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From "Nathan Roberts (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11661) GetContentSummary uses excessive amounts of memory
Date Mon, 17 Apr 2017 21:23:42 GMT
Nathan Roberts created HDFS-11661:
-------------------------------------

             Summary: GetContentSummary uses excessive amounts of memory
                 Key: HDFS-11661
                 URL: https://issues.apache.org/jira/browse/HDFS-11661
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.8.0
            Reporter: Nathan Roberts
            Priority: Blocker


ContentSummaryComputationContext::nodeIncluded() is being used to keep track of all INodes
visited during the current content summary calculation. This can be all of the INodes in the
filesystem, making for a VERY large hash table. This simply won't work on large filesystems.


We noticed this after upgrading a namenode with ~100Million filesystem objects was spending
significantly more time in GC. Fortunately this system had some memory breathing room, other
clusters we have will not run with this additional demand on memory.

This was added as part of HDFS-10797 as a way of keeping track of INodes that have already
been accounted for - to avoid double counting.



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