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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5543) Add a keepalive option for IPC connections
Date Thu, 08 Mar 2012 21:53:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13225566#comment-13225566
] 

stack commented on HBASE-5543:
------------------------------

Yeah, it looks like its inevitable that we'll ask the server to do legitimate stuff that will
take longer than the rpctimeout yet the server is making headway: e.g. the reproducing test
case, though a little artificial, for "HBASE-4890  fix possible NPE in HConnectionManager"
was asking the regionserver to open 3k regions.

If its a task like the above, there should be a facility for telling client we're alive still
or we should just refuse the request because it will take too long (The latter we need to
do toooo -- from Benoiit.  If server is going to take too long servicing a request, so long
the client will be gone by the time its done its work, then refuse the request... don't do
the increment or update that the updating client will not be around to see).
                
> Add a keepalive option for IPC connections
> ------------------------------------------
>
>                 Key: HBASE-5543
>                 URL: https://issues.apache.org/jira/browse/HBASE-5543
>             Project: HBase
>          Issue Type: Improvement
>          Components: client, coprocessors, ipc
>            Reporter: Andrew Purtell
>
> On the user list someone wrote in with a connection failure due to a long running coprocessor:
> {quote}
> On Wed, Mar 7, 2012 at 10:59 PM, raghavendhra rahul wrote:
> 2012-03-08 12:03:09,475 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server Responder,
call execCoprocessor([B@50cb21, getProjection(), rpc version=1, client version=0, methodsFingerPrint=0),
rpc version=1, client version=29, methodsFingerPrint=54742778 from 10.184.17.26:46472: output
error
> 2012-03-08 12:03:09,476 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server handler 7
on 60020 caught: java.nio.channels.ClosedChannelException
> {quote}
> I suggested in response we might consider give our RPC a keepalive option for calls that
may run for a long time (like execCoprocessor).
> LarsH +1ed the idea:
> {quote}
> +1 on "keepalive". It's a shame (especially for long running server code) to do all the
work, just to find out at the end that the client has given up.
> Or maybe there should be a way to cancel an operation if the clients decides it does
not want to wait any longer (PostgreSQL does that for example). Here that would mean the server
would need to check periodically and coprocessors would need to be written to support that
- so maybe that's no-starter.
> {quote}

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