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https://issues.apache.org/jira/browse/HADOOP-6572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834896#action_12834896
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Kan Zhang commented on HADOOP-6572:
-----------------------------------
It's not easy to write a unit test since the bug depends on a race condition
among RPC handler threads. But we have run the same manual tests with the patch
and the errors disappeared.
> RPC responses may be out-of-order with respect to SASL
> ------------------------------------------------------
>
> Key: HADOOP-6572
> URL: https://issues.apache.org/jira/browse/HADOOP-6572
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc, security
> Reporter: Kan Zhang
> Assignee: Kan Zhang
> Attachments: c6572-02.patch
>
>
> SASL enforces its own message ordering. When RPC server sends its responses
> back, response A may be wrapped by SASL before response B but is put on
> response queue after response B. This results in RPC client receiving wrapped
> response B ahead of A. When the received messages are unwrapped by SASL, SASL
> complaints the messages are out of order.
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