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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/02/05 13:32:37 UTC
[GitHub] [flink] tillrohrmann commented on a change in pull request #11025:
[FLINK-15919][core][mem] MemoryManager shouldn't allow releasing more
memory than reserved
tillrohrmann commented on a change in pull request #11025: [FLINK-15919][core][mem] MemoryManager shouldn't allow releasing more memory than reserved
URL: https://github.com/apache/flink/pull/11025#discussion_r375248142
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File path: flink-runtime/src/test/java/org/apache/flink/runtime/memory/MemoryManagerTest.java
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@@ -264,6 +265,30 @@ public void testMemoryReservation() throws MemoryReservationException {
memoryManager.releaseAllMemory(owner, MemoryType.OFF_HEAP);
}
+ @Test
+ public void testMemoryReleaseMoreThanReserved() throws MemoryReservationException {
+ Object owner = new Object();
+ Object owner2 = new Object();
+ long totalHeapMemorySize = memoryManager.availableMemory(MemoryType.HEAP);
+ // to prevent memory size exceeding the maximum, reserve some memory from another owner.
+ memoryManager.reserveMemory(owner2, MemoryType.HEAP, PAGE_SIZE);
+
+ // test reserve once and release multiple times
+ memoryManager.reserveMemory(owner, MemoryType.HEAP, PAGE_SIZE);
+ memoryManager.releaseMemory(owner, MemoryType.HEAP, PAGE_SIZE);
+ memoryManager.releaseMemory(owner, MemoryType.HEAP, PAGE_SIZE);
+ long heapMemoryLeft = memoryManager.availableMemory(MemoryType.HEAP);
+ assertEquals("Memory leak happens", totalHeapMemorySize - PAGE_SIZE, heapMemoryLeft);
+
+ // test release more than the left reserved size
+ memoryManager.reserveMemory(owner, MemoryType.HEAP, PAGE_SIZE);
+ memoryManager.releaseMemory(owner, MemoryType.HEAP, PAGE_SIZE / 2);
+ memoryManager.releaseMemory(owner, MemoryType.HEAP, PAGE_SIZE);
+ heapMemoryLeft = memoryManager.availableMemory(MemoryType.HEAP);
+ assertEquals("Memory leak happens", totalHeapMemorySize - PAGE_SIZE, heapMemoryLeft);
+ memoryManager.releaseAllMemory(owner2, MemoryType.HEAP);
Review comment:
I'd suggest to create a separate test for this part.
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