[jira] [Issue Comment Edited] (HBASE-5974) Scanner retry behavior with RPC timeout on next() seems incorrect

["Andrew Purtell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-5974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13273530#comment-13273530 ] 

Andrew Purtell edited comment on HBASE-5974 at 5/11/12 7:28 PM:
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bq. My assertion is that this issue is very rare

We saw the LeaseExceptions frequently, so perhaps not. Critical priority is correct here I think.

                
      was (Author: apurtell):
    bq. My assertion is that this issue is very rare

We see the LeaseExceptions frequently, so perhaps not. Critical priority is correct here I think.
                  
> 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
>            Priority: Critical
>
> 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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