Shalin Shekhar Mangar commented on SOLR-12023:

Here is the full patch from SOLR-11066 with 
TriggerIntegrationTest.testScheduledTrigger that demonstrates the problem.

> 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
>            Priority: Major
>             Fix For: master (8.0), 7.3
>         Attachments: SOLR-11066-failing.patch
> 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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