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https://issues.apache.org/jira/browse/HBASE-3787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13656519#comment-13656519
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Sergey Shelukhin commented on HBASE-3787:
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I actually just realized that this model doesn't appear to work for normal
region move (and none would, in fact), because there's no WAL replay in that
case.
The more I think about it the more I wonder if we should have separate nonce
WAL with lazy sync for proper solution. It needs only be synced on memstore
flush; if memstore wasn't flushed, the data recovery will happen and nonces
will be picked from regular WAL.
This patch is better than nothing I guess, for errors against single server of
failing server. I will address little feedback remaining on r...
> 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: 0.95.1
>
> 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
>
>
> 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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