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From "Danny Lade (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3180) Can't delete a document using deleteDocument(int docID) if using IndexWriter AND IndexReader
Date Wed, 08 Jun 2011 07:17:59 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045817#comment-13045817
] 

Danny Lade commented on LUCENE-3180:
------------------------------------

A workaround is:
{code:java}
  for (ScoreDoc scoreDoc : hits) {
      Document document = reader.document(scoreDoc.doc);

      writer.addDocument(document);
  }

  writer.deleteDocuments(query);
{code}

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.


> 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:
> {code:java}
> writer = new IndexWriter(directory, config);
> reader = IndexReader.open(writer, true);
> {code}
> results in:
> {code:java}
>   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)
> {code}
> and using:
> {code:java}
> writer = new IndexWriter(directory, config);
> reader = IndexReader.open(directory, false);
> {code}
>   
> results in:
> {code:java}
>   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)
> {code}

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