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https://issues.apache.org/jira/browse/CMIS-868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14212222#comment-14212222
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Florian Müller commented on CMIS-868:
-------------------------------------
How many types do you have in your repository and how big is your type
definition cache (session parameter CACHE_SIZE_TYPES)?
> OOM issue when run concurrent test on GetDescendant, GetTypeFlat, GetTypeTree.
> ------------------------------------------------------------------------------
>
> Key: CMIS-868
> URL: https://issues.apache.org/jira/browse/CMIS-868
> Project: Chemistry
> Issue Type: Bug
> Components: opencmis-client
> Affects Versions: OpenCMIS 0.12.0
> Environment: AIX 7.1+Websphere ND 8.5.5.3
> Java(TM) SE Runtime Environment (build
> pap6460_26sr2ifix-20120419_02(SR2+IV19661))
> IBM J9 VM (build 2.6, JRE 1.6.0 AIX ppc64-64 20120322_106210 (JIT enabled,
> AOT enabled)
> J9VM - R26_Java626_SR2_20120322_1722_B106210
> JIT - r11_20120322_22976
> GC - R26_Java626_SR2_20120322_1722_B106210
> J9CL - 20120322_106210)
> JCL - 20120316_01
> Reporter: Yi Wang
> Priority: Critical
> Attachments: heapdump.20141111.151212.10223668.0002.zip.001,
> heapdump.20141111.151212.10223668.0002.zip.002,
> heapdump.20141111.151212.10223668.0002.zip.003,
> heapdump.20141111.151212.10223668.0002.zip.004,
> javacore.20141111.151212.10223668.0003.txt
>
>
> When I run concurrent test with 100 threads on GetDescendants, GetTypeTree,
> GetTypeFlat function.
> I found there are many hashtable objects(>500MB) saved in heap after analyzed
> heap dump. I found there was one line(red line below) in
> convertTypeDefinition method that chemistry used typeDefinition object as the
> key of HashMap. However, JAVA does not think 2 typeDefinition objects are
> same objects although the value of typeDefinition members are same. I debug
> to this line, the "result" variable always was "null". It made the
> objectTypecache larger and larger when run concurrent test.
> private ObjectType convertTypeDefinition(TypeDefinition typeDefinition) {
> lock.writeLock().lock();
> try {
> ObjectType result = null;
> if (objectTypeCache == null) {
> objectTypeCache = new IdentityHashMap<TypeDefinition,
> ObjectType>();
> } else {
> result = objectTypeCache.get(typeDefinition);
> }
> if (result == null) {
> result = objectFactory.convertTypeDefinition(typeDefinition);
> objectTypeCache.put(typeDefinition, result);
> }
> return result;
> } finally {
> lock.writeLock().unlock();
> }
> }
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