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https://issues.apache.org/jira/browse/SOLR-13248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16771473#comment-16771473
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ASF subversion and git services commented on SOLR-13248:
--------------------------------------------------------
Commit 884a70d0b7bb009e775702db0b3fe7c509b9ac02 in lucene-solr's branch
refs/heads/branch_8_0 from Shalin Shekhar Mangar
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=884a70d ]
SOLR-13248: Adding upgrade notes which explain the problem and the mitigation
as well as steps to revert to the old behavior
(cherry picked from commit 97875af3f93477f48e4ead1979b2f36797106e06)
> Autoscaling based replica placement is broken out of the box
> ------------------------------------------------------------
>
> Key: SOLR-13248
> URL: https://issues.apache.org/jira/browse/SOLR-13248
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: AutoScaling
> Affects Versions: 7.6, 7.7
> Reporter: Shalin Shekhar Mangar
> Priority: Blocker
> Fix For: 8.0
>
> Attachments: SOLR-13248-withDefaultCollectionProp.patch,
> SOLR-13248.patch, SOLR-13248.patch, SOLR-13248.patch
>
>
> SOLR-12739 made autoscaling as the default replica placement strategy.
> However in the absence of SOLR-12845, replicas can be placed without any
> regards for maxShardsPerNode causing multiple replicas of the same shard to
> be placed on the same node together. Also it was reported in SOLR-13247 that
> createNodeSet is not being respected as well.
> SOLR-13159 was an early signal of the problem but it was not reproducible and
> there was a DNS problem in the cluster too so the root cause was not clear
> then.
> I am creating this blocker issue because as it stands today, we cannot
> guarantee the layout of new collections. At a minimum, we should revert to
> using the legacy replica assignment policy or add default policies with
> SOLR-12845 and have createNodeSet work. Related but not mandatory would be to
> fix SOLR-12847 as well.
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