Github user NicoK commented on a diff in the pull request:
https://github.com/apache/flink/pull/4499#discussion_r136056661
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/RemoteInputChannel.java
---
@@ -72,6 +79,21 @@
*/
private int expectedSequenceNumber = 0;
+ /** The initial number of exclusive buffers assigned to this channel. */
+ private int initialCredit;
+
+ /** The current available exclusive buffers and requested floating
buffers from buffer pool. */
+ private final Queue<Buffer> availableBuffers = new ArrayDeque<>();
+
+ /** The number of available buffers that have not unannounced to
producer yet. */
+ private final AtomicInteger unannouncedCredit = new AtomicInteger(0);
+
+ /** The number of unsent buffers in producer's sub partition. */
+ private final AtomicInteger currentSenderBacklog = new AtomicInteger(0);
+
+ /** The tag indicates whether this channel is waiting additional
floating buffers from buffer pool. */
--- End diff --
`...waiting for additional floating buffers from the buffer pool`
---
