[jira] [Created] (HDFS-10963) Reduce log level when network topology cannot find enough datanodes.

["Xiao Chen (JIRA)" <ji...@apache.org>]

Xiao Chen created HDFS-10963:
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             Summary: Reduce log level when network topology cannot find enough datanodes.
                 Key: HDFS-10963
                 URL: https://issues.apache.org/jira/browse/HDFS-10963
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Xiao Chen
            Assignee: Xiao Chen
            Priority: Minor
         Attachments: HDFS-10963.01.patch

Credit to [~qwertymaniac] who reported this.
{quote}
The change made by HDFS-10320 now causes all 1-rack cluster to keep printing below:
  WARN	org.apache.hadoop.net.NetworkTopology	
  Failed to find datanode (scope="" excludedScope="/default").
{quote}

This was added in HDFS-10320 to replace an exception that caused NN terminate. A warn log was added. But thinking closely, this should be debug to reduce confusion.



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