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https://issues.apache.org/jira/browse/HDFS-17042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17732295#comment-17732295
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ASF GitHub Bot commented on HDFS-17042:
---------------------------------------

hadoop-yetus commented on PR #5730:
URL: https://github.com/apache/hadoop/pull/5730#issuecomment-1590242662

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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> 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
>            Priority: Major
>              Labels: pull-request-available
>
> We'd like to add two new types of metrics to the existing NN 
> RpcMetrics/RpcDetailedMetrics. These two metrics can then be used as part of 
> SLA/SLO for the HDFS service.
>  * {_}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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