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From "Pritam Damania (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2576) Namenode should have a favored nodes hint to enable clients to have control over block placement.
Date Mon, 21 Nov 2011 18:28:51 GMT
Namenode should have a favored nodes hint to enable clients to have control over block placement.
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                 Key: HDFS-2576
                 URL: https://issues.apache.org/jira/browse/HDFS-2576
             Project: Hadoop HDFS
          Issue Type: New Feature
            Reporter: Pritam Damania


Sometimes Clients like HBase are required to dynamically compute the datanodes it wishes to
place the blocks for a file for higher level of locality. For this purpose there is a need
of a way to give the Namenode a hint in terms of a favoredNodes parameter about the locations
where the client wants to put each block. The proposed solution is a favored nodes parameter
in the addBlock() method and in the create() file method to enable the clients to give the
hints to the NameNode about the locations of each replica of the block. Note that this would
be just a hint and finally the NameNode would look at disk usage, datanode load etc. and decide
whether it can respect the hints or not.

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