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https://issues.apache.org/jira/browse/HDFS-4290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved HDFS-4290.
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Resolution: Later
Specific problems/use-cases driving this need haven't been bought up in the
past years. Resolving as Later for now.
> 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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