on JDK 1.4.2 Lucene 1.4.1 really seems to run fine: just a moderate number of SegmentTermEnums that is controlled by gc (about 500 for the 1900 test objects).
Daniel Taurat wrote:
Hi Doug,
you are absolutely right about the older version of the JDK: it is 1.3.1 (ibm).
Unfortunately we cannot upgrade since we are bound to IBM Portalserver 4 environment.
Results:
I patched the Lucene1.4.1:
it has improved not much: after indexing 1897 Objects the number of SegmentTermEnum is up to 17936.
To be realistic: This is even a deterioration :(((
My next check will be with a JDK1.4.2 for the test environment, but this can only be a reference run for now.
Thanks, Daniel
Doug Cutting wrote:
It sounds like the ThreadLocal in TermInfosReader is not getting correctly garbage collected when the TermInfosReader is collected. Researching a bit, this was a bug in JVMs prior to 1.4.2, so my guess is that you're running in an older JVM. Is that right?
I've attached a patch which should fix this. Please tell me if it works for you.
Doug
Daniel Taurat wrote:
Okay, that (1.4rc3)worked fine, too! Got only 257 SegmentTermEnums for 1900 objects.
Now I will go for the final test on the production server with the 1.4rc3 version and about 40.000 objects.
Daniel
Daniel Taurat schrieb:
Hi all,
here is some update for you:
I switched back to Lucene 1.3-final and now the number of the SegmentTermEnum objects is controlled by gc again:
it goes up to about 1000 and then it is down again to 254 after indexing my 1900 test-objects.
Stay tuned, I will try 1.4RC3 now, the last version before FieldCache was introduced...
Daniel
Rupinder Singh Mazara schrieb:
hi all
I had a similar problem, i have database of documents with 24 fields, and a average content of 7K, with 16M+ records
i had to split the jobs into slabs of 1M each and merging the resulting indexes, submissions to our job queue looked like
java -Xms100M -Xcompactexplicitgc -cp $CLASSPATH lucene.Indexer 22
and i still had outofmemory exception , the solution that i created was to after every 200K, documents create a temp directory, and merge them together, this was done to do the first production run, updates are now being handled incrementally
Exception in thread "main" java.lang.OutOfMemoryError
at org.apache.lucene.store.RAMOutputStream.flushBuffer(RAMOutputStream.java(Compiled Code))
at org.apache.lucene.store.OutputStream.flush(OutputStream.java(Inlined Compiled Code))
at org.apache.lucene.store.OutputStream.writeByte(OutputStream.java(Inlined Compiled Code))
at org.apache.lucene.store.OutputStream.writeBytes(OutputStream.java(Compiled Code))
at org.apache.lucene.index.CompoundFileWriter.copyFile(CompoundFileWriter.java(Compiled Code))
at org.apache.lucene.index.CompoundFileWriter.close(CompoundFileWriter.java(Compiled Code))
at org.apache.lucene.index.SegmentMerger.createCompoundFile(SegmentMerger.java(Compiled Code))
at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java(Compiled Code))
at org.apache.lucene.index.IndexWriter.mergeSegments(IndexWriter.java(Compiled Code))
at org.apache.lucene.index.IndexWriter.optimize(IndexWriter.java:366)
at lucene.Indexer.doIndex(CDBIndexer.java(Compiled Code))
at lucene.Indexer.main(CDBIndexer.java:168)
-----Original Message-----
From: Daniel Taurat [mailto:[EMAIL PROTECTED]
Sent: 10 September 2004 14:42
To: Lucene Users List
Subject: Re: Out of memory in lucene 1.4.1 when re-indexing large number
of documents
Hi Pete,
good hint, but we actually do have physical memory of 4Gb on the system. But then: we also have experienced that the gc of ibm jdk1.3.1 that we use is sometimes
behaving strangely with too large heap space anyway. (Limit seems to be 1.2 Gb)
I can say that gc is not collecting these objects since I forced gc runs when indexing every now and then (when parsing pdf-type objects, that is): No effect.
regards,
Daniel
Pete Lewis wrote:
Hi all
Reading the thread with interest, there is another way I've come
across out
of memory errors when indexing large batches of documents.
If you have your heap space settings too high, then you get
swapping (which
impacts performance) plus you never reach the trigger for garbage
collection, hence you don't garbage collect and hence you run out
of memory.
Can you check whether or not your garbage collection is being triggered?
Anomalously therefore if this is the case, by reducing the heap space you
can improve performance get rid of the out of memory errors.
Cheers Pete Lewis
----- Original Message ----- From: "Daniel Taurat" <[EMAIL PROTECTED]>
To: "Lucene Users List" <[EMAIL PROTECTED]>
Sent: Friday, September 10, 2004 1:10 PM
Subject: Re: Out of memory in lucene 1.4.1 when re-indexing large
number of
about filesdocuments
Daniel Aber schrieb:
On Thursday 09 September 2004 19:47, Daniel Taurat wrote:
I am facing an out of memory problem using Lucene 1.4.1.
Could you try with a recent CVS version? There has been a fix
not being deleted after 1.4.1. Not sure if that could cause the problems
you're experiencing.
Regards Daniel
Well, it seems not to be files, it looks more like those SegmentTermEnum
objects accumulating in memory.
#I've seen some discussion on these objects in the developer-newsgroup
that had taken place some time ago.
I am afraid this is some kind of runaway caching I have to deal with.
Maybe not correctly addressed in this newsgroup, after all...
Anyway: any idea if there is an API command to re-init caches?
Thanks,
Daniel
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Index: src/java/org/apache/lucene/index/TermInfosReader.java
===================================================================
RCS file: /home/cvs/jakarta-lucene/src/java/org/apache/lucene/index/TermInfosReader.java,v
retrieving revision 1.9
diff -u -r1.9 TermInfosReader.java
--- src/java/org/apache/lucene/index/TermInfosReader.java 6 Aug 2004 20:50:29 -0000 1.9
+++ src/java/org/apache/lucene/index/TermInfosReader.java 10 Sep 2004 17:46:47 -0000
@@ -45,6 +45,11 @@
readIndex();
}
+ protected final void finalize() { + // patch for pre-1.4.2 JVMs, whose ThreadLocals leak + enumerators.set(null); + } + public int getSkipInterval() { return origEnum.skipInterval; }
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