[jira] [Created] (SOLR-12023) Autoscaling policy engine shuffles replicas needlessly and can also suggest nonexistent replicas to be moved

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

Shalin Shekhar Mangar created SOLR-12023:
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             Summary: Autoscaling policy engine shuffles replicas needlessly and can also suggest nonexistent replicas to be moved
                 Key: SOLR-12023
                 URL: https://issues.apache.org/jira/browse/SOLR-12023
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: AutoScaling, SolrCloud
            Reporter: Shalin Shekhar Mangar
             Fix For: master (8.0), 7.3


A test that I wrote in SOLR-11066 found the following problem:

Cluster: 2 nodes
Collection: 1 shard, 3 replicas, maxShardsPerNode=5
No autoscaling policy or preference applied

When the trigger runs, the computed plan needlessly shuffles all three replicas and then proceeds to return suggestions with only numbers as core names. These cores do not exist. I found that these numbers are generated internally by the framework as placeholders for moved cores for further calculations. They should never ever be suggested to the users.



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