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From "Danny Lade (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-3180) Can't delete a document using deleteDocument(int docID) if using IndexWriter AND IndexReader
Date Wed, 08 Jun 2011 07:09:58 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-3180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Danny Lade updated LUCENE-3180:
-------------------------------

    Attachment:     (was: ImpossibleLuceneCode.java)

> Can't delete a document using deleteDocument(int docID) if using IndexWriter AND IndexReader
> --------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3180
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3180
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: core/index
>    Affects Versions: 3.2
>         Environment: Windows 
>            Reporter: Danny Lade
>         Attachments: ImpossibleLuceneCode.java
>
>
> It is impossible to delete a document with "reader.deleteDocument(scoreDoc.doc)" yet.
> using:
>   Directory directory = FSDirectory.open(new File("lucene"));
>   
>   writer = new IndexWriter(directory, config);
>   reader = IndexReader.open(writer, true);
> results in:
>   Exception in thread "main" java.lang.UnsupportedOperationException: This IndexReader
cannot make any changes to the index (it was opened with readOnly = true)
>       at org.apache.lucene.index.ReadOnlySegmentReader.noWrite(ReadOnlySegmentReader.java:23)
>       at org.apache.lucene.index.ReadOnlyDirectoryReader.acquireWriteLock(ReadOnlyDirectoryReader.java:43)
>       at org.apache.lucene.index.IndexReader.deleteDocument(IndexReader.java:1067)
>       at de.morpheum.morphy.ImpossibleLuceneCode.main(ImpossibleLuceneCode.java:60)
> and using:
>   Directory directory = FSDirectory.open(new File("lucene"));
>   
>   writer = new IndexWriter(directory, config);
>   reader = IndexReader.open(directory, false);
>   
> results in:
>   org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@S:\Java\Morpheum\lucene\write.lock
>       at org.apache.lucene.store.Lock.obtain(Lock.java:84)
>       at org.apache.lucene.index.DirectoryReader.acquireWriteLock(DirectoryReader.java:765)
>       at org.apache.lucene.index.IndexReader.deleteDocument(IndexReader.java:1067)
>       at de.morpheum.morphy.ImpossibleLuceneCode.main(ImpossibleLuceneCode.java:69)
> A workaround is:
>   for (ScoreDoc scoreDoc : hits) {
>       Document document = reader.document(scoreDoc.doc);
>       writer.addDocument(document);
>   }
>   writer.deleteDocuments(query);
> But this is using the query twice and may result in inconsistent data (new added documents
may be removed also).
> On the other hand I can't use the "writer.deleteDocuments(query)" first because I need
the documents for some updates.

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