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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4135) Add method to DFSOutputStream to dump pipeline status
Date Thu, 01 Nov 2012 17:07:13 GMT
Todd Lipcon created HDFS-4135:
---------------------------------

             Summary: Add method to DFSOutputStream to dump pipeline status
                 Key: HDFS-4135
                 URL: https://issues.apache.org/jira/browse/HDFS-4135
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs client
    Affects Versions: 2.0.2-alpha, 3.0.0
            Reporter: Todd Lipcon


Occasionally higher-level apps (like HBase) will detect that an outputstream is acting slower
than usual. It would be nice to be able to log a WARN message which contains the current state
of the pipeline, so that its easier for operators to diagnose why things might be acting up.
I would like to see:
- block ID
- number of acked bytes, number of bytes written to pipeline
- current state of ack queue (how many packets are un-acked)
- datanode IDs of pipeline
- any latency information we could easily collect

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