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From "Noble Paul (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SOLR-12023) Autoscaling policy engine shuffles replicas needlessly and can also suggest nonexistent replicas to be moved
Date Thu, 17 Jan 2019 06:27:00 GMT

     [ https://issues.apache.org/jira/browse/SOLR-12023?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Noble Paul resolved SOLR-12023.
-------------------------------
    Resolution: Fixed

> 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
>            Assignee: Noble Paul
>            Priority: Major
>             Fix For: 7.6, 8.0
>
>         Attachments: SOLR-11066-failing.patch, SOLR-12023.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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