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https://issues.apache.org/jira/browse/HDDS-10516?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang resolved HDDS-10516.
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Fix Version/s: 1.5.0
Resolution: Fixed
> Add metrics for chunk read from internal ratis
> ----------------------------------------------
>
> Key: HDDS-10516
> URL: https://issues.apache.org/jira/browse/HDDS-10516
> Project: Apache Ozone
> Issue Type: Improvement
> Reporter: Sammi Chen
> Assignee: Sammi Chen
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.5.0
>
>
> Currently, there are following metrics on every datanode for chunk reads.
> {code:java}
> "numReadChunk" : 136237,
> "bytesReadChunk" : 1395066880,
> "LatencyReadChunkNumOps" : 136237,
> "LatencyReadChunkAvgTime" : 1.0, {code}
> The chunk read requests come from both remote user client and internal ratis
> if the datanode is the leader of the ratis group. Currently, we cannot tell
> how much data is read by user client, and how much data is read by ratis
> leader itself. So this task is to introduce a new set of following metrics
> for read by ratis,
> {code:java}
> numReadStateMachine // the request counts from ratis
> bytesReadStateMachine // the total bytes read by ratis{code}
> So the final goal is we want to know how much data is read by user client. So
> for read from user client,
> bytesReadChunk - bytesReadStateMachine = bytes read by user clients
> numReadChunk - numReadStateMachine = request counts from user clients
>
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