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From "John Zhuge (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10822) Log DataNodes in the write pipeline
Date Wed, 31 Aug 2016 19:21:22 GMT
John Zhuge created HDFS-10822:

             Summary: Log DataNodes in the write pipeline
                 Key: HDFS-10822
                 URL: https://issues.apache.org/jira/browse/HDFS-10822
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs-client
    Affects Versions: 2.6.0
            Reporter: John Zhuge
            Assignee: John Zhuge
            Priority: Trivial

Trying to diagnose a slow HDFS flush, taking longer than 10 seconds, but did not know which
DNs were involved in the write pipeline. Of course, I could search NN log for the list of
DNs, but it might not be possible sometimes or convenient.

Propose to add a DEBUG trace to DataStreamer#setPipeline to print the list of DNs in the pipeline.

BTW, we do print the list of DNs during pipeline recovery.

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