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Posted to mapreduce-dev@hadoop.apache.org by "Jonathan Turner Eagles (Jira)" <ji...@apache.org> on 2020/04/21 21:45:00 UTC

[jira] [Created] (MAPREDUCE-7277) IndexCache totalMemoryUsed differs from cache contents.

Jonathan Turner Eagles created MAPREDUCE-7277:
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             Summary: 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
         Attachments: IndexCacheActualSize.png

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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