Re: [CLucene-dev] Bug in SegmentMerger and IndexWriter

[Šplíchal J. <spl...@to...>]

Hi Ben,

We are using slightly different version but I tested the issue with
sources from origin/master and also from origin/vc6-fixes-working
and the test crashes as described in all the cases - at least in debug version.
But we found the issue when using release version.
I am using VS2005 on Windows 7.

Jiri


From: Ben van Klinken [mailto:bva...@gm...]
Sent: Friday, April 13, 2012 12:50 AM
To: clu...@li...
Subject: Re: [CLucene-dev] Bug in SegmentMerger and IndexWriter

Hi Jiri,

What branch are you using? I just tried compiling and running that test and it ran without any issues

ben
2012/4/12 Šplíchal Jiří <spl...@to...<mailto:spl...@to...>>
Hello,

please find attached TestIndexWriter.cpp extended with one more test that
shows two different bugs:
1) If you leave the test as it is, than it crashes on line 680 when optimizing an index that
was previously empty (all documents were deleted) and then some documents has been added.
We were able to fix this bug, the problem is in SegmentMerger.cpp 769 where
         reader->norms(fi->name, normBuffer.values);
is called with normBuffer.values == NULL.
To prevent this it is sufficient to initialize the normBuffer at the beginning of the method
with length 1.

2) If you uncomment writer->optimize(); on line 660 in the test, than the following call to
writer->close(); crashes. We have not found any solution for this issue where we could be
sure about all consequences. But the problematic method in this case is
bool IndexWriter::flushDocStores()
which intializes a local variable files by calling:
       const std::vector<std::string>& files = docWriter->files();
but the following calls have as side effect modification of this vector in such way
that the application crashes.

Best Regards,
Jiri


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