Question about Overseer calling SPLITSHARD collection API command during autoscaling

[Matthew Faw]

Hi,

So I’ve been trying out the new autoscaling features in solr 7.2.1.  I run the 
following commands when creating my solr cluster:

Set up overseer role:
curl -s 
"solr-service-core:8983/solr/admin/collections?action=ADDROLE&role=overseer&node=$thenode"

Create cluster prefs:
            clusterprefs=$(cat <<-EOF
            {
            "set-cluster-preferences" : [
              {"minimize":"sysLoadAvg"},
              {"minimize":"cores"}
              ]
            }
            EOF
            )
            echo "The cluster prefs request body is: $clusterprefs"
            curl -H "Content-Type: application/json" -X POST -d "$clusterprefs" 
solr-service-core:8983/api/cluster/autoscaling

Cluster policy:
            clusterpolicy=$(cat <<-EOF
            {
            "set-cluster-policy": [
              {"replica": 0, "nodeRole": "overseer"},
              {"replica": "<2", "shard": "#EACH", "node": "#ANY"},
              {"cores": ">0", "node": "#ANY"},
              {"cores": "<5", "node": "#ANY"},
              {"replica": 0, "sysLoadAvg": ">80"}
              ]
            }
            EOF
            )
            echo "The cluster policy is $clusterpolicy"
            curl -H "Content-Type: application/json" -X POST -d 
"$clusterpolicy" solr-service-core:8983/api/cluster/autoscaling

            nodeaddtrigger=$(cat <<-EOF
            {
             "set-trigger": {
              "name" : "node_added_trigger",
              "event" : "nodeAdded",
              "waitFor" : "1s"
             }
            }
            EOF
            )
            echo "The node added trigger request: $nodeaddtrigger"
            curl -H "Content-Type: application/json" -X POST -d 
"$nodeaddtrigger" solr-service-core:8983/api/cluster/autoscaling


I then create a collection with 2 shards and 3 replicas, under a set of nodes 
in an autoscaling group (initially 4, scales up to 10):
            curl -s 
"solr-service-core:8983/solr/admin/collections?action=CREATE&name=${COLLECTION_NAME}&numShards=${NUM_SHARDS}&replicationFactor=${NUM_REPLICAS}&autoAddReplicas=${AUTO_ADD_REPLICAS}&collection.configName=${COLLECTION_NAME}&waitForFinalState=true"


I’ve observed several autoscaling actions being performed – automatically 
re-adding replicas, and moving shards to nodes based on my cluster 
policy/prefs.  However, I have not observed a SPLITSHARD operation.  My 
question is:
1) should I expect the Overseer to be able to call the SPLITSHARD command, or 
is this feature not yet implemented?
2) If it is possible, do you have any recommendations as to how I might force 
this type of behavior to happen?
3) If it’s not implemented yet, when could I expect the feature to be available?

If you need any more details, please let me know! Really excited about these 
new features.

Thanks,
Matthew

The content of this email is intended solely for the individual or entity named 
above and access by anyone else is unauthorized. If you are not the intended 
recipient, any disclosure, copying, distribution, or use of the contents of 
this information is prohibited and may be unlawful. If you have received this 
electronic transmission in error, please reply immediately to the sender that 
you have received the message in error, and delete it. Thank you.