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https://issues.apache.org/jira/browse/HDFS-14896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16947800#comment-16947800
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Stephen O'Donnell commented on HDFS-14896:
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>From the patch it looks like MIN_BLOCKS_TO_WRITE was previously hard coded to
>1, and scanning the patch quickly, that seems to be used to calculate if there
>is free space on a datanode to allocate a block - is that correct?
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?
> 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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