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Hadoop >> mail # dev >> How HDFS decides where to put the block

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How HDFS decides where to put the block
Hi, all

I'm confused by a question that "how does the HDFS decide where to put the
data blocks "

I mean that the user invokes some commands like "./hadoop put ***", we
assume that this  file consistes of 3 blocks, but how HDFS decides where
these 3 blocks to be put?

Most of the materials don't involve this issue, but just introduce the data
replica where talking about blocks in HDFS,

can anyone give me some instructions?



Nan Zhu
School of Software,5501
Shanghai Jiao Tong University
800,Dongchuan Road,Shanghai,China