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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4182) SecondaryNameNode leaks NameCache entries
Date Mon, 12 Nov 2012 22:17:12 GMT
Todd Lipcon created HDFS-4182:
---------------------------------

             Summary: SecondaryNameNode leaks NameCache entries
                 Key: HDFS-4182
                 URL: https://issues.apache.org/jira/browse/HDFS-4182
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 2.0.2-alpha, 0.23.4, 3.0.0
            Reporter: Todd Lipcon
            Priority: Critical


We recently saw an issue where a 2NN ran out of memory, even though it had a relatively small
fsimage. When we looked at the heap dump, we saw that all of the memory had gone to entries
in the NameCache.

It appears that the NameCache is staying in "initializing" mode forever, and therefore a long
running 2NN leaks entries.

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