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https://issues.apache.org/jira/browse/HDFS-15288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17171534#comment-17171534
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Ayush Saxena commented on HDFS-15288:
-------------------------------------
Have added the release notes, The BPP is described in the documents as well, as
part of HDFS-14546. Thanx for pointing it out :)
> Add Available Space Rack Fault Tolerant BPP
> -------------------------------------------
>
> Key: HDFS-15288
> URL: https://issues.apache.org/jira/browse/HDFS-15288
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Ayush Saxena
> Assignee: Ayush Saxena
> Priority: Major
> Fix For: 3.4.0
>
> Attachments: HDFS-15288-01.patch, HDFS-15288-02.patch,
> HDFS-15288-03.patch, HDFS-15288-Addendum-01.patch
>
>
> The Present {{AvailableSpaceBlockPlacementPolicy}} extends the Default Block
> Placement policy, which makes it apt for Replicated files. But not very
> efficient for EC files, which by default use.
> {{BlockPlacementPolicyRackFaultTolerant}}. So propose a to add new BPP having
> similar optimization as ASBPP where as keeping the spread of Blocks to max
> racks, i.e as RackFaultTolerantBPP.
> This could extend {{BlockPlacementPolicyRackFaultTolerant}}, rather than the
> {{BlockPlacementPOlicyDefault}} like ASBPP and keep other logics of
> optimization same as ASBPP
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