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From "shenhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1062) MRAppMaster take a long time to init taskAttempt
Date Tue, 13 Aug 2013 18:16:50 GMT

    [ https://issues.apache.org/jira/browse/YARN-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13738596#comment-13738596
] 

shenhong commented on YARN-1062:
--------------------------------

Thanks Vinod Kumar Vavilapalli, I think  YARN-435 is okay to me.

                
> MRAppMaster take a long time to init taskAttempt
> ------------------------------------------------
>
>                 Key: YARN-1062
>                 URL: https://issues.apache.org/jira/browse/YARN-1062
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: applications
>    Affects Versions: 0.23.6
>            Reporter: shenhong
>
> In our cluster, MRAppMaster take a long time to init taskAttempt, the following log last
one minute,
> 2013-07-17 11:28:06,328 INFO [AsyncDispatcher event handler] org.apache.hadoop.yarn.util.RackResolver:
Resolved r01f11012.yh.aliyun.com to /r01f11
> 2013-07-17 11:28:06,357 INFO [AsyncDispatcher event handler] org.apache.hadoop.yarn.util.RackResolver:
Resolved r01f11004.yh.aliyun.com to /r01f11
> 2013-07-17 11:28:06,383 INFO [AsyncDispatcher event handler] org.apache.hadoop.yarn.util.RackResolver:
Resolved r03b05042.yh.aliyun.com to /r03b05
> 2013-07-17 11:28:06,384 INFO [AsyncDispatcher event handler] org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl:
attempt_1373523419753_4543_m_000000_0 TaskAttempt Transitioned from NEW to UNASSIGNED
> 2013-07-17 11:28:06,415 INFO [AsyncDispatcher event handler] org.apache.hadoop.yarn.util.RackResolver:
Resolved r03b02006.yh.aliyun.com to /r03b02
> 2013-07-17 11:28:06,436 INFO [AsyncDispatcher event handler] org.apache.hadoop.yarn.util.RackResolver:
Resolved r02f02045.yh.aliyun.com to /r02f02
> 2013-07-17 11:28:06,457 INFO [AsyncDispatcher event handler] org.apache.hadoop.yarn.util.RackResolver:
Resolved r02f02034.yh.aliyun.com to /r02f02
> 2013-07-17 11:28:06,457 INFO [AsyncDispatcher event handler] org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl:
attempt_1373523419753_4543_m_000001_0 TaskAttempt Transitioned from NEW to UNASSIGNED
> The reason is: resolved one host to rack almost take 25ms (We resolve the host to rack
by a python script). Our hdfs cluster is more than 4000 datanodes, then a large input job
will take a long time to init TaskAttempt.
> Is there any good idea to solve this problem. 

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