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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