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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-1672) Map tasks not local to RS
Date Fri, 24 Jul 2009 22:07:14 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1672?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack resolved HBASE-1672.
--------------------------

    Resolution: Cannot Reproduce

I ran a rowcounter job against a 100 region table of ~20M rows.  Cluster was small (4 regionservers).
 Tasktrackers ran beside the RS.  Every task was scheduled on the TT that was local to the
RS ("Input Split Locations" always had same value as "Machine" in the taskdetails page).

> 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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