org.apache.ratis.server.raftlog.segmented

Class CacheInvalidationPolicy.CacheInvalidationPolicyDefault

java.lang.Object

org.apache.ratis.server.raftlog.segmented.CacheInvalidationPolicy.CacheInvalidationPolicyDefault

All Implemented Interfaces:

CacheInvalidationPolicy

Enclosing interface:

CacheInvalidationPolicy

public static class CacheInvalidationPolicy.CacheInvalidationPolicyDefault
extends Object
implements CacheInvalidationPolicy

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.ratis.server.raftlog.segmented.CacheInvalidationPolicy

CacheInvalidationPolicy.CacheInvalidationPolicyDefault

Constructor Summary

Constructors

Constructor and Description
CacheInvalidationPolicyDefault()

Method Summary

Modifier and Type	Method and Description
List<LogSegment>	evict(long[] followerNextIndices, long safeEvictIndex, long lastAppliedIndex, org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache.LogSegmentList segments, int maxCachedSegments) Determine which log segments should evict their log entry cache

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheInvalidationPolicyDefault

public CacheInvalidationPolicyDefault()

Method Detail

evict

public List<LogSegment> evict(long[] followerNextIndices,
                              long safeEvictIndex,
                              long lastAppliedIndex,
                              org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache.LogSegmentList segments,
                              int maxCachedSegments)

Description copied from interface: CacheInvalidationPolicy

Determine which log segments should evict their log entry cache

Specified by:

evict in interface CacheInvalidationPolicy

Parameters:

followerNextIndices - the next indices of all the follower peers. Null if the local peer is not a leader.

safeEvictIndex - the index up to which cache can be evicted. This index depends on two factors: 1. the largest index belonging to a closed segment 2. the latest snapshotIndex Logs with endIndex less than the max of these two indices can be evicted.

lastAppliedIndex - the last index that has been applied to state machine

segments - The list of log segments. The segments should be sorted in ascending order according to log index.

maxCachedSegments - the max number of segments with cached log entries

Returns:

the log segments that should evict cache