shenhong created YARN-1062:
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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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