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https://issues.apache.org/jira/browse/HDDS-2166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elek, Marton updated HDDS-2166:
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Status: Patch Available (was: Open)
> Some RPC metrics are missing from SCM prometheus endpoint
> ---------------------------------------------------------
>
> Key: HDDS-2166
> URL: https://issues.apache.org/jira/browse/HDDS-2166
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Reporter: Elek, Marton
> Assignee: Elek, Marton
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In Hadoop metrics it's possible to register multiple metrics with the same
> name but with different tags. For example each RpcServere has an own metrics
> instance in SCM.
> {code}
> "name" :
> "Hadoop:service=StorageContainerManager,name=RpcActivityForPort9860",
> "name" :
> "Hadoop:service=StorageContainerManager,name=RpcActivityForPort9863",
> {code}
> They are converted by PrometheusSink to a prometheus metric line with proper
> name and tags. For example:
> {code}
> rpc_rpc_queue_time60s_num_ops{port="9860",servername="StorageContainerLocationProtocolService",context="rpc",hostname="72736061cbc5"}
> 0
> {code}
> The PrometheusSink uses a Map to cache all the recent values but
> unfortunately the key contains only the name (rpc_rpc_queue_time60s_num_ops
> in our example) but not the tags (port=...)
> For this reason if there are multiple metrics with the same name, only the
> first one will be displayed.
> As a result in SCM only the metrics of the first RPC server can be exported
> to the prometheus endpoint.
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