mikeplacko opened a new issue #494:
URL: https://github.com/apache/lucenenet/issues/494
I've got an odd file lock problem after updating from v3 to v4. I'm not sure
if this is just poor design choices or an actual issue but the behavior is
definitely different now.
Here is a simple scenario that seems like doesn't work how I think it
should.
1. Create an application that creates an IndexWriter using a path, add a
bunch of documents, and commit it. You should get some index files on disk at
that path.
2. Create a IIS website that opens an IndexReader using that same path and
IndexSearcher and then execute a search for one of those docs.
3. Go to disk and attempt to delete all the files lucene.net created in the
index path.
Expected behavior: the files are deleted
Actual behavior: some files are locked by the w3wp.exe process in IIS that
used the reader and cannot be deleted.
Negative side effect: if the writer runs again it can also run into this
issue where it can't update some of those files.
Workaround: dispose of the reader every time you search. Not necessarily a
bad thing, but uses more memory and is slower.
Why is the reader locking any files?
The reader is specifically a static variable created one time and disposed
on a timed basis for efficiency. My understanding is the reader is thread safe
and since we don't care about real-time updates, this is more efficient than
opening a new reader every time we do a search.
Posting the relevant code:
```
private static DirectoryReader _reader;
private static indexPath = @"C:\index\";
public void Search(){
if(_reader==null){
_reader = DirectoryReader.Open(FSDirectory.Open(new
DirectoryInfo(indexPath)), 8);
}
BooleanQuery mainQuery;
Sort sort;
IndexSearcher searcher = new IndexSearcher(_reader);
int numDocs = _reader.NumDocs;
var collector = TopFieldCollector.Create(sort, numDocs, true, true,
true, false);
searcher.Search(mainQuery, collector);
}
public void Index(){
IndexWriterConfig indexConfig = new
IndexWriterConfig(LuceneVersion.LUCENE_48, new
StandardAnalyzer(LuceneVersion.LUCENE_48));
var writer = new IndexWriter(FSDirectory.Open(indexPath), indexConfig)
var luceneDocument = new Lucene.Net.Documents.Document();
luceneDocument.Add(new TextField("DocumentId", "Unique ID",
Field.Store.YES));
writer.UpdateDocument(new Term("DocumentId", "Unique ID Here"),
luceneDocument);
writer.Commit();
}
```
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