Github user NicoK commented on a diff in the pull request:
https://github.com/apache/flink/pull/4485#discussion_r138889161
--- Diff:
flink-runtime/src/test/java/org/apache/flink/runtime/io/network/buffer/NetworkBufferPoolTest.java
---
@@ -172,44 +178,117 @@ public void testDestroyAll() {
}
}
+ /**
+ * Tests {@link NetworkBufferPool#requestMemorySegments(int)} with the
{@link NetworkBufferPool}
+ * currently containing the number of required free segments.
+ */
@Test
- public void testRequestAndRecycleMemorySegments() throws Exception {
+ public void testRequestMemorySegmentsLessThanTotalBuffers() throws
Exception {
final int numBuffers = 10;
NetworkBufferPool globalPool = new
NetworkBufferPool(numBuffers, 128, MemoryType.HEAP);
- List<MemorySegment> segments = null;
- // request buffers from global pool with illegal argument
+ List<MemorySegment> memorySegments = Collections.emptyList();
try {
- segments = globalPool.requestMemorySegments(0);
- fail("Should throw an IllegalArgumentException");
- } catch (IllegalArgumentException e) {
- assertNull(segments);
+ memorySegments =
globalPool.requestMemorySegments(numBuffers / 2);
+
+ assertEquals(memorySegments.size(), numBuffers / 2);
+ } finally {
+ globalPool.recycleMemorySegments(memorySegments);
assertEquals(globalPool.getNumberOfAvailableMemorySegments(), numBuffers);
}
+ }
- // common case to request buffers less than the total capacity
of global pool
- final int numRequiredBuffers = 8;
- segments = globalPool.requestMemorySegments(numRequiredBuffers);
-
- assertNotNull(segments);
- assertEquals(segments.size(), numRequiredBuffers);
-
- // recycle all the requested buffers to global pool
- globalPool.recycleMemorySegments(segments);
+ /**
+ * Tests {@link NetworkBufferPool#requestMemorySegments(int)} with the
number of required
+ * buffers exceeding the capacity of {@link NetworkBufferPool}.
+ */
+ @Test
+ public void testRequestMemorySegmentsMoreThanTotalBuffers() throws
Exception {
+ final int numBuffers = 10;
- assertEquals(globalPool.getNumberOfAvailableMemorySegments(),
numBuffers);
+ NetworkBufferPool globalPool = new
NetworkBufferPool(numBuffers, 128, MemoryType.HEAP);
- // uncommon case to request buffers exceeding the total
capacity of global pool
+ List<MemorySegment> memorySegments = Collections.emptyList();
try {
- segments = null;
- segments = globalPool.requestMemorySegments(11);
+ memorySegments =
globalPool.requestMemorySegments(numBuffers + 1);
fail("Should throw an IOException");
} catch (IOException e) {
- assertNull(segments);
- // recycle all the requested buffers to global pool
after exception
+ assertEquals(memorySegments.size(), 0);
assertEquals(globalPool.getNumberOfAvailableMemorySegments(), numBuffers);
}
--- End diff --
add `finally`with `globalPool.destroy()`
---
