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Posted to hdfs-dev@hadoop.apache.org by "Suresh Srinivas (JIRA)" <ji...@apache.org> on 2013/06/28 23:21:20 UTC
[jira] [Created] (HDFS-4942) Add retry cache support in Namenode
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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