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https://issues.apache.org/jira/browse/HDFS-12008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16061156#comment-16061156
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Kihwal Lee commented on HDFS-12008:
-----------------------------------
I changed the number of nodes from 20 (4 racks) to 100 (10 racks) and did
evenly spreading nodes across racks. The result seems closer to the ideal
value.
|| || 1.0f || 0.6f ||
| ideal | 75% | 65% |
| trunk as is | 67.9% | 53.9% |
| trunk w/change | 74.2% | 64.7% |
I will update the patch so that the test will check for more realistic target
percentage.
> Improve the available-space block placement policy
> --------------------------------------------------
>
> Key: HDFS-12008
> URL: https://issues.apache.org/jira/browse/HDFS-12008
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: block placement
> Affects Versions: 2.8.1
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Attachments: HDFS-12008.patch, RandomAllocationPolicy.png
>
>
> AvailableSpaceBlockPlacementPolicy currently picks two nodes unconditionally,
> then picks one node. It could avoid picking the second node when not
> necessary.
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