wcarlson5 commented on a change in pull request #9984:
URL: https://github.com/apache/kafka/pull/9984#discussion_r565784940
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File path: streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java
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@@ -997,19 +1002,63 @@ private StreamThread createAndAddStreamThread(final long
cacheSizePerThread, fin
* no stream threads are alive
*/
public Optional<String> removeStreamThread() {
+ return removeStreamThread(Long.MAX_VALUE);
+ }
+
+ /**
+ * Removes one stream thread out of the running stream threads from this
Kafka Streams client.
+ * <p>
+ * The removed stream thread is gracefully shut down. This method does not
specify which stream
+ * thread is shut down.
+ * <p>
+ * Since the number of stream threads decreases, the sizes of the caches
in the remaining stream
+ * threads are adapted so that the sum of the cache sizes over all stream
threads equals the total
+ * cache size specified in configuration {@link
StreamsConfig#CACHE_MAX_BYTES_BUFFERING_CONFIG}.
+ *
+ * @param timeout The the length of time to wait for the thread to shutdown
+ * @throws TimeoutException if the thread does not stop in time
+ * @return name of the removed stream thread or empty if a stream thread
could not be removed because
+ * no stream threads are alive
+ */
+ public Optional<String> removeStreamThread(final Duration timeout) throws
TimeoutException {
+ final String msgPrefix = prepareMillisCheckFailMsgPrefix(timeout,
"timeout");
+ final long timeoutMs = validateMillisecondDuration(timeout, msgPrefix);
+ return removeStreamThread(timeoutMs);
+ }
+
+ private Optional<String> removeStreamThread(final long timeoutMs) throws
TimeoutException {
+ final long begin = time.milliseconds();
if (isRunningOrRebalancing()) {
synchronized (changeThreadCount) {
// make a copy of threads to avoid holding lock
for (final StreamThread streamThread : new
ArrayList<>(threads)) {
if (streamThread.isAlive() &&
(!streamThread.getName().equals(Thread.currentThread().getName())
|| threads.size() == 1)) {
+ final Optional<String> groupInstanceID =
streamThread.getGroupInstanceID();
streamThread.shutdown();
if
(!streamThread.getName().equals(Thread.currentThread().getName())) {
-
streamThread.waitOnThreadState(StreamThread.State.DEAD);
+ if
(!streamThread.waitOnThreadState(StreamThread.State.DEAD, timeoutMs)) {
+ log.warn("Thread " + streamThread.getName() +
" did not stop in the allotted time");
+ throw new TimeoutException("Thread " +
streamThread.getName() + " did not stop in the allotted time");
Review comment:
Hmmmm. That is interesting. I am not sure. If the thread hasn't been
removed then we don't want to resize the cache so would removing the thread
then throwing an exception the right way of doing it as the timeout is
essentially saying that removing the thread failed. So is it right to then
remove it anyways?
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