Fengnan Li created HDFS-15754:
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Summary: Create packet metrics for DataNode
Key: HDFS-15754
URL: https://issues.apache.org/jira/browse/HDFS-15754
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Reporter: Fengnan Li
Assignee: Fengnan Li
In BlockReceiver, right now when there is slowness in writeToMirror,
writeToDisk and writeToOsCache, it is dumped in the debug log. In practice we
have found these are quite useful signal to detect issues in DataNode, so it
will be great these metrics can be exposed by JMX.
Also we introduced totalPacket received to use a percentage as a signal to
detect the potentially underperforming datanode since datanodes across one HDFS
cluster may received different numbers of packets totally.
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