LEEKYE commented on code in PR #35120:
URL: https://github.com/apache/beam/pull/35120#discussion_r2136171869


##########
sdks/java/harness/src/main/java/org/apache/beam/fn/harness/control/ExecutionStateSampler.java:
##########
@@ -357,6 +377,19 @@ private void takeSample(long currentTimeMillis, long 
millisSinceLastSample) {
         transitionsAtLastSample = transitionsAtThisSample;
       } else {
         long lullTimeMs = currentTimeMillis - lastTransitionTimeMillis.get();
+
+        try {
+          if (lullTimeMs > 
TimeUnit.MINUTES.toMillis(lullTimeMinuteForRestart)) {
+            throw new TimeoutException(
+                String.format(
+                    "The ptransform has been stuck for more than %d minutes, 
the SDK worker will"
+                        + " restart",
+                    lullTimeMinuteForRestart));
+          }
+        } catch (TimeoutException e) {
+          LOG.error(e.getMessage());

Review Comment:
   > I'm not sure I understand how it works. Here you handle exception (i.e. no 
TimeoutException is thrown outside of this function. But in test you do verify 
that exception is thrown...
   
   I probably have some misunderstanding about how throwing exception works...



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