Bala Kolla created LUCENE-6842:
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             Summary: No way to limit the fields cached in memory and leads to 
OOM when there are thousand of fields (thousands)
                 Key: LUCENE-6842
                 URL: https://issues.apache.org/jira/browse/LUCENE-6842
             Project: Lucene - Core
          Issue Type: Bug
          Components: core/search
    Affects Versions: 4.6.1
         Environment: Linux, openjdk 1.6.x
            Reporter: Bala Kolla


I am opening this defect to get some guidance on how to handle a case of server 
running out of memory and it seems like it's something to do how we index. But 
want to know if there is anyway to reduce the impact of this on memory usage 
before we look into the way of reducing the number of fields. 

Basically we have many thousands of fields being indexed and it's causing a 
large amount of memory being used (25GB) and eventually leading to application 
to hang and force us to restart every few minutes.



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