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      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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            • Assignee:
              jzhuge John Zhuge
              Reporter:
              jzhuge John Zhuge
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