KAFKA-10562: Properly invoke new StateStoreContext init #9388

vvcephei · 2020-10-07T03:23:35Z

all wrapping stores should pass StateStoreContext init through to the same
method on the wrapped store and not translate it to ProcessorContext init
base-level stores should handle StateStoreContext init so that callers passing
a non-InternalProcessorContext implementation will be able to initialize the store
extra tests are added to verify the desired behavior

Committer Checklist (excluded from commit message)

Verify design and implementation
Verify test coverage and CI build status
Verify documentation (including upgrade notes)

vvcephei · 2020-10-07T03:24:19Z

...amples/src/test/java/org/apache/kafka/streams/examples/wordcount/WordCountProcessorTest.java

@@ -34,6 +34,7 @@
 * Demonstrate the use of {@link MockProcessorContext} for testing the {@link Processor} in the {@link WordCountProcessorDemo}.
 */
 public class WordCountProcessorTest {
+    @SuppressWarnings("deprecation") // TODO will be fixed in KAFKA-10437


This ticket needs to go in to 2.7.0 also, but I split it out for reviewability.

vvcephei · 2020-10-07T03:24:57Z

streams/src/main/java/org/apache/kafka/streams/processor/StateStore.java

     */
+    @Deprecated


Adding the deprecation tag right now lets us be sure we encountered all places this method appears in the codebase.

vvcephei · 2020-10-07T03:27:01Z

...ms/src/main/java/org/apache/kafka/streams/processor/internals/AbstractReadOnlyDecorator.java

+    @Override
+    public void init(final StateStoreContext context,
+                     final StateStore root) {
+        throw new UnsupportedOperationException(ERROR_MESSAGE);


There are going to be a lot of duplicated init methods. It's not great, but hopefully we can drop the old API before too long.

vvcephei · 2020-10-07T03:27:45Z

streams/src/main/java/org/apache/kafka/streams/processor/internals/ProcessorContextUtils.java

+    public static StreamsMetricsImpl getMetricsImpl(final StateStoreContext context) {
+        return (StreamsMetricsImpl) context.metrics();
+    }


Added a bunch of duplicated extractors here to help keep the implementation classes clean.

vvcephei · 2020-10-07T03:28:28Z

streams/src/main/java/org/apache/kafka/streams/processor/internals/ProcessorContextUtils.java

+    public static InternalProcessorContext asInternalProcessorContext(final ProcessorContext context) {
+        if (context instanceof InternalProcessorContext) {
+            return (InternalProcessorContext) context;
+        } else {
+            throw new IllegalArgumentException(
+                "This component requires internal features of Kafka Streams and must be disabled for unit tests."
+            );
+        }
+    }


I replaced a lot of casts with this checked-cast method, which also lets us get rid of a lot of similar cast-checking blocks, which were inconsistently applied.

vvcephei · 2020-10-07T03:38:37Z

streams/src/main/java/org/apache/kafka/streams/state/internals/KeyValueSegment.java

+    public void openDB(final Map<String, Object> configs, final File stateDir) {
+        super.openDB(configs, stateDir);


I was able to remove the type-dependency of the context by re-specifying the interface in terms of the only two properties it needed.

vvcephei · 2020-10-07T03:40:11Z

streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredKeyValueStore.java

        taskId = context.taskId().toString();
        initStoreSerde(context);
        streamsMetrics = (StreamsMetricsImpl) context.metrics();

+        registerMetrics();


I wasn't able to extract out quite as much common code in the Metered implementations because they need to work regardless of whether the context is an InternalProcessorContext or whether it's a straight mock (for unit tests).

this.context seems only used in the e2e latency as

final long e2eLatency = currentTime - context.timestamp();

And in that case we may throw a NPE. Should we augment the condition as

if (e2eLatencySensor.shouldRecord() && context != null)

NVM, I saw you already did this :)

vvcephei · 2020-10-07T03:40:44Z

streams/src/main/java/org/apache/kafka/streams/state/internals/RocksDBStore.java

@@ -122,7 +122,7 @@
    }

    @SuppressWarnings("unchecked")
-    void openDB(final ProcessorContext context) {
+    void openDB(final Map<String, Object> configs, final File stateDir) {


Here's the interface change that saved us from needing two openDB methods.

vvcephei · 2020-10-07T03:42:32Z

...c/test/java/org/apache/kafka/streams/processor/internals/GlobalProcessorContextImplTest.java

@@ -147,7 +147,7 @@ public void shouldNotAllowToSchedulePunctuations() {
    public void shouldNotAllowInitForKeyValueStore() {
        final StateStore store = globalContext.getStateStore(GLOBAL_KEY_VALUE_STORE_NAME);
        try {
-            store.init((ProcessorContext) null, null);
+            store.init((StateStoreContext) null, null);


This was actually a bug before, which this PR fixes: the wrapping layers should transmit the init call straight down, rather than translating it. There are a whole set of new unit tests making sure that this works properly for both the new and old init methods.

vvcephei · 2020-10-07T03:46:52Z

streams/src/test/java/org/apache/kafka/streams/state/internals/CachingKeyValueStoreTest.java

@@ -100,6 +100,31 @@ public void after() {
        return store;
    }

+    @SuppressWarnings("deprecation")
+    @Test
+    public void shouldDelegateDeprecatedInit() {


These are the new unit tests I added to make sure that all the store builder wrappers transmit init calls correctly. They are frustratingly similar, but not exactly the same across different test classes because the test classes follow different idioms.

I think it'd be nice to follow up with a general store-verification test that's parameterized by the exact store types so we can specify this test logic once and apply it to all the stores. That would also be handy for most of the rest of these tests. But I don't think we need to distract this PR with that concern.

guozhangwang · 2020-10-07T18:30:53Z

streams/src/main/java/org/apache/kafka/streams/processor/internals/ProcessorContextUtils.java

+    public static InternalProcessorContext asInternalProcessorContext(final ProcessorContext context) {
+        if (context instanceof InternalProcessorContext) {
+            return (InternalProcessorContext) context;
+        } else {
+            throw new IllegalArgumentException(
+                "This component requires internal features of Kafka Streams and must be disabled for unit tests."
+            );
+        }
+    }


guozhangwang · 2020-10-07T21:32:50Z

...rc/main/java/org/apache/kafka/streams/state/internals/InMemoryTimeOrderedKeyValueBuffer.java

 import org.apache.kafka.streams.processor.internals.InternalProcessorContext;
+import org.apache.kafka.streams.processor.internals.ProcessorContextUtils;


Why not import static the function directly like in other classes?

Oh, probably just overlooked it.

guozhangwang · 2020-10-07T22:25:17Z

streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredKeyValueStore.java

        taskId = context.taskId().toString();
        initStoreSerde(context);
        streamsMetrics = (StreamsMetricsImpl) context.metrics();

+        registerMetrics();


this.context seems only used in the e2e latency as

final long e2eLatency = currentTime - context.timestamp();

And in that case we may throw a NPE. Should we augment the condition as

if (e2eLatencySensor.shouldRecord() && context != null)

guozhangwang · 2020-10-07T22:32:16Z

streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredKeyValueStore.java

+        streamsMetrics = (StreamsMetricsImpl) context.metrics();
+
+        registerMetrics();
+        final Sensor restoreSensor =


Actually I think we should remove the restoreSensor since we no longer restore the state upon init any more? In KIP-444 we no longer have it as a state-store level metric.

huh. I'll double-check and take it out.

Actually, I'll do that in a quick follow-up PR, so I can go ahead and merge this.

guozhangwang · 2020-10-07T22:35:53Z

streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredKeyValueStore.java

        taskId = context.taskId().toString();
        initStoreSerde(context);
        streamsMetrics = (StreamsMetricsImpl) context.metrics();

+        registerMetrics();


NVM, I saw you already did this :)

guozhangwang · 2020-10-07T22:36:07Z

streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredSessionStore.java

+        streamsMetrics = (StreamsMetricsImpl) context.metrics();
+
+        registerMetrics();
+        final Sensor restoreSensor =


Ditto here.

guozhangwang · 2020-10-07T22:37:58Z

streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredWindowStore.java

@@ -122,7 +158,7 @@ public boolean setFlushListener(final CacheFlushListener<Windowed<K>, V> listene
    @Override
    public void put(final K key,
                    final V value) {
-        put(key, value, context.timestamp());
+        put(key, value, context != null ? context.timestamp() : 0L);


Thinking about this a bit more: is this.context only null in unit tests? It seems a bit overkill to let non-testing code to cope with testing code if yes..

Could we let the mock class to extend from InternalProcessorContext as well?

Yeah, it's not something I normally like to do, either. In this case, though, it's necessary. The thing is that all our internal StateStoreContexts are InternalProcessorContext implementations, and therefore, they are also ProcessorContext implementations, so they have a timestamp() method.

The thing that makes this unavoidable is that it's ok for users to init a state store using the MockProcessorContext we provide for them in test-utils. This is a bit of a bleed-over from the next pr, which I'm still finishing up, but it's better if we keep their context "pure". I.e., I'm going to propose to add a new context that's just an api.ProcessorContext and a separate implementation that just a StateStoreContext. We should discuss on that PR whether that's really the best way to present it, but if you ultimately agree, then it means we have to expect a null context here.

Note that the only functionality it affects is the recording of metrics that probably don't matter in unit tests and this stub behavior for a deprecated method that people shouldn't be using.

If after reviewing the next PR, we do wind up converging the implementations, I'll come back and undo these checks here.

vvcephei · 2020-10-08T04:05:06Z

Looks like the java 11 build only had a couple of environmental failures:

00:52:22  org.gradle.internal.remote.internal.ConnectException: Could not connect to server [86e7da13-a292-40f6-a626-7774e2173e77 port:42903, addresses:[/127.0.0.1]]. Tried addresses: [/127.0.0.1].
00:52:22  	at org.gradle.internal.remote.internal.inet.TcpOutgoingConnector.connect(TcpOutgoingConnector.java:67)
00:52:22  	at org.gradle.internal.remote.internal.hub.MessageHubBackedClient.getConnection(MessageHubBackedClient.java:36)
00:52:22  	at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:123)
00:52:22  	at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:71)
00:52:22  	at worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
00:52:22  	at worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)
00:52:22  Caused by: java.net.ConnectException: Connection refused
00:52:22  	at java.base/sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
00:52:22  	at java.base/sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:776)
00:52:22  	at java.base/sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:120)
00:52:22  	at org.gradle.internal.remote.internal.inet.TcpOutgoingConnector.tryConnect(TcpOutgoingConnector.java:81)
00:52:22  	at org.gradle.internal.remote.internal.inet.TcpOutgoingConnector.connect(TcpOutgoingConnector.java:54)
00:52:22  	... 5 more

vvcephei · 2020-10-08T04:05:48Z

Thanks for the review, @guozhangwang ! I'll go ahead and merge this, and deal with the couple of cleanup issues in a follow-on PR.

* all wrapping stores should pass StateStoreContext init through to the same method on the wrapped store and not translate it to ProcessorContext init * base-level stores should handle StateStoreContext init so that callers passing a non-InternalProcessorContext implementation will be able to initialize the store * extra tests are added to verify the desired behavior Reviewers: Guozhang Wang <[email protected]>

* commit '2804257fe221f37e5098bd': (67 commits) KAFKA-10562: Properly invoke new StateStoreContext init (apache#9388) MINOR: trivial cleanups, javadoc errors, omitted StateStore tests, etc. (apache#8130) KAFKA-10564: only process non-empty task directories when internally cleaning obsolete state stores (apache#9373) KAFKA-9274: fix incorrect default value for `task.timeout.ms` config (apache#9385) KAFKA-10362: When resuming Streams active task with EOS, the checkpoint file is deleted (apache#9247) KAFKA-10028: Implement write path for feature versioning system (KIP-584) (apache#9001) KAFKA-10402: Upgrade system tests to python3 (apache#9196) KAFKA-10186; Abort transaction with pending data with TransactionAbortedException (apache#9280) MINOR: Remove `TargetVoters` from `DescribeQuorum` (apache#9376) Revert "KAFKA-10469: Resolve logger levels hierarchically (apache#9266)" MINOR: Don't publish javadocs for raft module (apache#9336) KAFKA-9929: fix: add missing default implementations (apache#9321) KAFKA-10188: Prevent SinkTask::preCommit from being called after SinkTask::stop (apache#8910) KAFKA-10338; Support PEM format for SSL key and trust stores (KIP-651) (apache#9345) KAFKA-10527; Voters should not reinitialize as leader in same epoch (apache#9348) MINOR: Refactor unit tests around RocksDBConfigSetter (apache#9358) KAFKA-6733: Printing additional ConsumerRecord fields in DefaultMessageFormatter (apache#9099) MINOR: Annotate test BlockingConnectorTest as integration test (apache#9379) MINOR: Fix failing test due to KAFKA-10556 PR (apache#9372) KAFKA-10439: Connect's Values to parse BigInteger as Decimal with zero scale. (apache#9320) ...

John Roesler added 5 commits October 5, 2020 15:47

KAFKA-10562: Delegate store wrappers to new init method

59e3e34

wip

e53cdf4

asdf

af662e1

wip

f4448fd

done

4452d1b

vvcephei added the streams label Oct 7, 2020

John Roesler added 2 commits October 6, 2020 22:32

remove redundant check

430ca22

use shared init method

ab093bc

vvcephei commented Oct 7, 2020

View reviewed changes

guozhangwang reviewed Oct 7, 2020

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vvcephei merged commit 2804257 into trunk Oct 8, 2020

vvcephei deleted the kip-478-part-5-state-store-wrappers branch October 8, 2020 04:06

mjsax added the kip Requires or implements a KIP label Jan 8, 2021

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KAFKA-10562: Properly invoke new StateStoreContext init #9388

KAFKA-10562: Properly invoke new StateStoreContext init #9388

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vvcephei commented Oct 8, 2020

		public void openDB(final Map<String, Object> configs, final File stateDir) {
		super.openDB(configs, stateDir);

		import org.apache.kafka.streams.processor.internals.InternalProcessorContext;
		import org.apache.kafka.streams.processor.internals.ProcessorContextUtils;

KAFKA-10562: Properly invoke new StateStoreContext init #9388

KAFKA-10562: Properly invoke new StateStoreContext init #9388

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vvcephei commented Oct 7, 2020

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vvcephei commented Oct 8, 2020

vvcephei commented Oct 8, 2020