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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-16266) Add more fine-grained processing time metrics to the RPC layer
Date Fri, 26 Apr 2019 16:01:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-16266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16827074#comment-16827074
] 

Erik Krogen commented on HADOOP-16266:
--------------------------------------

Hi [~stevel@apache.org], thanks for sharing your thoughts. I see that blog post is from 2015.
Other explanations I have found indicate that what you describe used to be a very significant
problem, but that in modern JDKs (7+), the JVM guarantees that System.nanoTime works as you
would expect even in the face of multi-cored systems. This guarantee was originally plagued
by bugs, but all known outstanding issues have been fixed, so IIUC from my reading, there
should be no more issues in using it as such. Do you believe that all of your concerns from
2015 are still relevant in today's world?

> Add more fine-grained processing time metrics to the RPC layer
> --------------------------------------------------------------
>
>                 Key: HADOOP-16266
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16266
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: Christopher Gregorian
>            Assignee: Christopher Gregorian
>            Priority: Minor
>              Labels: rpc
>         Attachments: HADOOP-16266.001.patch, HADOOP-16266.002.patch, HADOOP-16266.003.patch,
HADOOP-16266.004.patch, HADOOP-16266.005.patch
>
>
> Splitting off of HDFS-14403 to track the first part: introduces more fine-grained measuring
of how a call's processing time is split up.



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