Harsh J created HDFS-4290:
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Summary: Expose an event listener interface in DFSOutputStreams
for block write pipeline status changes
Key: HDFS-4290
URL: https://issues.apache.org/jira/browse/HDFS-4290
Project: Hadoop HDFS
Issue Type: New Feature
Components: hdfs-client
Affects Versions: 2.0.0-alpha
Reporter: Harsh J
Priority: Minor
I've noticed HBase periodically polls the current status of block replicas for
its HLog files via the API presented by HDFS-826.
It would perhaps be better for such clients if they could register a listener
instead. The listener(s) can be sent an event in case things change in the last
open block (due to DN fall but no replacement found, etc. cases). This would
avoid having a periodic, parallel looped check in such clients and be more
efficient.
Just a thought :)
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