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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15811) Batch Get after batch Put does not fetch all Cells
Date Thu, 12 May 2016 03:12:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281149#comment-15281149
] 

stack commented on HBASE-15811:
-------------------------------

Thanks for the extra set of eyes [~jingcheng.du@intel.com]

I've been working off the tip of branch-1 where read point is an AtomicLong. Was going to
try and fix here first then work backward.

bq. I guess this code is not necessary any more? Or we miss something in somewhere else?

Thinking on it, the Handler is currently running the batch Put in doMiniBatchMutation. It
has to run to the end before it returns and before the client will come back and ask for all
Cells that were just put. Not sure now how client could come back in between sync and mvcc
update. 




> Batch Get after batch Put does not fetch all Cells
> --------------------------------------------------
>
>                 Key: HBASE-15811
>                 URL: https://issues.apache.org/jira/browse/HBASE-15811
>             Project: HBase
>          Issue Type: Bug
>          Components: Client
>    Affects Versions: 1.2.1
>            Reporter: stack
>            Assignee: stack
>         Attachments: Test.java, Test2.java
>
>
> A big batch put followed by a batch get does not always return all Cells put. See attached
test program by Robert Farr that reproduces the issue. It seems to be an issue to do with
a cluster of more than one machine. Running against a single machine does not have the problem
(though the single machine may have many regions). Robert was unable to make his program fail
with a single machine only.
> I reproduced what Robert was seeing running his program. I was also unable to make a
single machine fail. In a batch of 1000 puts, I see one to three Gets fail. I noticed too
that if I wait a second after a fail and then re-get, the Get succeeds.



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