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https://issues.apache.org/jira/browse/MAPREDUCE-7277?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Badger reopened MAPREDUCE-7277:
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> IndexCache totalMemoryUsed differs from cache contents.
> -------------------------------------------------------
>
> Key: MAPREDUCE-7277
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7277
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Jonathan Turner Eagles
> Assignee: Jonathan Turner Eagles
> Priority: Major
> Fix For: 2.8.6, 3.3.0, 2.9.3, 3.1.4, 3.2.2, 2.10.1, 3.4.0
>
> Attachments: IndexCacheActualSize.png, MAPREDUCE-7277.001.patch,
> MAPREDUCE-7277.002.patch, MAPREDUCE-7277.003.patch,
> MAPREDUCE-7277.004-branch-2.10.patch, MAPREDUCE-7277.004.patch
>
>
> It was observed recently in a nodemanager OOM that the memory was filled with
> SpillRecords. However, the IndexCache was only 15% full (1.5MB used on a 10MB
> configured cache size). In particular was noted that the booking variable
> totalMemoryUsed, was out of sync with the contents of the cache showing 96%
> full, thereby drastically reducing the effectiveness of the cache.
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