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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-12903) Add IPC Server support for suppressing exceptions by type, suppress 'server too busy' messages
Date Mon, 07 Mar 2016 23:09:40 GMT
Arpit Agarwal created HADOOP-12903:
--------------------------------------

             Summary: Add IPC Server support for suppressing exceptions by type, suppress
'server too busy' messages
                 Key: HADOOP-12903
                 URL: https://issues.apache.org/jira/browse/HADOOP-12903
             Project: Hadoop Common
          Issue Type: Bug
          Components: ipc
    Affects Versions: 2.7.2
            Reporter: Arpit Agarwal
            Assignee: Arpit Agarwal


HADOOP-10597 added support for RPC congestion control by sending retriable 'server too busy'
exceptions to clients. 

However every backoff results in a log message. We've seen these log messages slow down the
NameNode.
{code}
2016-03-07 15:02:23,272 INFO org.apache.hadoop.ipc.Server: Socket Reader #1 for port 8020:
readAndProcess from client 127.0.0.1 threw exception [org.apache.hadoop.ipc.RetriableException:
Server is too busy.]
{code}

We already have a metric that tracks the number of backoff events. This log message adds nothing
useful.



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