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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