Ayush Saxena commented on HDFS-14896:

As we only allocate a single block at a time, why do we need to make this 
configurable and hence reserve X blocks of space on a datanode?

Can you tell us some more about what problem this patch is solving?{quote}

I too have the same doubt.

> Make MIN_BLOCKS_FOR_WRITE configurable
> --------------------------------------
>                 Key: HDFS-14896
>                 URL: https://issues.apache.org/jira/browse/HDFS-14896
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Lisheng Sun
>            Assignee: Lisheng Sun
>            Priority: Minor
>         Attachments: HDFS-14896.001.patch, HDFS-14896.002.patch, 
> HDFS-14896.003(2).patch, HDFS-14896.003.patch, HDFS-14896.004.patch, 
> HDFS-14896.005.patch

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