Bharat Viswanadham commented on HADOOP-9747:

Hi [~daryn]

Thanks for the updated patch.

I am +1 on the latest patch V04.


I have one question in general, this is an already existing issue, if multiple 
threads try to call getLoginUser() (And system properties

KRB5CCNAME is set), so each thread tries to spawn Auto renewal thread here. So, 
is it required for renew for each thread?

> Reduce unnecessary UGI synchronization
> --------------------------------------
>                 Key: HADOOP-9747
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9747
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0-alpha1
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HADOOP-9747-trunk-03.patch, HADOOP-9747-trunk-04.patch, 
> HADOOP-9747-trunk.01.patch, HADOOP-9747-trunk.02.patch, 
> HADOOP-9747.2.branch-2.patch, HADOOP-9747.2.trunk.patch, 
> HADOOP-9747.branch-2.patch, HADOOP-9747.trunk.patch
> Jstacks of heavily loaded NNs show up to dozens of threads blocking in the 
> UGI.

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