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https://issues.apache.org/jira/browse/SOLR-11504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16233893#comment-16233893
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Michael McCandless commented on SOLR-11504:
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Does Solr not use a thread pool for indexing?
> Provide a config to restrict number of indexing threads
> --------------------------------------------------------
>
> Key: SOLR-11504
> URL: https://issues.apache.org/jira/browse/SOLR-11504
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 5.3, 6.0, 7.0
> Reporter: Nawab Zada Asad iqbal
> Priority: Major
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> For heavy indexing load (through REST api), Solr does not have any way to
> restrict number of threads. There used to be a config in lucene to restrict
> number of threads but that has been removed since
> https://issues.apache.org/jira/browse/LUCENE-6659 .
> For example, in my bulk indexing scenario, within few minutes, my solr server
> had created 300 parallel threads each writing its own segment. The result was
> tons of small segments getting flushed to disk (as total RAM limit was
> reached quickly by sum of all segments), and solr has to spend time later to
> merge them into reasonable sizes.
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