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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3787) Increment is non-idempotent but client retries RPC
Date Thu, 31 Jan 2013 18:19:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13567897#comment-13567897
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Andrew Purtell commented on HBASE-3787:
---------------------------------------

What we really need as a different model for interaction. A bidirectional event stream between
clients and servers. Clients issue requests. Servers (any server) acknowledges completion.
Implies an async client. 

In the absence of that we can at least give the client an indication the op has been processed
even through a retry as long as the region doesn't move. (Add to my OperationInProgressException
also OperationAlreadyCompletedException.) 

If the region relocates, then we expose some uncertainty to the application by failing any
additional retries. This will be less surprising than current behavior because we won't have
silent application of the same op more than once, but punts to the app which isn't great either.
                
> 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: 0.96.0, 0.94.4
>            Reporter: dhruba borthakur
>            Priority: Critical
>             Fix For: 0.96.0
>
>
> 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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