[jira] [Assigned] (HBASE-20056) Performance optimization on MultiTableInputFormatBase#getSplits()

["Yechao Chen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-20056?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yechao Chen reassigned HBASE-20056:
-----------------------------------

    Assignee: Yechao Chen

> 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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