[jira] [Created] (HDFS-16293) Client sleep and hold 'dataqueue' when datanode are condensed

["Yuanxin Zhu (Jira)" <ji...@apache.org>]

Yuanxin Zhu created HDFS-16293:
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             Summary: Client sleep and hold 'dataqueue' when datanode are condensed
                 Key: HDFS-16293
                 URL: https://issues.apache.org/jira/browse/HDFS-16293
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 3.2.2
            Reporter: Yuanxin Zhu


When I open the ECN and use Terasort for testing, datanodes are congested([#https://issues.apache.org/jira/browse/HDFS-8008]). The client enters the sleep state after receiving the ACK for many times, but does not release the 'dataqueue'. The ResponseProcessor thread needs the 'dataqueue' to execute 'ackqueue. getfirst()', so the ResponseProcessor will wait for the client to release the 'dataqueue', which is equivalent to that the ResponseProcessor thread also enters sleep, resulting in ack delay.MapReduce tasks can be delayed by tens of minutes or even hours

 



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