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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7805) Scan of same region processed serially if table has region observer coprocessor
Date Sun, 10 Feb 2013 17:27:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575465#comment-13575465

James Taylor commented on HBASE-7805:

I had compiled against 94.2 - sorry about that. I can't get it to fail either on the latest
0.94, though the test does ensure that the rows are in the block cache, maybe HBASE-7336 fixed
more than Lars thought. Good news. Will do some more testing on Monday and upgrade Phoenix
to run on 0.94.4.

Would be good if HBase had a base impl class that implementors of coprocessors could derive
from to shield (at least partially) interface changes like the one to RegionScanner between
0.94.2 and 0.94.4.
> Scan of same region processed serially if table has region observer coprocessor
> -------------------------------------------------------------------------------
>                 Key: HBASE-7805
>                 URL: https://issues.apache.org/jira/browse/HBASE-7805
>             Project: HBase
>          Issue Type: Bug
>          Components: Coprocessors, Scanners
>    Affects Versions: 0.94.4
>            Reporter: James Taylor
>             Fix For: 0.96.0, 0.94.5
>         Attachments: 7805-trunk.txt, ParallelScanTestCoProc.java, ParallelScanTest.java
> If multiple scans to different parts of the same region are executed in parallel, they
are processed serially if the table has a region observer coprocessor.

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