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https://issues.apache.org/jira/browse/HBASE-8877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13711027#comment-13711027
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Hudson commented on HBASE-8877:
-------------------------------
FAILURE: Integrated in hbase-0.95-on-hadoop2 #182 (See
[https://builds.apache.org/job/hbase-0.95-on-hadoop2/182/])
HBASE-8877 Reentrant row locks (Dave Latham) (larsh: rev 1504000)
*
/hbase/branches/0.95/hbase-examples/src/main/java/org/apache/hadoop/hbase/coprocessor/example/BulkDeleteEndpoint.java
*
/hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/BaseRegionObserver.java
*
/hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionObserver.java
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/hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
*
/hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
*
/hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionCoprocessorHost.java
*
/hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java
*
/hbase/branches/0.95/hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/SimpleRegionObserver.java
*
/hbase/branches/0.95/hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestAtomicOperation.java
*
/hbase/branches/0.95/hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegion.java
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/hbase/branches/0.95/hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestParallelPut.java
> Reentrant row locks
> -------------------
>
> Key: HBASE-8877
> URL: https://issues.apache.org/jira/browse/HBASE-8877
> Project: HBase
> Issue Type: Bug
> Components: Coprocessors, regionserver
> Reporter: Dave Latham
> Assignee: Dave Latham
> Fix For: 0.98.0, 0.95.2
>
> Attachments: hbase-8877-0.94-microbenchmark.txt,
> HBASE-8877-0.94.patch, HBASE-8877-0.94-v2.patch, HBASE-8877.patch,
> hbase-8877-refCounts-microbenchmarks.txt, HBASE-8877-refCounts.patch,
> HBASE-8877-refCounts-v2.patch, HBASE-8877-refCounts-v3.patch,
> HBASE-8877-refCounts-v4.patch, HBASE-8877-refCounts-v5.patch,
> HBASE-8877-v2.patch, HBASE-8877-v3.patch, hbase-8877-v4-microbenchmark.txt,
> HBASE-8877-v4.patch, HBASE-8877-v5.patch, HBASE-8877-v6.patch,
> HBASE-8877-v7.patch
>
>
> HBASE-8806 revealed performance problems with batch mutations failing to
> reacquire the same row locks. It looks like HBASE-8806 will use a less
> intrusive change for 0.94 to have batch mutations track their own row locks
> and not attempt to reacquire them. Another approach will be to support
> reentrant row locks directly. This allows simplifying a great deal of
> calling code to no longer track and pass around lock ids.
> One affect this change will have is changing the RegionObserver coprocessor's
> methods preBatchMutate and postBatchMutate from taking a
> {{MiniBatchOperationInProgress<Pair<Mutation, Integer>> miniBatchOp}} to
> taking a {{MiniBatchOperationInProgress<Mutation> miniBatchOp}}. I don't
> believe CPs should be relying on these lock ids, but that's a potential
> incompatibility.
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