[
https://issues.apache.org/jira/browse/HDFS-7891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14375740#comment-14375740
]
Walter Su commented on HDFS-7891:
---------------------------------
the {{sortedRack}} results were obtained from 002 patch and many optimizations
for rack accessing in {{NetworkTopology}} . The optimizations is not include
in 002 patch.
002 patch has a severe problem. It doesn't handle space balance well. ( shuffle
top 1/4)
The result from 003 patch which using {{maxNodesPerRack}} method is close to
{{BlockPlacementPolicyDefault}}. The performance is not so bad. I think
performance is not our first concern.
004 patch remove the dulplicated code in 003 patch.
004 patch has better simplicity and space balance than 002 patch.
Hi, [~zhz]. Could you help me revert HADOOP-11676?
> A block placement policy with best fault tolerance
> --------------------------------------------------
>
> Key: HDFS-7891
> URL: https://issues.apache.org/jira/browse/HDFS-7891
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Walter Su
> Assignee: Walter Su
> Attachments: HDFS-7891.002.patch, HDFS-7891.003.patch,
> HDFS-7891.patch, PlacementPolicyBenchmark.txt, testresult.txt
>
>
> a block placement policy tries its best to place replicas to most racks.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
