John Zhuge created HDFS-10822:
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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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