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https://issues.apache.org/jira/browse/LUCENENET-186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12739667#action_12739667
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Digy commented on LUCENENET-186:
--------------------------------
LUCENENET-168 ok.
DIGY
> Lucene.Net 2.4.0 - Status/Todo (all in one place)
> -------------------------------------------------
>
> Key: LUCENENET-186
> URL: https://issues.apache.org/jira/browse/LUCENENET-186
> Project: Lucene.Net
> Issue Type: Bug
> Reporter: Digy
>
> The following is my understanding of the current status and remaining work to
> be done on the 2.4.0 port:
> 1) Lucene.Net.Util.CloseableThreadLocal
> - Needs WeakReferences wrapping thread-local data.
> 2)
> Lucene.Net.Search.TimeLimitedCollector/Lucene.Net.Search.TestTimeLimitedCollector
> - Unit tests are failing, requires investigation and bugfix
> 3) File Descriptor syncing in FSDirectory.cs
> FSDirectory.Sync(string) is supposed to sync the underlying file descriptor,
> flushing all downstream buffers. I'm not sure how to accomplish this is C#,
> and this code needs to be reviewed/fixed/nuked.
> Digy suggests the following code fix:
> [System.Runtime.InteropServices.DllImport("kernel32")]
> public static extern int
> FlushFileBuffers(Microsoft.Win32.SafeHandles.SafeFileHandle
> SafeFileHandle);
> public static void Sync(FileStream fs)
> {
> if (FlushFileBuffers(fs.SafeFileHandle) == 0)
> {
> throw new SyncFailedException();
> }
> }
> public class SyncFailedException : Exception
> {
> }
> 4) Weak References in Caches
> Lucene.Net.Search.CachingSpanFilter.cs
> Lucene.Net.Search.CachingWrapperFilter.cs
> Lucene.Net.Search.FieldCacheImpl.cs
> - Lucene Java utilizes java.util.WeakHashMap
> - Lucene.Net is not using a data structure with weak references
> Per Digy:
> "WeakHashTable(implemented in SupportClass) was used in FieldCacheImpl,
> CachingSpanFilter, CachingWrapperFilter in v2.3.2 because HashTable had
> caused memory leak (http://issues.apache.org/jira/browse/LUCENENET-106). But
> as I said before, some patches made to Lucene.Net 2.3.2(2.3.1?) are lost with
> your new 2.4.0"
> WeakHashTable needs to be recovered from the 2.3.2 SupportClass and
> integrated into the 2.4.0 SupportClass. FieldCacheImpl, CachingSpanFilter,
> and CachingWrapperFilter need to be updated to utilize WeakHashTable.
> 5) Implement Lucene.Net.Store.NIOFSDirectory.cs
> (org.apache.lucene.store.NIOFSDirectory.java)
> Me (from a few days ago):
> "This is a Java subclass of FSDirectory that allows multiple threads to read
> from a single file without blocking each other. Write behavior is inherited
> from FSDirectory. If anyone would like to take a stab at this, please be my
> guest."
> I'm not sure that this is a necessary component for moving forward with the
> 2.4.0 release, but if someone comes up with an implementation that performs
> better than FSDirectory, of course we would be interested.
> 6+) Per Digy: "Here is a list of lost bug fixes/improvements with v2.4.0"
> LUCENENET-183
> LUCENENET-182
> LUCENENET-175
> LUCENENET-174
> LUCENENET-170
> LUCENENET-169
> LUCENENET-168
> LUCENENET-163
> LUCENENET-160
> LUCENENET-159
> LUCENENET-106 (This is the #4, above)
> This list needs to be traversed and ported when/where necessary.
> Thanks,
> Doug
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