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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12761) On region jump ClientScanners should get next row start key instead of a skip.
Date Wed, 31 Dec 2014 00:26:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14261714#comment-14261714
] 

Hudson commented on HBASE-12761:
--------------------------------

FAILURE: Integrated in HBase-TRUNK #5980 (See [https://builds.apache.org/job/HBase-TRUNK/5980/])
HBASE-12761 On region jump ClientScanners should get next row start key instead of a skip.
(stack: rev e5ec14af04069faf1cc4c671e3c721333f7415b2)
* hbase-client/src/main/java/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.java
* hbase-client/src/main/java/org/apache/hadoop/hbase/client/ReversedClientScanner.java
* hbase-client/src/main/java/org/apache/hadoop/hbase/client/ClientScanner.java


> On region jump ClientScanners should get next row start key instead of a skip.
> ------------------------------------------------------------------------------
>
>                 Key: HBASE-12761
>                 URL: https://issues.apache.org/jira/browse/HBASE-12761
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Jurriaan Mous
>            Assignee: Jurriaan Mous
>             Fix For: 2.0.0, 1.1.0
>
>         Attachments: HBASE-12761-v1.patch, HBASE-12761-v2.patch, HBASE-12761.patch
>
>
> While working on async scanner I had some trouble with the extra RPC calls that happen
to let the Scanner advance 1 row so it skips the last already known row. 
> This RPC call can be avoided by letting the start key be the last row with an appended
0. This saves quite some logic from the scanners and improves performance by saving extra
RPC calls.



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