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  1. Solr
  2. SOLR-15014

Runaway replica creation with autoscaling example from ref guide

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Won't Fix
    • 8.6.3
    • None
    • AutoScaling
    • None

    Description

      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)

      ./cloud.sh  new -r   
      

      Create a collection

      http://localhost:8983/solr/admin/collections?action=CREATE&name=newCollection&numShards=2&replicationFactor=1
      

      Add this trigger from the ref guide (https://lucene.apache.org/solr/guide/8_6/solrcloud-autoscaling-triggers.html#node-added-trigger):

      {
        "set-trigger": {
          "name": "node_added_trigger",
          "event": "nodeAdded",
          "waitFor": "5s",
          "preferredOperation": "ADDREPLICA",
          "replicaType": "PULL"
        }
      }
      

      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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            Unassigned Unassigned
            gus Gus Heck
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              Updated:
              Resolved: