[jira] [Created] (SOLR-13248) Autoscaling based replica placement is broken out of the box

["Shalin Shekhar Mangar (JIRA)" <ji...@apache.org>]

Shalin Shekhar Mangar created SOLR-13248:
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             Summary: 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: 7.7, 7.6
            Reporter: Shalin Shekhar Mangar
             Fix For: 8.0


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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