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

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

Wei-Chiu Chuang created HDFS-14959:
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             Summary: [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


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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