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https://issues.apache.org/jira/browse/HBASE-20056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16379826#comment-16379826
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Yechao Chen commented on HBASE-20056:
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branch 1.3 and later has fixed this, branch 1.2 not, submit a small patch for
branch1.2 ,mind have a look? [[email protected]]
> Performance optimization on MultiTableInputFormatBase#getSplits()
> ------------------------------------------------------------------
>
> Key: HBASE-20056
> URL: https://issues.apache.org/jira/browse/HBASE-20056
> Project: HBase
> Issue Type: Bug
> Components: hbase, mapreduce
> Affects Versions: 1.0.1, 1.3.1, 1.2.6
> Reporter: ShivaKumar SS
> Assignee: Yechao Chen
> Priority: Minor
> Labels: hbase, mapreduce, performance
> Attachments: HBASE-20056-barnch-1.2-v1.patch
>
>
> Currently this method iterates the List of scan objects to get splits and for
> each iteration it opens the HConnection object and closes it, which is heavy.
> It can be optimized such that a single Hconnection can be used to compute all
> the splits of for all the scan objects for their splits computation.
> This optimization will help in reducing the launch time for MR Job.
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