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https://issues.apache.org/jira/browse/HDFS-9956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15197274#comment-15197274
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sanjay kenganahalli vamanna commented on HDFS-9956:
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Allen,
Thanks for replying,The issue in this jira about timeout that causes the
nematode failure. I know you are taking about faster LDAP response using
caching daemon, That may speed up the ldap response but is not related to
timeout(10 sec).
Thanks,
Sanjay
> LDAP PERFORMANCE ISSUE AND FAIL OVER
> ------------------------------------
>
> Key: HDFS-9956
> URL: https://issues.apache.org/jira/browse/HDFS-9956
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: sanjay kenganahalli vamanna
>
> The typical LDAP group name resolution works well under typical scenarios.
> However, we have seen cases where a user is mapped to many groups (in an
> extreme case, a user is mapped to more than 100 groups). The way it's being
> implemented now makes this case super slow resolving groups from
> ActiveDirectory and making the namenode to failover.
> Instead of failover, we can use the
> parameter(ha.zookeeper.session-timeout.ms) in the getgroups method to
> time-out and send the failed response back to the user so that we can prevent
> name node failover.
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