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https://issues.apache.org/jira/browse/SOLR-11026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16091352#comment-16091352
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Noble Paul commented on SOLR-11026:
-----------------------------------
Today, suggester only checks if there are any new violations caused by an
operation. It should also check if the operation is making the target node more
loaded than the source node
> Policy can suggest more operations than necessary
> -------------------------------------------------
>
> Key: SOLR-11026
> URL: https://issues.apache.org/jira/browse/SOLR-11026
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: AutoScaling, SolrCloud
> Reporter: Shalin Shekhar Mangar
> Assignee: Noble Paul
> Labels: autoscaling
> Fix For: master (8.0), 7.1
>
>
> To reproduce:
> {code}
> ./bin/solr -e cloud -noprompt
> {code}
> Add policy and preferences:
> {code}
> { 'set-cluster-policy': [ {'cores':'<10', 'node':'#ANY'},
> {'replica':'<2', 'shard': '#EACH', 'node': '#ANY'},
> {'nodeRole':'overseer', 'replica':0} ],
> 'set-cluster-preferences': [{'minimize': 'cores'}]
> }
> {code}
> Add a trigger:
> {code}
> {
> 'set-trigger': {
> 'name' : 'node_added_trigger',
> 'event' : 'nodeAdded',
> 'waitFor' : '1s'
> }
> }
> {code}
> Shutdown a node (so only 1 is live)
> {code}
> ./bin/solr stop -p 7574
> {code}
> Add a collection with 2 shards, 1 replica
> {code}
> http://localhost:8983/solr/admin/collections?action=create&name=test&replicationFactor=1&numShards=2&maxShardsPerNode=2&wt=json
> {code}
> The diagnostic output at this point is:
> {code}
> {
> "responseHeader": {
> "status": 0,
> "QTime": 23
> },
> "diagnostics": {
> "sortedNodes": [
> {
> "node": "127.0.1.1:8983_solr",
> "cores": 2
> }
> ],
> "violations": []
> },
> "WARNING": "This response format is experimental. It is likely to change
> in the future."
> }
> {code}
> Start the other node that we had shutdown earlier:
> {code}
> "bin/solr" start -cloud -p 7574 -s "example/cloud/node2/solr" -z
> localhost:9983
> {code}
> The trigger kicks in but both cores are moved to the new node. Diagnostics
> output at steady state:
> {code}
> {
> "responseHeader": {
> "status": 0,
> "QTime": 23
> },
> "diagnostics": {
> "sortedNodes": [
> {
> "node": "127.0.1.1:7574_solr",
> "cores": 2
> },
> {
> "node": "127.0.1.1:8983_solr",
> "cores": 0
> }
> ],
> "violations": []
> },
> "WARNING": "This response format is experimental. It is likely to change
> in the future."
> }
> {code}
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