Our application is currently experiencing signs of a memory leak. We have
analyzed the heap dumps and have traced the largest block of memory back to a
HashMap in org.jboss.cache.TransactionTable.
I stepped through the code and found that on every put to the cache 2
transaction entries are written to the "txs" and "tx_map" but only 1 is
removed, leaking one entry per put. The entry which is leaked is initiated
from (TreeCache.put(Fqn, Object, Object) line: 3845). The entry which is
properly cleaned up is from (TxInterceptor.handleNonTxMethod(MethodCall) line:
361).
Here is the code used to do the cache put
| Option option = new Option();
| option.setFailSilently(true);
| Fqn keyFqn = new Fqn(new Object[]{this.regionFqn, key});
| cacheRegion.getCache().put(keyFqn, ITEM, value, option);
|
Environment: WebSphere 6.1 + JBC 1.4.1.SP4
Here is a relevant portion of the heap dump:
440,293,704 (43%) [7,600] 948 array of
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2ad66a9e68
| 2,019,968 (0%) [72] 3
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2ad4f95450
| 2,019,832 (0%) [112] 8 org/jboss/cache/OptimisticTransactionEntry
0x2ad4f94a50
| 64 (0%) [64] 2 org/jboss/cache/GlobalTransaction 0x2ad4f949e8
| 608 (0%) [304] 6 class
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x20d3500
| 1,722,808 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2af73f8eb8
| 1,435,344 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2af0e735d8
| 287,328 (0%) [112] 8 org/jboss/cache/OptimisticTransactionEntry
0x2af73f84b8
| 64 (0%) [64] 2 org/jboss/cache/GlobalTransaction 0x2af73f8450
| 608 (0%) [304] 6 class
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x20d3500
| 1,701,592 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2ae6e62bb8
| 1,616,768 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2ae4011d00
| 1,581,112 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2ac8576428
| 1,535,568 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2af4759d10
| 1,511,600 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2afb2b8468
| 1,482,928 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2af4aa4ff8
| 1,462,016 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2af53ac168
| 1,455,736 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2add5ee428
| 1,263,912 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2ab8b32dd0
| 1,249,912 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2ae51d9a60
| 1,245,624 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2af0ef8a20
| 1,237,912 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2aee239508
| 1,223,040 (0%) [72] 3
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2ade5f4ea0
| 1,218,040 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2aef3095c8
| 1,199,520 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2afe8d0880
| 1,169,392 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2b00dfd6d0
| 1,165,664 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2af05c79f0
| 1,151,128 (0%) [72] 4
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap$Entry 0x2ac35487b8
| There are 928 more children
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