chunyiyang opened a new pull request, #5951:
URL: https://github.com/apache/hadoop/pull/5951
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### Description of PR
By moving `call.setRpcResponse` after
`call.alignmentContext.receiveResponseState(header)`, it guarantees that router
sends a response to the client only after receiving the latest stateId from the
active namenode with fixes the issue.
### How was this patch tested?
Before this patch, the mapreduce job failed roughly 1 out of 100 runs. After
the deployment of this patch, it didn't fail in total 2000 mapreduce jobs.
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
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