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https://issues.apache.org/jira/browse/MAPREDUCE-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ravi Gummadi updated MAPREDUCE-4087:
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Resolution: Fixed
Release Note: Fixes the issue of GenerateDistCacheData job slowness.
(was: Fixes the issue of Generate Dist Cache Data generation job slowness.)
Status: Resolved (was: Patch Available)
As this fix improves runtime of GenerateDistCacheData job, adding unit test for
this seems to be not simple. So not adding unit test.
Gridmix unit tests passed on my local machine.
I just committed this to trunk and branch-1.
> [Gridmix] GenerateDistCacheData job of Gridmix can become slow in some cases
> ----------------------------------------------------------------------------
>
> Key: MAPREDUCE-4087
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4087
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Ravi Gummadi
> Assignee: Ravi Gummadi
> Attachments: 4087.patch, 4087.trunk.patch
>
>
> In map() method of GenerateDistCacheData job of Gridmix, val.setSize() is
> done every time based on the bytes to be written to a distributed cache file.
> When we try to write data to next distributed cache file in the same map
> task, the size of random data generated in each iteration can become small
> based on the particular case. This can make this dist cache data generation
> slow.
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