[
https://issues.apache.org/jira/browse/HDFS-12725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16221224#comment-16221224
]
Xiao Chen edited comment on HDFS-12725 at 10/26/17 8:54 PM:
------------------------------------------------------------
Patch 1 to reproduce the error and fix.
This keeps the {{getMaxNodesPerRack}} calculation so normal placements can
still be as even as possible. Modified unit test fail-before-pass-after.
In real clusters this come in the form of message {{Cannot allocate parity
block}} in the client and
{{org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy: Failed to
place enough replicas, still in need of 3 to reach 14}} in the NN.
[~andrew.wang] and [~eddyxu], could you take a look?
was (Author: xiaochen):
Patch 1 to reproduce the error and fix. [~andrew.wang] and [~eddyxu], could you
take a look?
> 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
> Attachments: HDFS-12725.01.patch, HDFS-12725.01.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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
