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https://issues.apache.org/jira/browse/HADOOP-10300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhe Zhang reopened HADOOP-10300:
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I think this'd be a good addition to branch-2.7; all other subtasks under the
umbrella JIRA are actually in 2.3. Attaching a branch-2.7 patch to trigger
Jenkins.
[~daryn] [~kihwal] LMK if you have any concerns about the backport.
> Allowed deferred sending of call responses
> ------------------------------------------
>
> Key: HADOOP-10300
> URL: https://issues.apache.org/jira/browse/HADOOP-10300
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: ipc
> Affects Versions: 2.0.0-alpha, 3.0.0-alpha1
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Labels: BB2015-05-TBR
> Fix For: 2.8.0, 3.0.0-alpha1
>
> Attachments: HADOOP-10300-branch-2.7.0.patch, HADOOP-10300.patch,
> HADOOP-10300.patch, HADOOP-10300.patch
>
>
> RPC handlers currently do not return until the RPC call completes and
> response is sent, or a partially sent response has been queued for the
> responder. It would be useful for a proxy method to notify the handler to
> not yet the send the call's response.
> An potential use case is a namespace handler in the NN might want to return
> before the edit log is synced so it can service more requests and allow
> increased batching of edits per sync. Background syncing could later trigger
> the sending of the call response to the client.
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