Suresh Srinivas created HDFS-4942:
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Summary: 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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