wcarlson5 commented on a change in pull request #9984:
URL: https://github.com/apache/kafka/pull/9984#discussion_r565784940



##########
File path: streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java
##########
@@ -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. The timeout is essentially 
saying that removing the thread failed. So is it right to then remove it 
anyways? 




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