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

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

Gus Heck created SOLR-15014:
-------------------------------

             Summary: 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
         Attachments: 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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