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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7262) Add a hierarchy into the ZKRMStateStore for delegation token znodes to prevent jute buffer overflow
Date Fri, 27 Oct 2017 01:41:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16221568#comment-16221568
] 

Hudson commented on YARN-7262:
------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13142 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/13142/])
YARN-7262. Add a hierarchy into the ZKRMStateStore for delegation token (rkanter: rev b1de78619f3e5e25d6f9d5eaf41925f22d212fb9)
* (edit) hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/RMStateStore.java
* (edit) hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
* (edit) hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/ZKRMStateStore.java
* (edit) hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/TestZKRMStateStore.java
* (edit) hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java


> Add a hierarchy into the ZKRMStateStore for delegation token znodes to prevent jute buffer
overflow
> ---------------------------------------------------------------------------------------------------
>
>                 Key: YARN-7262
>                 URL: https://issues.apache.org/jira/browse/YARN-7262
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: Robert Kanter
>            Assignee: Robert Kanter
>             Fix For: 2.9.0, 3.0.0
>
>         Attachments: YARN-7262.001.patch, YARN-7262.002.patch, YARN-7262.003.patch, YARN-7262.003.patch
>
>
> We've seen users who are running into a problem where the RM is storing so many delegation
tokens in the {{ZKRMStateStore}} that the _listing_ of those znodes is higher than the jute
buffer. This is fine during operations, but becomes a problem on a fail over because the RM
will try to read in all of the token znodes (i.e. call {{getChildren}} on the parent znode).
 This is particularly bad because everything appears to be okay, but then if a failover occurs
you end up with no active RMs.
> There was a similar problem with the Yarn application data that was fixed in YARN-2962
by adding a (configurable) hierarchy of znodes so the RM could pull subchildren without overflowing
the jute buffer (though it's off by default).
> We should add a hierarchy similar to that of YARN-2962, but for the delegation token
znodes.



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