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POInformations about TieredMergePolicy
 

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  1. POInformations about TieredMergePolicy
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    <p>I would like to well understand Solr merge behaviour. I did some researches on the different merge policies. And it seems that the TieredMergePolicy is better than old merge policies (LogByteSizeMergePolicy, etc ...). That's why I use this one and that's the default policy on last solr versions.</p> <p>First, I give you some interesting links that I've read to have a better idea of merge process : <a href="http://java.dzone.com/news/merge-policy-internals-solr" rel="nofollow">http://java.dzone.com/news/merge-policy-internals-solr</a> <a href="http://blog.mikemccandless.com/2011/02/visualizing-lucenes-segment-merges.html" rel="nofollow">http://blog.mikemccandless.com/2011/02/visualizing-lucenes-segment-merges.html</a></p> <p>According to the official documentation of Lucene, I would like to ask several questions on it : <a href="http://lucene.apache.org/core/3_2_0/api/all/org/apache/lucene/index/TieredMergePolicy.html" rel="nofollow">http://lucene.apache.org/core/3_2_0/api/all/org/apache/lucene/index/TieredMergePolicy.html</a></p> <p><b>Questions</b></p> <p>1- In the official documentation, there is one method called setExpungeDeletesPctAllowed(double v). And in the Solr 4.3.0, I have checked in the TieredMergePolicy class and I didn't find this method. There is another method that look like this one, called : setForceMergeDeletesPctAllowed(double v). Is there any differences between both methods ? </p> <p>2- Are both methods above called only when you do a ExpungeDelete and an optimization or Are they called when a normal merge.</p> <p>3- I've read that merges beetween segments are done according a pro-rata of deleted documents percentage on a segment. By default, this percentage is set to 10%. Does it possible to set this value to 0% to be sure that there is no more deleted documents in the index after merging ?</p> <p>I need to reduce the size of my index without call optimize() method if it's possible. That's why any informations about merge process would be interesting for me.</p> <p>Thanks</p>
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