tillrohrmann commented on a change in pull request #7320: [FLINK-11171] Avoid
concurrent usage of StateSnapshotTransformer
URL: https://github.com/apache/flink/pull/7320#discussion_r247968937
##########
File path:
flink-runtime/src/test/java/org/apache/flink/runtime/state/StateBackendTestBase.java
##########
@@ -3902,6 +3906,84 @@ public void testParallelAsyncSnapshots() throws
Exception {
}
}
+ @Test
+ public void testNonConcurrentSnapshotTransformerAccess() throws
Exception {
+ Random rnd = new Random();
+ BlockerCheckpointStreamFactory streamFactory = new
BlockerCheckpointStreamFactory(1024 * 1024);
+ AbstractKeyedStateBackend<Integer> backend = null;
+ try {
+ backend = createKeyedBackend(IntSerializer.INSTANCE);
+ InternalValueState<Integer, VoidNamespace, String>
valueState = backend.createInternalState(
+ VoidNamespaceSerializer.INSTANCE,
+ new ValueStateDescriptor<>("test",
StringSerializer.INSTANCE),
+
createSingleThreadAccessCheckingStateSnapshotTransformFactory());
+
+ valueState.setCurrentNamespace(VoidNamespace.INSTANCE);
+
+ for (int i = 0; i < 100; i++) {
+ backend.setCurrentKey(i);
+
valueState.update(StringUtils.getRandomString(rnd,5, 10));
+ }
+
+ CheckpointOptions checkpointOptions =
CheckpointOptions.forCheckpointWithDefaultLocation();
+
+ RunnableFuture<SnapshotResult<KeyedStateHandle>>
snapshot1 =
+ backend.snapshot(1L, 0L, streamFactory,
checkpointOptions);
+
+ RunnableFuture<SnapshotResult<KeyedStateHandle>>
snapshot2 =
+ backend.snapshot(2L, 0L, streamFactory,
checkpointOptions);
+
+ Thread runner1 = new Thread(snapshot1, "snapshot1");
+ runner1.start();
+ Thread runner2 = new Thread(snapshot2, "snapshot2");
+ runner2.start();
+
+ runner1.join();
+ runner2.join();
+
+ snapshot1.get();
+ snapshot2.get();
+ } finally {
+ if (backend != null) {
+ IOUtils.closeQuietly(backend);
+ backend.dispose();
+ }
+ }
+ }
+
+ private static <T> StateSnapshotTransformFactory<T>
+ createSingleThreadAccessCheckingStateSnapshotTransformFactory() {
+ return new StateSnapshotTransformFactory<T>() {
+ @Override
+ public Optional<StateSnapshotTransformer<T>>
createForDeserializedState() {
+ return createStateSnapshotTransformer();
+ }
+
+ @Override
+ public Optional<StateSnapshotTransformer<byte[]>>
createForSerializedState() {
+ return createStateSnapshotTransformer();
+ }
+
+ private <T1> Optional<StateSnapshotTransformer<T1>>
createStateSnapshotTransformer() {
+ return Optional.of(new
StateSnapshotTransformer<T1>() {
+ private Thread currentThread = null;
+
+ @Nullable
+ @Override
+ public T1 filterOrTransform(@Nullable
T1 value) {
+ if (currentThread == null) {
+ currentThread =
Thread.currentThread();
+ } else {
+
assertEquals("Concurrent access from another thread",
+ currentThread,
Thread.currentThread());
+ }
Review comment:
The current implementation assumes that there is only a single element to
transform, right? Otherwise it should fail with the second element.
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