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Posted to dev@lucene.apache.org by "Ishan Chattopadhyaya (JIRA)" <ji...@apache.org> on 2019/02/21 06:12:00 UTC
[jira] [Reopened] (SOLR-13248) Autoscaling based replica placement
is broken out of the box
[ https://issues.apache.org/jira/browse/SOLR-13248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ishan Chattopadhyaya reopened SOLR-13248:
-----------------------------------------
Reopening this for backporting to branch_7x and branch_7_7 for inclusion into 7.7.1 release.
> 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
> Assignee: Shalin Shekhar Mangar
> Priority: Blocker
> Fix For: 8.0, master (9.0)
>
> 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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