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https://issues.apache.org/jira/browse/HBASE-17387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu updated HBASE-17387:
---------------------------
Fix Version/s: 1.3.1
> Reduce the overhead of exception report in RegionActionResult for multi()
> -------------------------------------------------------------------------
>
> Key: HBASE-17387
> URL: https://issues.apache.org/jira/browse/HBASE-17387
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: Ted Yu
> Priority: Minor
> Fix For: 2.0.0, 1.4.0, 1.3.1
>
> Attachments: 17387.v1.txt, 17387.v2.txt, 17387.v3.txt
>
>
> For RSRpcServices#doNonAtomicRegionMutation() :
> {code}
> for (ClientProtos.Action action: actions.getActionList()) {
> ...
> } catch (IOException ie) {
> rpcServer.getMetrics().exception(ie);
> resultOrExceptionBuilder = ResultOrException.newBuilder().
> setException(ResponseConverter.buildException(ie));
> }
> if (resultOrExceptionBuilder != null) {
> // Propagate index.
> resultOrExceptionBuilder.setIndex(action.getIndex());
> builder.addResultOrException(resultOrExceptionBuilder.build());
> }
> {code}
> The exceptions are added to builder in the for loop.
> The ClientProtos.ResultOrException.Builder instance is created within the for
> loop.
> For large multi call, this may incur non-trivial overhead for garbage
> collector if there're many exceptions.
> e.g. Here was sample debug log showing the actions in a batch:
> {code}
> 2016-12-23 04:21:56,263 DEBUG
> org.apache.hadoop.hbase.regionserver.RSRpcServices: NonAtomicRegionMutation
> batch summary: numAppends=0, numDeletes=11, numGets=0, numIncrements=15638,
> numPuts=15627, numServiceCalls=0, serializedSize=3871713,
> user=hbase/pob3.G.COM (auth:KERBEROS), client=null
> {code}
> Note the large number of increments in the batch.
> When the increments encounter conflict at server side, the overhead of
> stringified exceptions in response is considerable.
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