lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Earwin Burrfoot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2376) java.lang.OutOfMemoryError:Java heap space
Date Sat, 10 Apr 2010 17:50:41 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12855615#action_12855615
] 

Earwin Burrfoot commented on LUCENE-2376:
-----------------------------------------

A field is basically an index in itself. As such, it has a bunch of bookkeeping data associated
with it, which is always loaded into memory, unlike field values, which are mostly kept to
disk. Also, like I explained in LUCENE-2361, field names are interned as they take part in
string comparisons very often internally.

So creating an insane amount of unique fields is like begging for either OOM or OOPermGen.
Can you elaborate, why do you need to store unique number in field name rather then field
value?


> 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

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: https://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

---------------------------------------------------------------------
To unsubscribe, e-mail: java-dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-dev-help@lucene.apache.org


Mime
View raw message