Otis Gospodnetic created LUCENE-5134:
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             Summary: Consider implementing "lookback" merge policy
                 Key: LUCENE-5134
                 URL: https://issues.apache.org/jira/browse/LUCENE-5134
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Otis Gospodnetic
            Priority: Minor


In 
http://blog.mikemccandless.com/2011/02/visualizing-lucenes-segment-merges.html 
Mike mentioned lookahead as something that could possibly yield more
optimal merges.

But what about lookback?

What if some sort of stats were kept about about which segments were
picked for merges?  With some sort of stats in hand, could one look
back and, knowing what happened after those merges, evaluate if more
optimal merge choices could have been made and then use that "next
time"?

See http://search-lucene.com/m/D7ypz1gT2H91


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