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Posted to hdfs-dev@hadoop.apache.org by "Suresh Srinivas (JIRA)" <ji...@apache.org> on 2013/06/06 23:30:21 UTC

[jira] [Created] (HDFS-4892) Number of transceivers reported by the datanode is incorrect

Suresh Srinivas created HDFS-4892:
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             Summary: Number of transceivers reported by the datanode is incorrect
                 Key: HDFS-4892
                 URL: https://issues.apache.org/jira/browse/HDFS-4892
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.0.0-alpha
            Reporter: Suresh Srinivas


Currently a datanode reports the transceiver count to namenode. Namenode aggregates this as TotalLoad metrics and is used for monitoring cluster activity. It is also used for making block placement decision, to qualify if a datanode is a good target.

Currently transceiver count is = 1 (for XceiverServer) + 1 * (number of readers) + 2 * (Number of writers in pipeline) + 1 * (number of datanode replications) + 1 * (number of recover blocks)

Should the number of transceiver just reflect number of readers + writers, instead of reporting it as is currently done. Separately we should perhaps report readers and writers as separate count.

This 

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