diff --git a/queue/src/main/java/org/killbill/queue/retry/RetryableService.java b/queue/src/main/java/org/killbill/queue/retry/RetryableService.java
index 501ca322..0c97da7b 100644
--- a/queue/src/main/java/org/killbill/queue/retry/RetryableService.java
+++ b/queue/src/main/java/org/killbill/queue/retry/RetryableService.java
@@ -138,6 +138,7 @@ public void scheduleRetry(final QueueRetryException exception,
         final DateTime effectiveDate = computeRetryDate(exception, originalEffectiveDate, retryNb);
         if (effectiveDate == null) {
             log.warn("Error processing event, NOT scheduling retry for event='{}', retryNb='{}'", originalNotificationEvent, retryNb, exception);
+            onRetriesExhausted(originalNotificationEvent, searchKey1, searchKey2);
             throw new RetryableInternalException(false);
         }
         log.warn("Error processing event, scheduling retry for event='{}', effectiveDate='{}', retryNb='{}'", originalNotificationEvent, effectiveDate, retryNb, exception);
@@ -148,10 +149,20 @@ public void scheduleRetry(final QueueRetryException exception,
             throw new RetryableInternalException(true);
         } catch (final IOException e) {
             log.error("Unable to schedule retry for event='{}', effectiveDate='{}'", originalNotificationEvent, effectiveDate, e);
+            onRetriesExhausted(originalNotificationEvent, searchKey1, searchKey2);
             throw new RetryableInternalException(false);
         }
     }
 
+    /**
+     * Called when the retry schedule is exhausted for an event, or when a retry cannot be scheduled
+     * due to a serialization error. Subclasses can override to take remedial action (e.g. parking
+     * the account). searchKey1 = accountRecordId, searchKey2 = tenantRecordId.
+     */
+    protected void onRetriesExhausted(final QueueEvent event, final Long searchKey1, final Long searchKey2) {
+        // no-op by default
+    }
+
     private DateTime computeRetryDate(final QueueRetryException queueRetryException, final DateTime initialEventDateTime, final int retryNb) {
         final List<Period> retrySchedule = queueRetryException.getRetrySchedule();
         if (retrySchedule == null || retryNb > retrySchedule.size()) {
diff --git a/queue/src/test/java/org/killbill/queue/TestReaperIntegration.java b/queue/src/test/java/org/killbill/queue/TestReaperIntegration.java
index 879bfa7b..cff647a1 100644
--- a/queue/src/test/java/org/killbill/queue/TestReaperIntegration.java
+++ b/queue/src/test/java/org/killbill/queue/TestReaperIntegration.java
@@ -339,7 +339,7 @@ public void processEvent(final BusEvent event) {
         }
 
         void waitFor(final BusEvent event) {
-            Awaitility.await().atMost(15, TimeUnit.SECONDS).until(new Callable<Boolean>() {
+            Awaitility.await().atMost(30, TimeUnit.SECONDS).until(new Callable<Boolean>() {
                 @Override
                 public Boolean call() throws Exception {
                     return receivedEvents.contains(event.getUserToken());