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https://issues.apache.org/jira/browse/SOLR-13155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16749848#comment-16749848
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Andrzej Bialecki commented on SOLR-13155:
------------------------------------------
This patch implements a tool for getting the current suggestions / diagnostics
and/or testing the current cluster against the supplied autoscaling
configuration.
The tool is integrated into the SolrCLI suite, and hooked up to the {{bin/solr
autoscaling}} script.
One notable addition is a method in {{RedactionUtils}} for replacing collection
names and node names / IPs in the output data. You can see it in action when
you invoke the tool with the {{-r}} option:
{code}
...
{
"liveNodes":[
"N_1_solr",
"N_0_solr"],
"violations":[
{
"collection":"COLL_0",
"node":"N_1_solr",
"tagKey":"N_1_solr",
"violation":{
"replica":{
"NRT":2,
"count":2},
"delta":1.0},
"clause":{
"replica":"<2",
"shard":"#ANY",
"node":"#ANY",
"collection":"COLL_0"},
"violatingReplicas":[
{"core_node7":{
"core":"COLL_0_shard2_replica_n3",
"shard":"shard2",
"collection":"COLL_0",
"node_name":"N_1_solr",
"type":"NRT",
"leader":"true",
"base_url":"http://N_1/solr";,
"state":"active",
"force_set_state":"false",
"INDEX.sizeInGB":6.426125764846802E-8}},
{"core_node6":{
"core":"COLL_0_shard1_replica_n2",
"shard":"shard1",
"collection":"COLL_0",
"node_name":"N_1_solr",
"type":"NRT",
"leader":"true",
"base_url":"http://N_1/solr";,
"state":"active",
"force_set_state":"false",
"INDEX.sizeInGB":6.426125764846802E-8}}]},
...
{code}
TODO: hook up the tool to the Windows scripts. My {{COMMAND.COM}}-fu is nearly
nonexistent ;)
> CLI tool for testing autoscaling suggestions against a live cluster
> -------------------------------------------------------------------
>
> Key: SOLR-13155
> URL: https://issues.apache.org/jira/browse/SOLR-13155
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: AutoScaling
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Fix For: 8.0, master (9.0)
>
> Attachments: SOLR-13155.patch
>
>
> Solr already provides /autoscaling/diagnostics and /autoscaling/suggestions
> endpoints. In some situations it would be very helpful to be able to run
> "what if" scenarios using data about nodes and replicas taken from a
> production cluster but with a different autoscaling policy than the one that
> is deployed, without also worrying that the calculations would negatively
> impact a production cluster's Overseer leader.
> All necessary classes (including the Policy engine) are self-contained in the
> SolrJ component, so it's just a matter of packaging and writing a CLI tool +
> a wrapper script.
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