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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5974) Scanner retry behavior with RPC timeout on next() seems incorrect
Date Tue, 30 Oct 2012 06:40:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486686#comment-13486686
] 

chunhui shen commented on HBASE-5974:
-------------------------------------

bq.Then again the new call on the new Scanner it wont throw CallSequenceOutOfOrderException
any way, But it can either be successfull or timed out at server
Yes,if it timed out again because this request is too large, in the next retry we will throw
CallSequenceOutOfOrderException , is it so?
                
> Scanner retry behavior with RPC timeout on next() seems incorrect
> -----------------------------------------------------------------
>
>                 Key: HBASE-5974
>                 URL: https://issues.apache.org/jira/browse/HBASE-5974
>             Project: HBase
>          Issue Type: Bug
>          Components: Client, regionserver
>    Affects Versions: 0.90.7, 0.92.1, 0.94.0, 0.96.0
>            Reporter: Todd Lipcon
>            Assignee: Anoop Sam John
>            Priority: Critical
>             Fix For: 0.96.0
>
>         Attachments: 5974_94-V4.patch, 5974_trunk.patch, 5974_trunk-V2.patch, 5974_trunk-V3.patch,
HBASE-5974_0.94.patch, HBASE-5974_94-V2.patch, HBASE-5974_94-V3.patch
>
>
> I'm seeing the following behavior:
> - set RPC timeout to a short value
> - call next() for some batch of rows, big enough so the client times out before the result
is returned
> - the HConnectionManager stuff will retry the next() call to the same server. At this
point, one of two things can happen: 1) the previous next() call will still be processing,
in which case you get a LeaseException, because it was removed from the map during the processing,
or 2) the next() call will succeed but skip the prior batch of rows.

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