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From Rahil <qam...@cs.man.ac.uk>
Subject OutOfMemory and IOException Access Denied errors
Date Fri, 19 May 2006 12:27:55 GMT
  Hi

I am new to Lucene so am perhaps missing something obvious. I have 
included Lucene 1.9.1 in my classpath and am trying to integrate it with 
MySQL.

I have a table which has near a million records in it. According to the 
documentation on Lucene I have read so far, my understanding is that I 
need to (1) make a connection with MySQL then (2) execute the query 
normally in SQL syntax. (3) Then pass the ResultSet to the method to 
create indexes. (4) I can then pass a queryString to the searchIndex() 
custom method to locate the queryString.

PROBLEMS:

(a) The first problem I had was when trying to execute the query on the 
million records table in Step 1. It resulted in an OutOfMemory error due 
to the size of the table. How can I get around this problem so that the 
query executes on the entire table at one time?

As a workaround, I limited the number of results to 100,000 which worked 
fine.

(b) But I then received an IOException when the index was being written 
to the Document object. The Exception stack trace is shown below:

---
Exception in thread "main" java.io.IOException: Access is denied
at java.io.WinNTFileSystem.createFileExclusively(Native Method)
at java.io.File.createNewFile(File.java:850)
at org.apache.lucene.store.FSDirectory$1.obtain(FSDirectory.java:324)
at org.apache.lucene.store.Lock.obtain(Lock.java:92)
at org.apache.lucene.store.Lock$With.run(Lock.java:147)
at org.apache.lucene.index.IndexWriter.mergeSegments(IndexWriter.java:442)
at 
org.apache.lucene.index.IndexWriter.maybeMergeSegments(IndexWriter.java:401)
at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:260)
at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:244)
at man.ac.uk.most.LuceneIndex.indexResultSet(LuceneIndex.java:102) --- 
error line in my piece of code !
at man.ac.uk.most.LuceneIndex.main(LuceneIndex.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:78)

---

Line 102 is present in the block of code in my program as such

----
while(rs.next()){
lucDoc = new Document();
lucDoc.add(Field.Keyword("conceptId",rs.getString("CONCEPTID")));
lucDoc.add(Field.Text("term",rs.getString("TERM")));
lucDoc.add(Field.UnIndexed("descriptionType",rs.getString("DESCRIPTIONTYPE")));

indexWriter.addDocument(lucDoc); --- problem line 102
}

rs.close();
closeIndexWriter();


----

If I limit Step 1 to execute 10000 records then the program runs fine 
and theres no problem. However I need to index the entire table either 
as a single query or an incremental query.

Can someone please help me with these problems.

Thanks
Rahil

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