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HADOOP - How the HDFS Blocks are replicated?




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asked SRVMTrainings September 12, 2013 10:33 AM  

How the HDFS Blocks are replicated?


           

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Replication of block are done in Series.
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HDFS uses rack-aware replacement policy to replicate data blocks.

By default each data block is replicated 3 times in the cluster.

In the rack-aware replica replacement policy 2 copies of the data blocks are stored in the same rack & 1 copy is stored on a different rack.
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