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https://issues.apache.org/jira/browse/SOLR-15014?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gus Heck updated SOLR-15014:
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Attachment: Screen Shot 2020-11-23 at 11.40.29 AM.png
> Runaway replica creation with autoscaling example from ref guide
> ----------------------------------------------------------------
>
> Key: SOLR-15014
> URL: https://issues.apache.org/jira/browse/SOLR-15014
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: AutoScaling
> Affects Versions: 8.6.3
> Reporter: Gus Heck
> Priority: Major
> Attachments: Screen Shot 2020-11-23 at 11.40.29 AM.png,
> image-2020-11-23-11-37-15-124.png
>
>
> Although the present autoscaling implementation is deprecated, I have a
> client intent on using it, and in trying to create rules that ensure all
> replicas on all nodes, I wound up getting into a state where one replica was
> (apparently) infinitely creating new copies of itself. The boiled down steps
> to reproduce:
> Create a 4 node cluster locally for testing from a checkout of the tagged
> version for 8.6.3
> (Using solr/cloud-dev/cloud.sh)
> {code:java}
> ./cloud.sh new -r
> {code}
> Create a collection
> {code:java}
> http://localhost:8983/solr/admin/collections?action=CREATE&name=newCollection&numShards=2&replicationFactor=1
> {code}
> Add this trigger from the ref guide
> ([https://lucene.apache.org/solr/guide/8_6/solrcloud-autoscaling-triggers.html#node-added-trigger):]
> {code:java}
> {
> "set-trigger": {
> "name": "node_added_trigger",
> "event": "nodeAdded",
> "waitFor": "5s",
> "preferredOperation": "ADDREPLICA",
> "replicaType": "PULL"
> }
> }
> {code}
> Reboot the cluster, and when it comes up infinite replica creation ensues
> (attaching screen shot of admin UI showing replicated shard momentarily)
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