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https://issues.apache.org/jira/browse/RATIS-2390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan Andika updated RATIS-2390:
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Description:
Currently, SegmentedRaftLog uses RaftLogBase.lock for all its operations even
those that only operates on certain segments (e.g. purge, appends). It might be
possible to reduce contention by having a unique lock per segment.
For example, operations that need to operate on segments only need to hold read
lock on RaftLogBase.lock (in case top level attributes like commitIndex,
snapshotIndex, etc are updated) and subsequently try to hold SegmentedRaftLog
segment locks. We can implement something like writeLock(TermIndex fromIndex,
TermIndex toIndex) and SegmentedRaftLog should only pick the segments locks for
that range.
was:
Currently, SegmentedRaftLog uses RaftLogBase.lock for all its operations even
those that only operates on certain segments (e.g. purge, appends). It might be
possible to reduce contention by having a unique lock per segment.
For example, operations that need to operate on segments only need to hold read
lock on RaftLogBase.lock and subsequently try to hold SegmentedRaftLog segment
locks. We can implement something like writeLock(TermIndex fromIndex, TermIndex
toIndex) and SegmentedRaftLog should only pick the segments locks for that
range.
> Granular segment lock for SegmentedRaftLog
> ------------------------------------------
>
> Key: RATIS-2390
> URL: https://issues.apache.org/jira/browse/RATIS-2390
> Project: Ratis
> Issue Type: Improvement
> Components: RaftLog, server
> Reporter: Ivan Andika
> Priority: Major
> Labels: performance
>
> Currently, SegmentedRaftLog uses RaftLogBase.lock for all its operations even
> those that only operates on certain segments (e.g. purge, appends). It might
> be possible to reduce contention by having a unique lock per segment.
> For example, operations that need to operate on segments only need to hold
> read lock on RaftLogBase.lock (in case top level attributes like commitIndex,
> snapshotIndex, etc are updated) and subsequently try to hold SegmentedRaftLog
> segment locks. We can implement something like writeLock(TermIndex fromIndex,
> TermIndex toIndex) and SegmentedRaftLog should only pick the segments locks
> for that range.
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