[jira] [Assigned] (HDDS-9377) Call MutableStat.add(long x) method as a runnable task in a separate service executor

["Alex Juncevich (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDDS-9377?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alex Juncevich reassigned HDDS-9377:
------------------------------------

    Assignee: Alex Juncevich  (was: Vyacheslav Tutrinov)

> Call MutableStat.add(long x) method as a runnable task in a separate service executor
> -------------------------------------------------------------------------------------
>
>                 Key: HDDS-9377
>                 URL: https://issues.apache.org/jira/browse/HDDS-9377
>             Project: Apache Ozone
>          Issue Type: Sub-task
>          Components: OM, S3, SCM
>    Affects Versions: 1.4.0
>            Reporter: Vyacheslav Tutrinov
>            Assignee: Alex Juncevich
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: Screenshot 2023-09-09 at 17.59.50.png
>
>
> We've made an experiment: load 15mlns of 1k files to the EC bucket and read them (3 clients in 50 threads => 150 threads in total). A high metrics related method contention was detected on org.apache.hadoop.metrics2.lib.MutableStat#add(long, long) (as it;s synchronized) - we hung for about a minute (sum) of a 10-minute profiling session
> !Screenshot 2023-09-09 at 17.59.50.png!
> The metrics-related operation results are not required at the time of execution, hence, they can be executed in another thread pool



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