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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3787) Increment is non-idempotent but client retries RPC
Date Mon, 08 Jul 2013 17:37:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702160#comment-13702160
] 

Sergey Shelukhin commented on HBASE-3787:
-----------------------------------------

FWIW: this paper (I don't remember where I obtained the pdf frankly, I cannot find it in normal
access) http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5697970&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F5685607%2F5697799%2F05697970.pdf%3Farnumber%3D5697970
relies on well-defined return value for increments, as well as on tables with very large volume
of increments to the same value (transaction ids of various sorts). Granted, HBase is probably
not the best tool for the job in this case...
                
> Increment is non-idempotent but client retries RPC
> --------------------------------------------------
>
>                 Key: HBASE-3787
>                 URL: https://issues.apache.org/jira/browse/HBASE-3787
>             Project: HBase
>          Issue Type: Bug
>          Components: Client
>    Affects Versions: 0.94.4, 0.95.2
>            Reporter: dhruba borthakur
>            Assignee: Sergey Shelukhin
>            Priority: Critical
>             Fix For: 0.95.2
>
>         Attachments: HBASE-3787-partial.patch, HBASE-3787-v0.patch, HBASE-3787-v1.patch,
HBASE-3787-v2.patch, HBASE-3787-v3.patch, HBASE-3787-v4.patch, HBASE-3787-v5.patch, HBASE-3787-v5.patch
>
>
> The HTable.increment() operation is non-idempotent. The client retries the increment
RPC a few times (as specified by configuration) before throwing an error to the application.
This makes it possible that the same increment call be applied twice at the server.
> For increment operations, is it better to use HConnectionManager.getRegionServerWithoutRetries()?
Another  option would be to enhance the IPC module to make the RPC server correctly identify
if the RPC is a retry attempt and handle accordingly.

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