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From "Jason.H" <469673...@qq.com>
Subject re-use IndexWriter
Date Tue, 08 Jul 2014 09:08:47 GMT
nowadays , i've been trying every way to improve the performance of indexing , IndexWriter's
close operation is really costly , and the Lucene's doc sugguest to re-use IndexWriter instance
, i  did it , i  kept the indexWriter instance , and give it back to every request thread
, But there comes a big problem ,  i never search the index changes because the index changes
is till in the RAM , maybe there's a way to flush all the changes to the stable Storage and
this operation don't close the IndexWriter so i could re-use it  . am i right at this point
? 

there're several point i don't quite understand ..

1, what's the difference between commit and flush  ?   i thought with these two method , i
could see the changes in my Directory without closing IndexWriter .

2, when should i close the writer ? if i use it Singleton(i don't have to worry about the
LockObtainException) , and i don't have to worry about the changes because commit and flush
would do this , then i don't have to close it any more ...
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