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Posted to yarn-dev@hadoop.apache.org by "shenhong (JIRA)" <ji...@apache.org> on 2013/08/13 20:18:48 UTC
[jira] [Resolved] (YARN-1062) MRAppMaster take a long time to init
taskAttempt
[ https://issues.apache.org/jira/browse/YARN-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
shenhong resolved YARN-1062.
----------------------------
Resolution: Duplicate
> 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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