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Posted to dev@lucene.apache.org by "Uwe Schindler (JIRA)" <ji...@apache.org> on 2014/02/23 13:09:20 UTC
[jira] [Updated] (LUCENE-4864) Add AsyncFSDirectory to work around
Windows issues with NIOFS (Lucene 5.0 only)
[ https://issues.apache.org/jira/browse/LUCENE-4864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Uwe Schindler updated LUCENE-4864:
----------------------------------
Labels: Java7 (was: )
> Add AsyncFSDirectory to work around Windows issues with NIOFS (Lucene 5.0 only)
> -------------------------------------------------------------------------------
>
> Key: LUCENE-4864
> URL: https://issues.apache.org/jira/browse/LUCENE-4864
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/store
> Affects Versions: 5.0
> Reporter: Michael Poindexter
> Assignee: Uwe Schindler
> Labels: Java7
> Attachments: LUCENE-4864.patch, LUCENE-4864.patch
>
>
> On LUCENE-4848 a new directory implementation was proposed that uses AsyncFileChannel to make a sync-less directory implementation (only needed for IndexInput). The problem on Windows is that positional reads are impossible without overlapping (async) I/O, so FileChannel in the JDK has to syncronize all reads, because they consist of an atomic seek and atomic read.
> AsyncFSDirectoty would not have this issue, but has to take care of thread management, because you need a separate thread to get notified when the read is done. This involves overhead, but might still be better than the synchronization.
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