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From "Gregory Chanan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4583) Integrate RWCC with Append and Increment operations
Date Wed, 31 Oct 2012 00:42:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487414#comment-13487414
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Gregory Chanan commented on HBASE-4583:
---------------------------------------

#1
{code}// only remove Puts that concurrent scanners cannot possibly see (readpoint - 1){code}
the "readpoint -1" stuff is out of date I think.

#2 I'm fine with updateColumnValue if it's only used in tests and the tests pass.

#3 I'll file some JIRAs for adding a test for append (similar to your test for increment)
and for doing what you have done here for checkAndPut.  checkAndPut should be simple because
I don't think it upserts.

#4 We may also need to a test to check that append/increment properly wait for all writes
to complete.  Your test, as best as I can tell, checks that the upsert behaves properly with
scanners, but the waiting for all writes to complete is sort of a separate issue.  Something
like what I suggested over in HBASE-7051:
current cell value is 10.  Do a put of 15 and an increment by 1.  Only acceptable answers
are 15 and 16, but without this patch, we can get 11.
Again, this can be handled in a separate JIRA.

#5 I'm fine with this for 0.96.  What do you think about 0.94?  JD makes a good point that
we are far along to have such a big change, but on the other hand, atomic issues are pretty
serious.  Wondering what your thoughts are.  I'd at least want to do some of my own performance
testing before putting it in 0.94.
                
> Integrate RWCC with Append and Increment operations
> ---------------------------------------------------
>
>                 Key: HBASE-4583
>                 URL: https://issues.apache.org/jira/browse/HBASE-4583
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.96.0
>
>         Attachments: 4583-trunk-less-radical.txt, 4583-trunk-less-radical-v2.txt, 4583-trunk-less-radical-v3.txt,
4583-trunk-less-radical-v4.txt, 4583-trunk-less-radical-v5.txt, 4583-trunk-radical.txt, 4583-trunk-radical_v2.txt,
4583-trunk-v3.txt, 4583.txt, 4583-v2.txt, 4583-v3.txt, 4583-v4.txt
>
>
> Currently Increment and Append operations do not work with RWCC and hence a client could
see the results of multiple such operation mixed in the same Get/Scan.
> The semantics might be a bit more interesting here as upsert adds and removes to and
from the memstore.

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