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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HDDS-2166) Some RPC metrics are missing from SCM prometheus endpoint
Date Fri, 27 Sep 2019 10:30:00 GMT

     [ https://issues.apache.org/jira/browse/HDDS-2166?focusedWorklogId=319477&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-319477

ASF GitHub Bot logged work on HDDS-2166:

                Author: ASF GitHub Bot
            Created on: 27/Sep/19 10:29
            Start Date: 27/Sep/19 10:29
    Worklog Time Spent: 10m 
      Work Description: elek commented on issue #1505: HDDS-2166. Some RPC metrics are missing
from SCM prometheus endpoint
URL: https://github.com/apache/hadoop/pull/1505#issuecomment-535885148
   Thanks @xiaoyuyao the review. I will commit it after a new jenkins build.
   Debug System.out.println is removed (from the patch and also from the previous method).
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Issue Time Tracking

    Worklog Id:     (was: 319477)
    Time Spent: 1h 10m  (was: 1h)

> 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: Marton Elek
>            Assignee: Marton Elek
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 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"}
> {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

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