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https://issues.apache.org/jira/browse/HADOOP-7115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12985023#action_12985023
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Allen Wittenauer commented on HADOOP-7115:
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Do we actually know it was getpwuid or some other call? Yahoo uses a lot of
netgroup info--which is not cached by nscd. The other thing is that nscd is
tunable. You might have just needed to bump up the size of the ncsd cache.
Given how previous "caches" have been implemented, I'm extremely hesitant to
see another one implemented. Especially one that would likely require ops to
bring the whole grid down to fix. [It is bad enough we have to bounce the
NN/JT to fix some of these caches.]
> Add a cache for getpwuid_r and getpwgid_r calls
> -----------------------------------------------
>
> Key: HADOOP-7115
> URL: https://issues.apache.org/jira/browse/HADOOP-7115
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.22.0
> Reporter: Arun C Murthy
> Assignee: Devaraj Das
>
> As discussed in HADOOP-6978, a cache helps a lot.
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