rmuir commented on pull request #128:
URL: https://github.com/apache/lucene/pull/128#issuecomment-850335925


   > The python tool looks very cool and thanks for testing it! One issue 
though is that this bit flipping is causing checksum integrity check failures 
before the concurrent segment part checks kick in, so it may not test the 
changes here? I think we may actually need to write a semantically buggy 
segment file with good checksum verification to see the error still gets 
detected and propagated correctly?
   
   This is also why checkindex has its `-fast` option, to only verify file 
checksums, which is probably what most end-users actually want when trying to 
verify that their index is intact and correct. The current (historical) slow 
defaults are really only useful for debugging a bug in lucene itself. And there 
is even a `-slow` that can do even more of that.


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