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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1672) Map tasks not local to RS
Date Fri, 24 Jul 2009 23:33:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12735207#action_12735207
] 

Jonathan Gray commented on HBASE-1672:
--------------------------------------

Thank you for researching, stack.

Next week we'll have a ton of MR running on trunk so will report if we find anything strange.

> 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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