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From Marc Sturlese <marc.sturl...@gmail.com>
Subject About IndexReader.reopen with very similar indexes
Date Mon, 20 Jun 2011 09:13:22 GMT
Hey there, 
I have a doubt about the behaviour of IndexReader.reopen.
I have a tomcat server holding a lucene index over an IndexSearcher. If I
move the index.folder to index.folder.old and another index, let's say
index.folder.2 to index.folder and then I reopen readers, something weird
happen if the first index and the second have very similar size and are
built from scratch. It seems that when I get the new reader and compare with
the new one:

 IndexReader reader = ... 
 ...
 IndexReader newReader = r.reopen();
 if (newReader != reader) {
 ...     // reader was reopened
   reader.close(); 
 }
 reader = newReader;
 ...

Lucene does not detect that are different indexes.
Here you can see both indexes (have same number of files and names are
similar, but sizes are a bit different, as contained documents are not
exactly the same).
*This does not happen if indexes have much more differents sizes (and so,
file names will not be equal, ex: _4.fdt, etc)
 
Index1:
-rw-r--r--   1 marc  admin  269289634 15 Jun 15:52 _3.fdt
-rw-r--r--   1 marc  admin    2066764 15 Jun 15:52 _3.fdx
-rw-r--r--   1 marc  admin        463 15 Jun 15:52 _3.fnm
-rw-r--r--   1 marc  admin   40358787 15 Jun 15:52 _3.frq
-rw-r--r--   1 marc  admin    1033384 15 Jun 15:52 _3.nrm
-rw-r--r--   1 marc  admin   27014923 15 Jun 15:52 _3.prx
-rw-r--r--   1 marc  admin     234797 15 Jun 15:52 _3.tii
-rw-r--r--   1 marc  admin   19322234 15 Jun 15:52 _3.tis
-rw-r--r--   1 marc  admin         20 15 Jun 15:52 segments.gen
-rw-r--r--   1 marc  admin        298 15 Jun 15:52 segments_2

Index2:
-rw-r--r--   1 marc  admin  269044254 15 Jun 15:52 _3.fdt
-rw-r--r--   1 marc  admin    2068116 15 Jun 15:52 _3.fdx
-rw-r--r--   1 marc  admin        463 15 Jun 15:52 _3.fnm
-rw-r--r--   1 marc  admin   40320465 15 Jun 15:52 _3.frq
-rw-r--r--   1 marc  admin    1034060 15 Jun 15:52 _3.nrm
-rw-r--r--   1 marc  admin   26967519 15 Jun 15:52 _3.prx
-rw-r--r--   1 marc  admin     235895 15 Jun 15:52 _3.tii
-rw-r--r--   1 marc  admin   19372446 15 Jun 15:52 _3.tis
-rw-r--r--   1 marc  admin         20 15 Jun 15:52 segments.gen
-rw-r--r--   1 marc  admin        298 15 Jun 15:52 segments_2

Can someone explain me the lucene criteria to decide if a segment has
changed or not?
Thanks in advance.


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