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https://issues.apache.org/jira/browse/HDFS-1804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron T. Myers updated HDFS-1804:
---------------------------------
Release Note: There is now a new option to have the DN take into account
available disk space on each volume when choosing where to place a replica when
performing an HDFS write. This can be enabled by setting the config
"dfs.datanode.fsdataset.volume.choosing.policy" to the value
"org.apache.hadoop.hdfs.server.datanode.fsdataset.AvailableSpaceVolumeChoosingPolicy".
Adding a release note to advertise this new feature better per Harsh's request
in HDFS-4830.
> 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: datanode
> Affects Versions: 2.0.4-alpha
> Reporter: Harsh J
> Assignee: Aaron T. Myers
> Priority: Minor
> Fix For: 2.0.5-beta
>
> Attachments: HDFS-1804.patch, HDFS-1804.patch, HDFS-1804.patch,
> HDFS-1804.patch, HDFS-1804.patch
>
>
> 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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