[jira] [Commented] (SOLR-15014) Runaway replica creation with autoscaling example from ref guide

["Gus Heck (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-15014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17237495#comment-17237495 ] 

Gus Heck commented on SOLR-15014:
---------------------------------

Discussion on slack suggests that given the fact that this functionality is going away, the primary thing here will be to remove the example from the ref guide. (or if folks have an idea how to mitigate it with additional configuration, add that to the ref guide, but I haven't found such yet)

> 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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