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From "Sneha Vijayarajan (Jira)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-17250) ABFS: Allow random read sizes to be of buffer size
Date Tue, 08 Sep 2020 11:07:00 GMT
Sneha Vijayarajan created HADOOP-17250:

             Summary: ABFS: Allow random read sizes to be of buffer size
                 Key: HADOOP-17250
                 URL: https://issues.apache.org/jira/browse/HADOOP-17250
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/azure
    Affects Versions: 3.1.4
            Reporter: Sneha Vijayarajan
            Assignee: Sneha Vijayarajan

ADLS Gen2/ABFS driver is optimized to read only the bytes that are requested for when the
read pattern is random. 

It was observed in some spark jobs that though the reads are random, the next read doesn't
skip by a lot and can be served by the earlier read if read was done in buffer size. As a
result the job triggered a higher count of read calls and resulted in higher job runtime.

When these jobs were run against Gen1 which always reads in buffer size , the jobs fared well. 

In this Jira we try to provide a control over config on random read to be of requested size
or buffer size.

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