Stephen Green created LUCENE-6700:
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Summary: FSDirectory can't open indexes that are symlinks, due to
a deficiency in Files.createDirectories
Key: LUCENE-6700
URL: https://issues.apache.org/jira/browse/LUCENE-6700
Project: Lucene - Core
Issue Type: Bug
Components: core/index
Affects Versions: 5.0
Environment: java version "1.8.0_45"
Solaris or Linux
Symlinked directory
Reporter: Stephen Green
Priority: Minor
Lucene, using FSDirectory (via NIOFS directory) cannot open an index from a
Path that is a symbolic link to an actual index directory. Trying to do so
generates an exception stack like:
Exception in thread "main" java.nio.file.FileAlreadyExistsException: maildex.idx
at
sun.nio.fs.UnixException.translateToIOException(UnixException.java:88)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
at
sun.nio.fs.UnixFileSystemProvider.createDirectory(UnixFileSystemProvider.java:384)
at java.nio.file.Files.createDirectory(Files.java:674)
at java.nio.file.Files.createAndCheckIsDirectory(Files.java:781)
at java.nio.file.Files.createDirectories(Files.java:727)
at org.apache.lucene.store.FSDirectory.<init>(FSDirectory.java:128)
at org.apache.lucene.store.NIOFSDirectory.<init>(NIOFSDirectory.java:64)
at org.apache.lucene.store.NIOFSDirectory.<init>(NIOFSDirectory.java:74)
This problem occurs on both Linux and Solaris (which probably use the same SPI
for Unix file systems at the bottom of the java.nio.file stack.)
This problem has been noted in the OpenJDK issue tracker at:
https://bugs.openjdk.java.net/browse/JDK-8130464
And closed as "Not an Issue" because Files.createDirectories is meant to
operate on directories, and a symlink is not a directory. This doesn't strike
me as particularly helpful, but I guess is sort of makes sense in a
broken-by-design way.
The work-around is simply to move or copy the index to the place where I want
it, but this makes concurrent read-only development on the index difficult when
the index is large.
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