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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3787) Increment is non-idempotent but client retries RPC
Date Tue, 25 Jun 2013 01:38:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13692669#comment-13692669
] 

Enis Soztutar commented on HBASE-3787:
--------------------------------------

bq. Cells can have arbitrary tags. Do we really want them to be part of the sort order of
KeyValues? 
Agreed that we have to think carefully about this. Obviously, we do not want arbitrary tags
to be part of sort order. AFAIK, accumulo's acl's are in sort order. We can have system level
tags that are sortable vs user level tags, or a boolean per tag indicating whether the value
is sortable. 

                
> 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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