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https://issues.apache.org/jira/browse/LUCENE-7582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15724990#comment-15724990
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Uwe Schindler commented on LUCENE-7582:
---------------------------------------
Hi,
use FSDirectory.open static factory. It will choose the best implementation
automatically depending on Operating System. On Windows this will choose
MMapDircetory for 64 bit platforms and SimpleFSDirectory on 32 bit platforms.
This is perfectly fine. Keep in min that SImpleFSDirectory is not "slow" , it
just does not perform well in multithreaded environments (many parallel
searches). But on 32 bit platforms it is unlikely that you have many parallel
searches! 32 bit VMs are mostly used for stuff like local mail search engines
or other pure client/GUI apps.
Async FileChannel does not work and slows down immense for synchronous IO like
Lucene does, because you need additional client code synchronization. It gets
like 2 times slower than SimpleFSDirectory.
> NIOFSDirectory sometime doesn't work on windows
> -----------------------------------------------
>
> Key: LUCENE-7582
> URL: https://issues.apache.org/jira/browse/LUCENE-7582
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/store
> Affects Versions: 5.3.1
> Environment: Windows 10, 32 bits JVM
> Reporter: Kevin Senechal
>
> Hi!
> I've an error using lucene on windows. I already post a question on modeshape
> forum (https://developer.jboss.org/thread/273070) and it looks that
> NIOFSDirectory is not working well on windows as described in the java
> documentation of this class.
> {quote}NOTE: NIOFSDirectory is not recommended on Windows because of a bug in
> how FileChannel.read is implemented in Sun's JRE. Inside of the
> implementation the position is apparently synchronized. See here for
> details.{quote}
> After reading the linked java issue
> (http://bugs.java.com/bugdatabase/view_bug.do?bug_id=6265734), it seems that
> there is a workaround to solve it, use an AsynchronousFileChannel.
> Is it a choice that has been made to not use AsynchronousFileChannel or will
> it be a good fix?
> You'll find the complete stacktrace below:
> {code:java}
> Caused by: org.modeshape.jcr.index.lucene.LuceneIndexException: Cannot commit
> index writer
> at org.modeshape.jcr.index.lucene.LuceneIndex.commit(LuceneIndex.java:155)
> ~[dsdk-launcher.jar:na]
> at
> org.modeshape.jcr.spi.index.provider.IndexChangeAdapter.completeWorkspaceChanges(IndexChangeAdapter.java:104)
> ~[dsdk-launcher.jar:na]
> at
> org.modeshape.jcr.cache.change.ChangeSetAdapter.notify(ChangeSetAdapter.java:157)
> ~[dsdk-launcher.jar:na]
> at
> org.modeshape.jcr.spi.index.provider.IndexProvider$AtomicIndex.notify(IndexProvider.java:1493)
> ~[dsdk-launcher.jar:na]
> at
> org.modeshape.jcr.bus.RepositoryChangeBus.notify(RepositoryChangeBus.java:190)
> ~[dsdk-launcher.jar:na]
> at
> org.modeshape.jcr.cache.document.WorkspaceCache.changed(WorkspaceCache.java:333)
> ~[dsdk-launcher.jar:na]
> at
> org.modeshape.jcr.txn.SynchronizedTransactions.updateCache(SynchronizedTransactions.java:223)
> ~[dsdk-launcher.jar:na]
> at
> org.modeshape.jcr.cache.document.WritableSessionCache.save(WritableSessionCache.java:751)
> ~[dsdk-launcher.jar:na]
> at org.modeshape.jcr.JcrSession.save(JcrSession.java:1171)
> ~[dsdk-launcher.jar:na]
> ... 19 common frames omitted
> Caused by: java.nio.file.FileSystemException:
> C:\Users\Christopher\Infiltrea3CLOUDTEST8\[email protected]\indexes\default\nodesByPath\_dc_Lucene50_0.doc:
> The process cannot access the file because it is being used by another
> process.
> at
> sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:86)
> ~[na:1.8.0_92]
> at
> sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97)
> ~[na:1.8.0_92]
> at
> sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102)
> ~[na:1.8.0_92]
> at
> sun.nio.fs.WindowsFileSystemProvider.newFileChannel(WindowsFileSystemProvider.java:115)
> ~[na:1.8.0_92]
> at java.nio.channels.FileChannel.open(FileChannel.java:287) ~[na:1.8.0_92]
> at java.nio.channels.FileChannel.open(FileChannel.java:335) ~[na:1.8.0_92]
> at org.apache.lucene.util.IOUtils.fsync(IOUtils.java:393)
> ~[dsdk-launcher.jar:na]
> at org.apache.lucene.store.FSDirectory.fsync(FSDirectory.java:281)
> ~[dsdk-launcher.jar:na]
> at org.apache.lucene.store.FSDirectory.sync(FSDirectory.java:226)
> ~[dsdk-launcher.jar:na]
> at
> org.apache.lucene.store.LockValidatingDirectoryWrapper.sync(LockValidatingDirectoryWrapper.java:62)
> ~[dsdk-launcher.jar:na]
> at org.apache.lucene.index.IndexWriter.startCommit(IndexWriter.java:4456)
> ~[dsdk-launcher.jar:na]
> at
> org.apache.lucene.index.IndexWriter.prepareCommitInternal(IndexWriter.java:2874)
> ~[dsdk-launcher.jar:na]
> at
> org.apache.lucene.index.IndexWriter.commitInternal(IndexWriter.java:2977)
> ~[dsdk-launcher.jar:na]
> at org.apache.lucene.index.IndexWriter.commit(IndexWriter.java:2944)
> ~[dsdk-launcher.jar:na]
> at org.modeshape.jcr.index.lucene.LuceneIndex.commit(LuceneIndex.java:152)
> ~[dsdk-launcher.jar:na]
> {code}
> Thank you in advance for your help
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