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https://issues.apache.org/jira/browse/SOLR-17148?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Pugh resolved SOLR-17148.
------------------------------
Fix Version/s: 9.6.0
Resolution: Fixed
Thanks [~duttsanjay] for this nice fix!
> Config API lies about setting cache enabled=false
> -------------------------------------------------
>
> Key: SOLR-17148
> URL: https://issues.apache.org/jira/browse/SOLR-17148
> Project: Solr
> Issue Type: Bug
> Components: config-api
> Reporter: Chris M. Hostetter
> Assignee: Eric Pugh
> Priority: Major
> Fix For: 9.6.0
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> Using the stock solr {{gettingstarted}} example, you can run the command
> below and it will give all evidence that it has disabled the document cache:
> {noformat}
> curl -X POST 'http://localhost:8983/solr/gettingstarted/config/'
> -H'Content-type: application/json' -d
> '{"set-property":{"query.documentCache.enabled":false}}'
> {noformat}
> * Api command succeeds
> * {{configoverlay.json}} is updated in ZK
> * SolrCore reloads happen for all of the replicas of this collection
> ...but doesn't actually disable the cache. It's still there and in use (easy
> to verify by executing queries and looking at metrics)
> Explicitly stopping & restarting the solr nodes doesn't fix the problem
> either.
> They {{enabled}} property name appears to be explicitly allowed by the Config
> API, because trying to set other arbitrary properties fails (even when
> supported by the {{CaffieneCache}} impl)...
> {noformat}
> $ curl -X POST 'http://localhost:8983/solr/gettingstarted/config/'
> -H'Content-type: application/json' -d
> '{"set-property":{"query.documentCache.async":false}}'
> {
> "responseHeader":{
> "status":400,
> "QTime":8},
> "errorMessages":["error processing commands, errors:
> [{errorMessages=['query.documentCache.async' is not an editable property],
> set-property={query.documentCache.async=false}}], \n"],
> {noformat}
> ...suggesting that modifying the {{enabled}} property is intentionally
> supported – but doesn't work.
>
> ----
>
> A quick & dirty workaround is setting the size=-1 and ignoring the ERROR in
> the logs on every newSearcher...
> {noformat}
> curl -X POST 'http://localhost:8983/solr/gettingstarted/config/'
> -H'Content-type: application/json' -d
> '{"set-property":{"query.documentCache.size":-1}}'
> {noformat}
> (Which seems to indicate that whatever the problem is, it's specific to
> {{enabled}} – and not a general problem with modifying cache configuration
> via the Config API)
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