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From "Nicolas Liochon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10605) Manage the call timeout in the server
Date Mon, 07 Mar 2016 13:51:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15183013#comment-15183013
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Nicolas Liochon commented on HBASE-10605:
-----------------------------------------

> , I think client rpc should include the timeout parameter
Yes, we would need to forward the timeout (not the the submit time, because we don't want
to rely on having the server and client clocks in sync: the server can use its own clock).
Then there is already a check in the server, the request is cancelled if the client is disconnected
(i.e. the tcp connection is closed).

> Manage the call timeout in the server
> -------------------------------------
>
>                 Key: HBASE-10605
>                 URL: https://issues.apache.org/jira/browse/HBASE-10605
>             Project: HBase
>          Issue Type: Improvement
>          Components: IPC/RPC, regionserver
>    Affects Versions: 0.99.0
>            Reporter: Nicolas Liochon
>
> Since HBASE-10566, we have an explicit call timeout available in the client.
> We could forward it to the server, and use this information for:
> - if the call is still in the queue, just cancel it
> - if the call is under execution, makes this information available in RpcCallContext
(actually change the RpcCallContext#disconnectSince to something more generic), so it can
be used by the query under execution to stop its execution
> - in the future, interrupt it to manage the case 'stuck on a dead datanode' or something
similar
> - if the operation has finished, don't send the reply to the client, as by definition
the client is not interested anymore.
> From this, it will be easy to manage the cancellation: disconnect/timeout/cancellation
are similar from a service execution PoV



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