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https://issues.apache.org/jira/browse/HDFS-1804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13020367#comment-13020367
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Doug Cutting commented on HDFS-1804:
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Dhruba, I meant biased by available free space. Randomly biased by free space
would, as Todd suggests, not spread load as evenly between devices as would
round-robin. So, if disk A has twice the free space of disks B and C then
allocations should ideally go {A,B,A,C,A,B,A,C...} rather than a stateless
probabilistic allocation which would often send repeated allocations to A,
impacting throughput.
> Modify or add a new block-volume device choosing policy that looks at free
> space
> --------------------------------------------------------------------------------
>
> Key: HDFS-1804
> URL: https://issues.apache.org/jira/browse/HDFS-1804
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: data-node
> Reporter: Harsh J Chouraria
> Priority: Minor
> Fix For: 0.23.0
>
>
> HDFS-1120 introduced pluggable block-volume choosing policies, but still
> carries the vanilla RoundRobin as its default.
> An additional implementation that also takes into consideration the free
> space remaining on the disk (or other params) should be a good addition as an
> alternative to vanilla RR.
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