bugfix: revert update of in memory lease if DDB lease renewal throws error

amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/dynamodb/DynamoDBLeaseRenewer.java

@@ -322,6 +322,7 @@ public class DynamoDBLeaseRenewer implements LeaseRenewer {
 
         long startTime = System.currentTimeMillis();
         boolean success = false;
+        Lease authoritativeLeaseCopy = authoritativeLease.copy();
         try {
             log.info("Updating lease from {} to {}", authoritativeLease, lease);
             synchronized (authoritativeLease) {
@@ -358,6 +359,10 @@ public class DynamoDBLeaseRenewer implements LeaseRenewer {
                 success = true;
                 return updatedLease;
             }
+        } catch (ProvisionedThroughputException | InvalidStateException | DependencyException e) {
+            // On failure in updating DDB, revert changes to in memory lease
+            authoritativeLease.update(authoritativeLeaseCopy);
+            throw e;
         } finally {
             MetricsUtil.addSuccessAndLatency(scope, "UpdateLease", success, startTime, MetricsLevel.DETAILED);
             MetricsUtil.endScope(scope);

amazon-kinesis-client/src/test/java/software/amazon/kinesis/leases/dynamodb/DynamoDBLeaseRenewerTest.java

@@ -34,13 +34,16 @@ import software.amazon.kinesis.leases.exceptions.DependencyException;
 import software.amazon.kinesis.leases.exceptions.InvalidStateException;
 import software.amazon.kinesis.leases.exceptions.ProvisionedThroughputException;
 import software.amazon.kinesis.metrics.NullMetricsFactory;
+import software.amazon.kinesis.retrieval.kpl.ExtendedSequenceNumber;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
 import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 
@@ -63,7 +66,7 @@ public class DynamoDBLeaseRenewerTest {
                 System.nanoTime(),
                 null,
                 null,
-                null,
+                1L,
                 new HashSet<>(),
                 new HashSet<>(),
                 null,
@@ -134,4 +137,35 @@ public class DynamoDBLeaseRenewerTest {
         // Clear the list to avoid triggering expectation mismatch in after().
         leasesToRenew.clear();
     }
+
+    @Test
+    public void testLeaseRenewerDoesNotUpdateInMemoryLeaseIfDDBFailsUpdate()
+            throws DependencyException, InvalidStateException, ProvisionedThroughputException {
+        String leaseKey = "leaseToUpdate";
+        Lease lease = newLease(leaseKey);
+        lease.checkpoint(ExtendedSequenceNumber.LATEST);
+        leasesToRenew = new ArrayList<>();
+        leasesToRenew.add(lease);
+        renewer.addLeasesToRenew(leasesToRenew);
+
+        doReturn(true).when(leaseRefresher).renewLease(lease);
+        renewer.renewLeases();
+
+        Lease updatedLease = newLease(leaseKey);
+        updatedLease.checkpoint(ExtendedSequenceNumber.TRIM_HORIZON);
+
+        doThrow(new DependencyException(new RuntimeException()))
+                .when(leaseRefresher)
+                .updateLease(updatedLease);
+
+        try {
+            UUID concurrencyToken = renewer.getCurrentlyHeldLease(leaseKey).concurrencyToken();
+            renewer.updateLease(updatedLease, concurrencyToken, "test", "dummyShardId");
+            fail();
+        } catch (DependencyException e) {
+            // expected
+        }
+        assertEquals(0L, (long) lease.leaseCounter()); // leaseCounter should not be incremented due to DDB failure
+        assertEquals(ExtendedSequenceNumber.LATEST, lease.checkpoint());
+    }
 }