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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624988#action_12624988
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Matthew Mastracci commented on LUCENE-753:
------------------------------------------
This exception popped up out of the blue a few hours in. No exceptions before
it. I'll see if I can figure out whether it was caused by our index
snapshotting or if it's a bug elsewhere in NIOFSDirectory.
I haven't seen any exceptions like this with MMapDirectory, but it's possible
there's something that we're doing that isn't correct.
{noformat}
Caused by: java.nio.channels.ClosedChannelException
at sun.nio.ch.FileChannelImpl.ensureOpen(FileChannelImpl.java:91)
at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:616)
at
com.dotspots.analyzer.index.NIOFSDirectory$NIOFSIndexInput.read(NIOFSDirectory.java:186)
at
com.dotspots.analyzer.index.NIOFSDirectory$NIOFSIndexInput.refill(NIOFSDirectory.java:218)
at
com.dotspots.analyzer.index.NIOFSDirectory$NIOFSIndexInput.readByte(NIOFSDirectory.java:232)
at org.apache.lucene.store.IndexInput.readVInt(IndexInput.java:76)
at org.apache.lucene.index.TermBuffer.read(TermBuffer.java:63)
at
org.apache.lucene.index.SegmentTermEnum.next(SegmentTermEnum.java:123)
at
org.apache.lucene.index.SegmentTermEnum.scanTo(SegmentTermEnum.java:154)
at
org.apache.lucene.index.TermInfosReader.scanEnum(TermInfosReader.java:223)
at org.apache.lucene.index.TermInfosReader.get(TermInfosReader.java:217)
at org.apache.lucene.index.SegmentReader.docFreq(SegmentReader.java:678)
at
org.apache.lucene.index.MultiSegmentReader.docFreq(MultiSegmentReader.java:373)
at org.apache.lucene.index.MultiReader.docFreq(MultiReader.java:310)
at org.apache.lucene.search.IndexSearcher.docFreq(IndexSearcher.java:87)
at org.apache.lucene.search.Searcher.docFreqs(Searcher.java:178)
{noformat}
> Use NIO positional read to avoid synchronization in FSIndexInput
> ----------------------------------------------------------------
>
> Key: LUCENE-753
> URL: https://issues.apache.org/jira/browse/LUCENE-753
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Store
> Reporter: Yonik Seeley
> Assignee: Michael McCandless
> Fix For: 2.4
>
> Attachments: FileReadTest.java, FileReadTest.java, FileReadTest.java,
> FileReadTest.java, FileReadTest.java, FileReadTest.java, FileReadTest.java,
> FSDirectoryPool.patch, FSIndexInput.patch, FSIndexInput.patch,
> LUCENE-753.patch, lucene-753.patch, lucene-753.patch
>
>
> As suggested by Doug, we could use NIO pread to avoid synchronization on the
> underlying file.
> This could mitigate any MT performance drop caused by reducing the number of
> files in the index format.
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