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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4557) Do something better than UnknownScannerException
Date Thu, 18 Oct 2012 23:44:03 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13479486#comment-13479486
] 

stack commented on HBASE-4557:
------------------------------

Yes.  In general scannerid is opaque.  Would be good to return something more informative.
 I see the same issue when we get the TooSlow messages in the log.  Its logging scannerid
which tells us next to nothing.. so some means of logging scannerid plus current row or at
least current region would be of more use.
                
> Do something better than UnknownScannerException
> ------------------------------------------------
>
>                 Key: HBASE-4557
>                 URL: https://issues.apache.org/jira/browse/HBASE-4557
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.4
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.96.0
>
>
> UnknownScannerException is a plague, there's no reason we should not at least try to
create a new scanner. If that fails again, maybe try automatically setting a lower scanner
caching (if possible and with proper loggin) and retry again.

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