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https://issues.apache.org/jira/browse/HDFS-4942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706406#comment-13706406
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Konstantin Shvachko commented on HDFS-4942:
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Suresh, it looks like the issue is rapidly spreading into multiple jiras. I
counted 8 by now.
If you think it will take more than that should we consider moving this to a
branch?
Otherwise porting of the feature in other branches becomes challenging as
cherry picking of multiple patches interleaved with other changes is
non-trivial.
> Add retry cache support in Namenode
> -----------------------------------
>
> Key: HDFS-4942
> URL: https://issues.apache.org/jira/browse/HDFS-4942
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: ha, namenode
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Attachments: HDFSRetryCache.pdf
>
>
> In current HA mechanism with FailoverProxyProvider and non HA setups with
> RetryProxy retry a request from the RPC layer. If the retried request has
> already been processed at the namenode, the subsequent attempts fail for
> non-idempotent operations such as create, append, delete, rename etc. This
> will cause application failures during HA failover, network issues etc.
> This jira proposes adding retry cache at the namenode to handle these
> failures. More details in the comments.
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