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Posted to common-issues@hadoop.apache.org by "Arpit Agarwal (JIRA)" <ji...@apache.org> on 2016/03/08 00:09:40 UTC

[jira] [Created] (HADOOP-12903) Add IPC Server support for suppressing exceptions by type, suppress 'server too busy' messages

Arpit Agarwal created HADOOP-12903:
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             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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