[jira] [Created] (HDFS-17042) Add rpcCallSuccesses and OverallRpcProcessingTime to RpcMetrics for Namenode

["Xing Lin (Jira)" <ji...@apache.org>]

Xing Lin created HDFS-17042:
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             Summary: Add rpcCallSuccesses and OverallRpcProcessingTime to RpcMetrics for Namenode
                 Key: HDFS-17042
                 URL: https://issues.apache.org/jira/browse/HDFS-17042
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs
    Affects Versions: 3.4.0, 3.3.9
            Reporter: Xing Lin
            Assignee: Xing Lin


We'd like to add two new types of metrics to the existing RpcMetrics/RpcDetailedMetrics. 
 * {_}RpcCallSuccesses{_}: it measures the number of RPC requests where they are successfully processed by a NN (e.g., with a response with an RpcStatus {_}RpcStatusProto.SUCCESS){_}{_}.{_} Then, together with {_}RpcQueueNumOps ({_}which refers the total number of RPC requests{_}){_}, we can derive the RpcErrorRate for our NN, as (RpcQueueNumOps - RpcCallSuccesses) / RpcQueueNumOps. 
 * OverallRpcProcessingTime for each RPC method: this metric measures the overall RPC processing time for each RPC method at the NN. It covers the time from when a request arrives at the NN to when a response is sent back. We are already emitting processingTime for each RPC method today in RpcDetailedMetrics. We want to extend it to emit overallRpcProcessingTime for each RPC method, which includes enqueueTime, queueTime, processingTime, responseTime, and handlerTime.

 



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