dugenkui03 commented on a change in pull request #13277:
URL: https://github.com/apache/flink/pull/13277#discussion_r481163983
##########
File path:
flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/internals/ClosableBlockingQueue.java
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@@ -176,17 +178,17 @@ public boolean close() {
public boolean addIfOpen(E element) {
requireNonNull(element);
- lock.lock();
+ writeLock.lock();
try {
if (open) {
elements.addLast(element);
if (elements.size() == 1) {
- nonEmpty.signalAll();
+ nonEmpty.signal();
Review comment:
`signal()` is safe and reasonable, since all the threads which waiting
on the `nonEmpty` Condition wish to take element from queue, and at most one
thread can get element from queue.
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