singhpk234 commented on code in PR #14824:
URL: https://github.com/apache/iceberg/pull/14824#discussion_r2617420624


##########
core/src/main/java/org/apache/iceberg/rest/ScanTaskIterable.java:
##########
@@ -137,16 +131,47 @@ public void run() {
 
       } catch (InterruptedException e) {
         Thread.currentThread().interrupt();
+        failure.compareAndSet(null, new RuntimeException("PlanWorker was 
interrupted", e));
+        shutdown.set(true);
       } catch (Exception e) {
-        throw new RuntimeException("Worker failed processing planTask", e);
+        failure.compareAndSet(null, new RuntimeException("Worker failed 
processing planTask", e));
+        shutdown.set(true);
       } finally {
-        int remaining = activeWorkers.decrementAndGet();
+        handleWorkerExit();
+      }
+    }
+
+    private void handleWorkerExit() {
+      boolean isLastWorker = activeWorkers.decrementAndGet() == 0;
+      boolean hasWorkLeft = !planTasks.isEmpty() || 
!initialFileScanTasks.isEmpty();
+      boolean isShuttingDown = shutdown.get();
+
+      if (isLastWorker && (!hasWorkLeft || isShuttingDown)) {
+        signalCompletion();
+      } else if (isLastWorker && hasWorkLeft) {
+        failure.compareAndSet(
+            null,
+            new IllegalStateException("Workers have exited but there is still 
work to be done"));
+        shutdown.set(true);
+      }
+    }
+
+    private void signalCompletion() {
+      try {
+        taskQueue.put(DUMMY_TASK);

Review Comment:
   Thats a nice call out i added a utility to use offer and test for seeing if 
the workers are done producing incase the consumer blows up due to other 
thread, in close() we clear the taskQueue
    



##########
core/src/main/java/org/apache/iceberg/rest/ScanTaskIterable.java:
##########
@@ -137,16 +131,47 @@ public void run() {
 
       } catch (InterruptedException e) {
         Thread.currentThread().interrupt();
+        failure.compareAndSet(null, new RuntimeException("PlanWorker was 
interrupted", e));
+        shutdown.set(true);
       } catch (Exception e) {
-        throw new RuntimeException("Worker failed processing planTask", e);
+        failure.compareAndSet(null, new RuntimeException("Worker failed 
processing planTask", e));
+        shutdown.set(true);
       } finally {
-        int remaining = activeWorkers.decrementAndGet();
+        handleWorkerExit();
+      }
+    }
+
+    private void handleWorkerExit() {
+      boolean isLastWorker = activeWorkers.decrementAndGet() == 0;
+      boolean hasWorkLeft = !planTasks.isEmpty() || 
!initialFileScanTasks.isEmpty();
+      boolean isShuttingDown = shutdown.get();
+
+      if (isLastWorker && (!hasWorkLeft || isShuttingDown)) {
+        signalCompletion();
+      } else if (isLastWorker && hasWorkLeft) {
+        failure.compareAndSet(
+            null,
+            new IllegalStateException("Workers have exited but there is still 
work to be done"));
+        shutdown.set(true);
+      }
+    }
+
+    private void signalCompletion() {
+      try {
+        taskQueue.put(DUMMY_TASK);

Review Comment:
   Thats a nice call out i added a utility to use offer and test for seeing if 
the workers are done producing incase the consumer blows up due to other thread



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