Todd Lipcon created HDFS-4135:
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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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