Arpit Agarwal created HDFS-9800:
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             Summary: Add option to send BlockStateChange logs to alternate 
async appender
                 Key: HDFS-9800
                 URL: https://issues.apache.org/jira/browse/HDFS-9800
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.8.0
            Reporter: Arpit Agarwal


BlockStateChange logs are usually suppressed in production to avoid the 
performance impact. It is often useful to enable them for troubleshooting but 
the verbosity of the logs slows down the NameNode.

It would be good to have an option to send BlockStateChange logs to an 
alternate async appender to limit the performance impact. There would be no 
change to the default behavior.



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