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From Kevin <klz...@gmail.com>
Subject DFS, write sequence number and consistency
Date Mon, 21 Jul 2008 22:14:08 GMT
Hi there,

It looks that current hadoop dfs puts the DFSClient as the "primary
node". See http://wiki.apache.org/hadoop/DFS_requirements

In Google file system, the write synchronization by multiple clients
is controlled by the primary node which decide the sequence of the
mutations to a block and apply to every replica. But in hadoop, how is
this achieved? If multiple clients write to the same block, what will
happen? Moreover, is this scenario possible under current situation?

Thanks and regards,

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