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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-13613) RegionServer log is flooded with "Execution rejected, Executing in current thread"
Date Wed, 23 May 2018 23:03:00 GMT
Wei-Chiu Chuang created HDFS-13613:
--------------------------------------

             Summary: RegionServer log is flooded with "Execution rejected, Executing in current
thread"
                 Key: HDFS-13613
                 URL: https://issues.apache.org/jira/browse/HDFS-13613
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.4.0
         Environment: CDH 5.13, HBase RegionServer, Kerberized, hedged read
            Reporter: Wei-Chiu Chuang


In the log of a HBase RegionServer with hedged read, we saw the following message flooding
the log file.
{noformat}
2018-05-19 17:22:55,691 INFO org.apache.hadoop.hdfs.DFSClient: Execution rejected, Executing
in current thread
2018-05-19 17:22:55,692 INFO org.apache.hadoop.hdfs.DFSClient: Execution rejected, Executing
in current thread
2018-05-19 17:22:55,695 INFO org.apache.hadoop.hdfs.DFSClient: Execution rejected, Executing
in current thread
2018-05-19 17:22:55,696 INFO org.apache.hadoop.hdfs.DFSClient: Execution rejected, Executing
in current thread
2018-05-19 17:22:55,696 INFO org.apache.hadoop.hdfs.DFSClient: Execution rejected, Executing
in current thread
....
{noformat}
Sometimes the RS spits tens of thousands of lines of this message in a minute. We should do
something to stop this message flooding the log file. Also, we should make this message more
actionable. Discussed with [~huaxiang], this message can appear if there are stale DataNodes.

I believe this issue existed since HDFS-5776.



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