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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3469) Do not set watch for most cases in ZKRMStateStore
Date Thu, 09 Apr 2015 15:26:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-3469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14487515#comment-14487515
] 

Hadoop QA commented on YARN-3469:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12724219/YARN-3469.01.patch
  against trunk revision 6495940.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager.

Test results: https://builds.apache.org/job/PreCommit-YARN-Build/7271//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/7271//console

This message is automatically generated.

> Do not set watch for most cases in ZKRMStateStore
> -------------------------------------------------
>
>                 Key: YARN-3469
>                 URL: https://issues.apache.org/jira/browse/YARN-3469
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: Jun Gong
>            Assignee: Jun Gong
>            Priority: Minor
>         Attachments: YARN-3469.01.patch
>
>
> In ZKRMStateStore, most operations(e.g. getDataWithRetries, getDataWithRetries, getDataWithRetries)
set watches on znode. Large watches will cause problem such as [ZOOKEEPER-706: large numbers
of watches can cause session re-establishment to fail|https://issues.apache.org/jira/browse/ZOOKEEPER-706].
 
> Although there is a workaround that setting jute.maxbuffer to a larger value, we need
to adjust this value once there are more app and attempts stored in ZK. And those watches
are useless now. It might be better that do not set watches.



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