Nawab Zada Asad iqbal created SOLR-11504:
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             Summary: 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: 7.0, 6.0, 5.3
            Reporter: Nawab Zada Asad iqbal


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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