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https://issues.apache.org/jira/browse/LUCENE-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12855548#action_12855548
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Michael McCandless commented on LUCENE-2376:
--------------------------------------------
Yes total unique fields are 4 in that case. I suspect it's the fields like
Cor414D5120514D475231202020202020204A94834B21C22E6E that are causing your
problems.
> java.lang.OutOfMemoryError:Java heap space
> ------------------------------------------
>
> Key: LUCENE-2376
> URL: https://issues.apache.org/jira/browse/LUCENE-2376
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.9.1
> Environment: Windows
> Reporter: Shivender Devarakonda
> Attachments: CheckIndex_JavaHeapOOM.txt,
> CheckIndex_PermGenSpaceOOM.txt, InfoStreamOutput.txt
>
>
> I see an OutOfMemory error in our product and it is happening when we have
> some data objects on which we built the index. I see the following
> OutOfmemory error, this is happening after we call Indexwriter.optimize():
> 4/06/10 02:03:42.160 PM PDT [ERROR] [Lucene Merge Thread #12] In thread
> Lucene Merge Thread #12 and the message is
> org.apache.lucene.index.MergePolicy$MergeException:
> java.lang.OutOfMemoryError: Java heap space
> 4/06/10 02:03:42.207 PM PDT [VERBOSE] [Lucene Merge Thread #12] [Manager]
> Uncaught Exception in thread Lucene Merge Thread #12
> org.apache.lucene.index.MergePolicy$MergeException:
> java.lang.OutOfMemoryError: Java heap space
> at
> org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:351)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:315)
> Caused by: java.lang.OutOfMemoryError: Java heap space
> at java.util.HashMap.resize(HashMap.java:462)
> at java.util.HashMap.addEntry(HashMap.java:755)
> at java.util.HashMap.put(HashMap.java:385)
> at org.apache.lucene.index.FieldInfos.addInternal(FieldInfos.java:256)
> at org.apache.lucene.index.FieldInfos.read(FieldInfos.java:366)
> at org.apache.lucene.index.FieldInfos.<init>(FieldInfos.java:71)
> at
> org.apache.lucene.index.SegmentReader$CoreReaders.<init>(SegmentReader.java:116)
> at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:638)
> at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:608)
> at
> org.apache.lucene.index.IndexWriter$ReaderPool.get(IndexWriter.java:686)
> at
> org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4979)
> at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4614)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:235)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:291)
> 4/06/10 02:03:42.895 PM PDT [ERROR] this writer hit an OutOfMemoryError;
> cannot complete optimize
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