[jira] [Created] (FLINK-15919) MemoryManager shouldn't allow releasing more memory than reserved

["Yu Li (Jira)" <ji...@apache.org>]

Yu Li created FLINK-15919:
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             Summary: MemoryManager shouldn't allow releasing more memory than reserved
                 Key: FLINK-15919
                 URL: https://issues.apache.org/jira/browse/FLINK-15919
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Task
    Affects Versions: 1.10.0
            Reporter: Yu Li


Currently {{MemoryManager}} allows releasing more memory than reserved for an owner object, which could be reproduced by adding below test case into {{MemoryManagerTest}}:

{code}
	@Test
	public void testMemoryReleaseGuard() throws MemoryReservationException {
		Object owner = new Object();
		Object owner2 = new Object();

		long totalHeapMemorySize = memoryManager.getMemorySizeByType(MemoryType.HEAP);
		memoryManager.reserveMemory(owner, MemoryType.HEAP, PAGE_SIZE);
		memoryManager.reserveMemory(owner2, MemoryType.HEAP, PAGE_SIZE);
		memoryManager.releaseMemory(owner, MemoryType.HEAP, PAGE_SIZE);
		memoryManager.releaseMemory(owner, MemoryType.HEAP, PAGE_SIZE);
		long heapMemoryLeft = memoryManager.getMemorySizeByType(MemoryType.HEAP);
		assertEquals("Memory leak happens", totalHeapMemorySize - PAGE_SIZE, heapMemoryLeft);
	}
{code}



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