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https://issues.apache.org/jira/browse/HDFS-12725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16236556#comment-16236556
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Lei (Eddy) Xu edited comment on HDFS-12725 at 11/2/17 8:42 PM:
---------------------------------------------------------------
LGTM +1 pending the following comment:
{noformat}
" (maxNodesPerRack={}, numOfReplicas={}) nodes " +
144 "evenly across racks, falling back to uneven placement.
{noformat}
It should be something like "falling back to evenly placement on remained
racks"
Thanks Xiao.
Btw, please verify that the test failures.
was (Author: eddyxu):
LGTM +1 pending the following comment:
{preformat}
" (maxNodesPerRack={}, numOfReplicas={}) nodes " +
144 "evenly across racks, falling back to uneven placement.
{preformat}
It should be something like "falling back to evenly placement on remained
racks"
Thanks Xiao.
Btw, please verify that the test failures.
> BlockPlacementPolicyRackFaultTolerant still fails with racks with very few
> nodes
> --------------------------------------------------------------------------------
>
> Key: HDFS-12725
> URL: https://issues.apache.org/jira/browse/HDFS-12725
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: erasure-coding
> Affects Versions: 3.0.0
> Reporter: Xiao Chen
> Assignee: Xiao Chen
> Priority: Major
> Labels: hdfs-ec-3.0-must-do
> Attachments: HDFS-12725.01.patch, HDFS-12725.02.patch,
> HDFS-12725.03.patch, HDFS-12725.04.patch, HDFS-12725.05.patch
>
>
> HDFS-12567 tries to fix the scenario where EC blocks may not be allocated in
> extremely rack-imbalanced cluster.
> The added fall-back step of the fix could be improved to do a best-effort
> placement. This is more likely to happen in testing than in real clusters.
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