uschindler commented on pull request #2176:
URL: https://github.com/apache/lucene-solr/pull/2176#issuecomment-753512086


   FYI, after I was able to run tests in a more convenient way, I figured out 
that some tests fail from time to time because of using `HandleTrackingFS`. I 
disabled all custom filesystems in the PR, but it looks like some tests use 
`HandleTrackingFS`.
   
   I forgot to mention this in my description above: MMapDirectory no longer 
works with custom java.nio.filesystem.FileSystem, as it tries to cast the 
FileChannel internally (see JDK issue: 
https://bugs.openjdk.java.net/browse/JDK-8259028). For now we have to disable 
all custom file systems in our test suite until this bug is fixed.


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