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Posted to common-issues@hadoop.apache.org by "Maxim Kolesnikov (Jira)" <ji...@apache.org> on 2019/09/24 20:51:00 UTC
[jira] [Commented] (HADOOP-9747) Reduce unnecessary UGI
synchronization
[ https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16937184#comment-16937184 ]
Maxim Kolesnikov commented on HADOOP-9747:
------------------------------------------
Hello [~daryn], [~kihwal],
I see there was a long discussion on backporting this fix to branch-2, but it did never happen.
May I ask why? Were there any major issues preventing backporting? Is there any work left behind, which may be useful to proceed with backporting? From the thread I see that all patches were applied to Hadoop 3 only.
Thank you in advance.
> 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
> Fix For: 3.1.0, 3.0.3
>
> 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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