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From Selwa <elhama...@gmail.com>
Subject datanode to blocks mapping
Date Sun, 12 Feb 2012 01:41:08 GMT
Hello there,
currently i am working on research about the block placement policy of HDFS.
I want to find the blocks mapping of the pseudo cluster.
then i request the name node for this data structure by the following code

       BlocksMap blocksMap = new BlocksMap(16, 0.75f);
      Collection<BlockInfo>blocks = blocksMap.getBlocks();
              but the collection does not hold any thing - always it is
empty
             blocks.isempty() is becoming true even i saved some files on
the pseudo -cluster.
what is wrong with this code?
is there any other way to find block mapping?

thanks

Selwa

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