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https://issues.apache.org/jira/browse/SOLR-13155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16766434#comment-16766434
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Jason Gerlowski commented on SOLR-13155:
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Hey [~ab], took a look at your latest patch this morning while preparing to
write a Windows equivalent of the {{bin/solr}} bits you just added. One
question:
You add a {{print_usage}} section for the new autoscaling command...
{code}
+ elif [ "$CMD" == "autoscaling" ]; then
+ echo ""
+ echo "Usage: solr autoscaling [-z zkHost] [-a <autoscaling.json.file>]
[-s] [-d] [-n] [-r]"
+ echo ""
+ echo " Calculate autoscaling policy suggestions and diagnostic
information, using either the deployed"
+ echo " autoscaling configuration or the one supplied on the command line.
This calculation takes place"
+ echo " on the client-side without affecting the running cluster except
for fetching the node and replica"
+ echo " metrics from the cluster. For detailed usage instructions, do:"
+ echo ""
+ echo " bin/solr autoscaling -help"
+ echo ""
{code}
But I can't figure out what command would actually trigger this help text. The
"autoscaling" command defers parsing its args until Java-land, so any
{{-h}}/{{--help}}/etc. argument will trigger the commons-cli generated help
text instead:
{code}
➜ solr git:(master) ✗ bin/solr autoscaling -h
INFO - 2019-02-12 15:33:01.434;
org.apache.solr.util.configuration.SSLCredentialProviderFactory; Processing SSL
Credential Provider chain: env;sysprop
Failed to parse command-line arguments due to: Unrecognized option: -h
usage: org.apache.solr.util.SolrCLI
-a,--config <CONFIG> Autoscaling config file, defaults to the one
deployed in the cluster.
-all Turn on all options to get all available
information.
-c,--clusterState Show ClusterState (collections layout)
-d,--diagnostics Show calculated diagnostics
-help Print this message
-n,--sortedNodes Show sorted nodes with diagnostics
-r,--redact Redact node and collection names (original names
will be consistently randomized)
-s,--suggestions Show calculated suggestions
-stats Show summarized collection & node statistics.
-verbose Generate verbose log messages
-zkHost <HOST> Address of the Zookeeper ensemble; defaults to:
localhost:9983
{code}
Am I missing some command that manages to trigger that help text, or is it
dead-code that we can remove or change? (I'm only asking so I know whether to
include similar help text in the solr.cmd version. If the {{bin/solr}} help
text is dead code, I'm happy to remove it for you when I commit plumbing on the
Windows side tomorrow.)
> 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-13155.patch, 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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