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https://issues.apache.org/jira/browse/HDFS-4182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496584#comment-13496584
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Aaron T. Myers commented on HDFS-4182:
--------------------------------------
Seems fine to me. Alternatively we could just make the 2NN completely disable
the NameCache. I don't think most folks are as concerned with their
checkpointing time as they are concerned with their NN startup time. Either way
is certainly fine though.
> 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
> Priority: Critical
> Attachments: 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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