DataNode should enforce a max block size
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                 Key: HDFS-583
                 URL: https://issues.apache.org/jira/browse/HDFS-583
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: data-node
            Reporter: Hairong Kuang


When DataNode creates a replica, it should enforce a max block size, so clients 
can't go crazy. One way of enforcing this is to make BlockWritesStreams to be 
filter steams that check the block size.

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