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https://issues.apache.org/jira/browse/HDFS-4942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13696376#comment-13696376
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Bikas Saha commented on HDFS-4942:
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Suresh, you mean non-idempotent requests like create etc in the description and
point 1 in your comment?
> 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
>
> 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
> 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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