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https://issues.apache.org/jira/browse/HBASE-1672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12735302#action_12735302
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Amandeep Khurana commented on HBASE-1672:
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I had this issue in 0.19. Not facing the problem in 0.20 though.
> Map tasks not local to RS
> -------------------------
>
> Key: HBASE-1672
> URL: https://issues.apache.org/jira/browse/HBASE-1672
> Project: Hadoop HBase
> Issue Type: Bug
> Components: mapred, master, regionserver
> Affects Versions: 0.20.0, 0.19.3
> Environment: DN, TT and RS running on the same nodes.
> Reporter: Amandeep Khurana
> Fix For: 0.20.0, 0.19.4
>
>
> The number of data local map tasks while scanning a table is only about 10%
> of the total map tasks...
> My table had 280 regions and 13M records... The number of map tasks in the
> scan job were equal to the number of regions (280). Only 25 of them were data
> local tasks.
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