zhijiangW 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_r340445716
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/buffer/LocalBufferPool.java
##########
@@ -269,6 +267,17 @@ private MemorySegment requestMemorySegmentFromGlobal()
throws IOException {
if (segment != null) {
numberOfRequestedMemorySegments++;
return segment;
+ } else if (isBlocking) {
+ // if the future is completed before the
callback is registered,
+ // the request thread will wait 2s before
polling an available
+ // segment from the global pool, which is not a
big problem.
+ networkBufferPool.isAvailable().thenRun(() -> {
+ if
(!Thread.holdsLock(availableMemorySegments)) {
+ synchronized
(availableMemorySegments) {
+
availableMemorySegments.notifyAll();
Review comment:
Use availableMemorySegments.notify() instead?
There was only one thread waiting and in `LocalBufferPool#recycle` it also
use `notify`.
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