[jira] [Resolved] (HDFS-14959) [SBNN read] access time should be turned off

["Wei-Chiu Chuang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-14959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wei-Chiu Chuang resolved HDFS-14959.
------------------------------------
    Resolution: Fixed

Merged the PR to trunk and cherry pick the commit to branch-3.2 and branch-3.1.
Thanks [~csun]!

> [SBNN read] access time should be turned off
> --------------------------------------------
>
>                 Key: HDFS-14959
>                 URL: https://issues.apache.org/jira/browse/HDFS-14959
>             Project: Hadoop HDFS
>          Issue Type: Task
>          Components: documentation
>            Reporter: Wei-Chiu Chuang
>            Assignee: Chao Sun
>            Priority: Major
>             Fix For: 3.3.0, 3.1.4, 3.2.2
>
>
> Both Uber and Didi shared that access time has to be switched off to avoid spiky NameNode RPC process time. If access time is not off entirely, getBlockLocations RPCs have to update access time and must access the active NameNode. (that's my understanding. haven't checked the code)
> We should record this as a best practice in our doc.
> (If you are on the ASF slack, check out this thread
> https://the-asf.slack.com/archives/CAD7C52Q3/p1572033324008600)



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