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From "Phil Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15325) ResultScanner allowing partial result will reset to the start of the row if the region is moved between two rpc requests
Date Thu, 25 Feb 2016 06:46:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15166821#comment-15166821
] 

Phil Yang commented on HBASE-15325:
-----------------------------------

NotServingRegionException extends IOException so it is not DoNotRetryIOException. And I am
not sure if this exception will be thrown to ClientScanner, may be handled in a lower level?

> ResultScanner allowing partial result will reset to the start of the row if the region
is moved between two rpc requests
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-15325
>                 URL: https://issues.apache.org/jira/browse/HBASE-15325
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.1.3
>            Reporter: Phil Yang
>            Assignee: Phil Yang
>            Priority: Critical
>         Attachments: 15325-test.txt
>
>
> HBASE-11544 allow scan rpc return partial of a row to reduce memory usage for one rpc
request. And client can setAllowPartial or setBatch to get several cells in a row instead
of the whole row.
> However, the status of the scanner is saved on server and we need this to get the next
part if there is a partial result before. If we move the region to another RS, client will
get a NotServingRegionException and open a new scanner to the new RS which will be regarded
as a new scan from the start of this row. So we will see the cells which have been seen before.



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