[#OPENJPA-71] Caching primitive array types consumes excessive memory

OpenJPA

Caching primitive array types consumes excessive memory

Created: 31/Oct/06 01:06 AM Updated: 09/Mar/07 11:11 AM

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Component/s:

datacache

Affects Version/s:

0.9.0, 0.9.6

Fix Version/s:

0.9.7

Time Tracking:

Not Specified

Resolution Date:

08/Mar/07 09:34 AM

Description

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As reported on the mailing list: http://www.nabble.com/cached-byte---consumes-excessive-memory-tf2543098.html , in org.apache.openjpa.AbstractPCData#toData() an ArrayList is used to cache all types of arrays, including arrays of primitives. This can use excessively large amounts of memory because of the wrappers required for each element in the array. In one test case, a 7MB byte[] consumed 127MB when converted to a cached ArrayList.

AbstractPCData needs to be fixed to handle simple arrays.

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Repository	Revision	Date	User	Message
ASF	#515987	Thu Mar 08 09:34:52 UTC 2007	pcl	~~OPENJPA-71~~: resolved inefficiency with array types and AbstractPCData
				Files Changed
				ADD /incubator/openjpa/trunk/openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/persistence/datacache/TestArrayFieldsInDataCache.java MODIFY /incubator/openjpa/trunk/openjpa-kernel/src/main/java/org/apache/openjpa/kernel/AbstractPCData.java MODIFY /incubator/openjpa/trunk/openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/persistence/test/SingleEMTest.java MODIFY /incubator/openjpa/trunk/openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/persistence/simple/AllFieldTypes.java MODIFY /incubator/openjpa/trunk/openjpa-persistence/src/main/java/org/apache/openjpa/persistence/PersistentCollection.java