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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12272) chooseRemoteRack() semantics broken in trunk
Date Mon, 07 Aug 2017 19:58:00 GMT
Kihwal Lee created HDFS-12272:

             Summary: chooseRemoteRack() semantics broken in trunk
                 Key: HDFS-12272
                 URL: https://issues.apache.org/jira/browse/HDFS-12272
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: block placement
    Affects Versions: 3.0.0-alpha3
            Reporter: Kihwal Lee
            Priority: Critical

The {{chooseRemoteRack()}} method in the default block placement policy was designed to pick
from maximum number of racks. E.g. If asked to pick 2 and there are 2 or more racks available,
the two will be on different racks. It wasn't implicit or accidental semantics. There was
a specific logic in {{chooseRandom()}} that makes it happen.

This behavior is broken after HDFS-11530 as this logic was removed from {{chooseRandom()}}.
Now the result is unpredictable. Sometimes the replicas end up in the same rack.

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