Ming Ma created HADOOP-10125:
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Summary: no need to process RPC request if the client connection
has been dropped
Key: HADOOP-10125
URL: https://issues.apache.org/jira/browse/HADOOP-10125
Project: Hadoop Common
Issue Type: Bug
Reporter: Ming Ma
If the client has dropped the connection before the RPC is processed, RPC
server doesn't need to process the RPC call. We have encountered issues where
bad applications can bring down the NN.
https://issues.apache.org/jira/i#browse/Hadoop-9640 tries to address that. When
this occurs, NN's RPC queues are filled up with client requests and DN
requests, sometimes we want to stop the flooding by stopping the bad
applications and/or DNs. Some RPC processing like DatanodeProtocol::blockReport
could take couple hundred milliseconds. So it is worthwhile to have NN skip the
RPC calls if DNs have been stopped.
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