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From "James Estes (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12266) Slow Scan can cause dead loop in ClientScanner
Date Wed, 15 Oct 2014 14:20:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14172397#comment-14172397
] 

James Estes commented on HBASE-12266:
-------------------------------------

Thanks for filing.

It looks like that was set to true due to a VERY similar issue https://issues.apache.org/jira/browse/HBASE-7070
so that it would only reset/retry for one rpc call.  In my case though, the "reset/retry only
for one call" doesn't work because it will have a few successful rpc calls after the reset
(the earlier ones are getting a tiny amount of data, and then the super slow rpc happens on
about the 4th rpc).  

Looking a bit further down, there is logic for the UnknownScannerException that will make
sure we're not over the scannerTimeout. Should that logic maybe be used for all exceptions?
Maybe even at the top of the while loop, but I think changing it only in the exception case
would fix my issue...it would stop retrying after 60s (the default for scannerTimeout).

> Slow Scan can cause dead loop in ClientScanner 
> -----------------------------------------------
>
>                 Key: HBASE-12266
>                 URL: https://issues.apache.org/jira/browse/HBASE-12266
>             Project: HBase
>          Issue Type: Bug
>          Components: Scanners
>    Affects Versions: 0.96.0
>            Reporter: Qiang Tian
>            Priority: Minor
>         Attachments: HBASE-12266-master.patch
>
>
> see http://search-hadoop.com/m/DHED45SVsC1.



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