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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