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https://issues.apache.org/jira/browse/HDFS-4182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497498#comment-13497498
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Daryn Sharp commented on HDFS-4182:
-----------------------------------
+1 I think it looks ok relative to the trunk patch. It seems like the image
load notification shouldn't have to be duplicated in different places in the NN
and 2NN, ie. pushed down lower, but given the current design I don't think
that's possible.
> 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: 0.23.4, 3.0.0, 2.0.2-alpha
> Reporter: Todd Lipcon
> Assignee: Robert Joseph Evans
> Priority: Critical
> Attachments: HDFS-4182-branch-0.23.txt, HDFS-4182.txt, HDFS-4182.txt,
> HDFS-4182.txt, HDFS-4182.txt
>
>
> 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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