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https://issues.apache.org/jira/browse/HDFS-6898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14107580#comment-14107580
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Zhe Zhang commented on HDFS-6898:
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A related question is whether DN should pre-allocate disk space for received
RBW blocks. If the underlying local FS supports fallocate, this will improve
the disk layout of the block.
> DN must reserve space for a full block when an RBW block is created
> -------------------------------------------------------------------
>
> Key: HDFS-6898
> URL: https://issues.apache.org/jira/browse/HDFS-6898
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.5.0
> Reporter: Gopal V
> Assignee: Arpit Agarwal
> Attachments: HDFS-6898.01.patch, HDFS-6898.03.patch
>
>
> DN will successfully create two RBW blocks on the same volume even if the
> free space is sufficient for just one full block.
> One or both block writers may subsequently get a DiskOutOfSpace exception.
> This can be avoided by allocating space up front.
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