wsry commented on a change in pull request #9993:
[FLINK-14498][runtime]Introduce NetworkBufferPool#isAvailable() for interacting
with LocalBufferPool.
URL: https://github.com/apache/flink/pull/9993#discussion_r340973400
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/buffer/NetworkBufferPool.java
##########
@@ -170,9 +180,13 @@ public void recycle(MemorySegment segment) {
throw new IllegalStateException("Buffer
pool is destroyed.");
}
- final MemorySegment segment =
availableMemorySegments.poll(2, TimeUnit.SECONDS);
- if (segment != null) {
- segments.add(segment);
+ synchronized (availabilityHelper) {
Review comment:
There can be deadlock if we sync on only one object. The buffer request
thread will first sync on the local pool and then on the global pool. The
buffer redistribution thread will first sync on the global pool and then on the
local pools.
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