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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