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From "shenhong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-1062) MRAppMaster take a long time to init taskAttempt
Date Tue, 13 Aug 2013 15:15:49 GMT
shenhong created YARN-1062:
------------------------------

             Summary: 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

The reason is: resolved one host to rack almost take 25ms, 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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