[
https://issues.apache.org/jira/browse/HDFS-7891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14387505#comment-14387505
]
Zhe Zhang commented on HDFS-7891:
---------------------------------
Thanks Walter for the analysis. I suggest we implement a _best fault tolerance_
policy first, spanning as many racks as there are available. Then we can add
another policy with weaker FT but less traffic. In that new policy, I think the
target is to have at least the same level of FT as 3-way replication
(tolerating 1 rack failure, or 2 concurrent node failures).
> 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-7891.004.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)
