Github user NicoK commented on a diff in the pull request: https://github.com/apache/flink/pull/5105#discussion_r156426879 --- Diff: flink-runtime/src/test/java/org/apache/flink/runtime/io/network/api/writer/RecordWriterTest.java --- @@ -155,13 +159,13 @@ public Void call() throws Exception { recordWriter.clearBuffers(); // Verify that buffer have been requested, but only one has been written out. - verify(bufferProvider, times(2)).requestBufferBlocking(); + verify(bufferProvider, times(2)).requestBufferBuilderBlocking(); verify(partitionWriter, times(1)).writeBuffer(any(Buffer.class), anyInt()); // Verify that the written out buffer has only been recycled once // (by the partition writer). - assertTrue("Buffer not recycled.", buffer.isRecycled()); - verify(buffer, times(1)).recycle(); + assertEquals(1, recycler.getRecycledMemorySegments().size()); + assertEquals(memorySegment, recycler.getRecycledMemorySegments().get(0)); --- End diff -- Of course if we used `TestPooledBufferProvider`, then we could only check the number of recycled memory segments here but isn't that enough since we do not use the recycler anywhere else?
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