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https://issues.apache.org/jira/browse/LUCENE-7980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16182847#comment-16182847
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Amrit Sarkar commented on LUCENE-7980:
--------------------------------------
Patch attached, better error message:
{{Both maxMergeCount and maxThreadCount should be passed (unless default '-1')
or None}}
> Improve ERROR msg on setting maxThreadCount & maxMergeCount for
> ConcurrentMergeScheduler
> ----------------------------------------------------------------------------------------
>
> Key: LUCENE-7980
> URL: https://issues.apache.org/jira/browse/LUCENE-7980
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.1
> Reporter: Amrit Sarkar
> Attachments: LUCENE-7980.patch
>
>
> SOLR-11257
> [~thelabdude],
> I tried tuning the maxThreadCount for my Concurrent scheduler using:
> {code}
> <mergeScheduler class="org.apache.lucene.index.ConcurrentMergeScheduler">
> <int name="maxThreadCount">4</int>
> </mergeScheduler>
> {code}
> and got:
> Validation errors:
> {{Error:
> java.lang.IllegalArgumentException:java.lang.IllegalArgumentException: both
> maxMergeCount and maxThreadCount must be AUTO_DETECT_MERGES_AND_THREADS}}
> Hmmm ... don't know what that means? As I user I need a better error message
> than that ^ Of course looking at the code, it seems I must also set:
> maxMergeCount but that error doesn't tell me that. So this bug is about
> fixing up the error to be more helpful to the user. Of course this is
> advanced functionality, so maybe expecting me to read the code to understand,
> in which case, just close this as invalid.
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