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Posted to hdfs-dev@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2015/05/04 19:50:13 UTC

[jira] [Created] (HDFS-8315) Datanode does not log reads

Kihwal Lee created HDFS-8315:
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             Summary: Datanode does not log reads
                 Key: HDFS-8315
                 URL: https://issues.apache.org/jira/browse/HDFS-8315
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Kihwal Lee
            Priority: Critical


HDFS-6836 made datanode read request logging DEBUG.  There is a good reason why it was at INFO for so many years.  This is very useful in debugging load issues. This jira will revert HDFS-6836.

We haven't seen it being a bottleneck on busy hbase clusters, but if someone thinks it is a serious overhead, please make it configurable in a separate jira.



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