wcarlson5 commented on a change in pull request #9863:
URL: https://github.com/apache/kafka/pull/9863#discussion_r555320421
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File path: streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java
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@@ -249,20 +249,31 @@ public boolean isValidTransition(final State newState) {
private boolean waitOnState(final State targetState, final long waitMs) {
final long begin = time.milliseconds();
synchronized (stateLock) {
+ boolean interrupted = false;
long elapsedMs = 0L;
- while (state != targetState) {
- if (waitMs > elapsedMs) {
- final long remainingMs = waitMs - elapsedMs;
- try {
- stateLock.wait(remainingMs);
- } catch (final InterruptedException e) {
- // it is ok: just move on to the next iteration
+ try {
+ while (state != targetState) {
+ if (waitMs > elapsedMs) {
+ final long remainingMs = waitMs - elapsedMs;
+ try {
+ stateLock.wait(remainingMs);
+ } catch (final InterruptedException e) {
+ interrupted = true;
+ }
+ } else {
+ log.debug("Cannot transit to {} within {}ms",
targetState, waitMs);
+ return false;
}
- } else {
- log.debug("Cannot transit to {} within {}ms", targetState,
waitMs);
- return false;
+ elapsedMs = time.milliseconds() - begin;
+ }
+ } finally {
+ // Make sure to restore the interruption status before
returning.
+ // We do not always own the current thread that executes this
method, i.e., we do not know the
+ // interruption policy of the thread. The least we can do is
restore the interruption status before
+ // the current thread exits this method.
+ if (interrupted) {
+ Thread.currentThread().interrupt();
Review comment:
I thought it was to break threads out loops, I don't know if the flag is
actually checked. So will passing it up be useful if the don't retrun
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