicy, if set, or an instance of the DefaultRaftPolicy.
100 RaftPolicy getRaftPolicy();
103 * Returns the PeerAddressResolver.
105 * @return the PeerAddressResolver instance.
108 PeerAddressResolver getPeerAddressResolver();
111 * Returns the custom RaftPolicy class name.
113 * @return the RaftPolicy class name or null if none set.
115 String getCustomRaftPolicyImplementationClass();