[
https://issues.apache.org/jira/browse/FLINK-7623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16212420#comment-16212420
]
ASF GitHub Bot commented on FLINK-7623:
---------------------------------------
Github user pnowojski commented on a diff in the pull request:
https://github.com/apache/flink/pull/4851#discussion_r145917932
--- Diff:
flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/tasks/RestoreStreamTaskTest.java
---
@@ -0,0 +1,325 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.runtime.tasks;
+
+import org.apache.flink.api.common.state.ListState;
+import org.apache.flink.api.common.state.ListStateDescriptor;
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeutils.base.LongSerializer;
+import org.apache.flink.api.common.typeutils.base.StringSerializer;
+import org.apache.flink.runtime.checkpoint.CheckpointMetaData;
+import org.apache.flink.runtime.checkpoint.CheckpointOptions;
+import org.apache.flink.runtime.checkpoint.OperatorSubtaskState;
+import org.apache.flink.runtime.checkpoint.StateAssignmentOperation;
+import org.apache.flink.runtime.checkpoint.TaskStateSnapshot;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.jobgraph.OperatorInstanceID;
+import org.apache.flink.runtime.operators.testutils.MockInputSplitProvider;
+import org.apache.flink.runtime.state.StateInitializationContext;
+import org.apache.flink.runtime.state.StateSnapshotContext;
+import org.apache.flink.streaming.api.operators.AbstractStreamOperator;
+import org.apache.flink.streaming.api.operators.OneInputStreamOperator;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.streaming.util.TestHarnessUtil;
+import org.apache.flink.util.TestLogger;
+
+import org.junit.Test;
+
+import java.util.Collections;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Tests ensuring correct behaviour of {@link
org.apache.flink.runtime.state.ManagedInitializationContext#isRestored}
+ * method.
+ */
+public class RestoreStreamTaskTest extends TestLogger {
+ @Test
+ public void testRestore() throws Exception {
+ AcknowledgeStreamMockEnvironment environment1 = processRecords(
+ new OperatorID(42L, 42L),
+ new CounterOperator(),
+ new OperatorID(44L, 44L),
+ new CounterOperator(),
+ Optional.empty());
+
+ assertEquals(2,
environment1.getCheckpointStateHandles().getSubtaskStateMappings().size());
+
+ TaskStateSnapshot stateHandles =
environment1.getCheckpointStateHandles();
+
+ try {
+ AcknowledgeStreamMockEnvironment environment2 =
processRecords(
+ new OperatorID(42L, 42L),
+ new RestoreCounterOperator(),
+ new OperatorID(44L, 44L),
+ new RestoreCounterOperator(),
+ Optional.of(stateHandles));
+
+ assertEquals(2,
RestoreCounterOperator.RESTORE_COUNTER.get());
+ }
+ finally {
+ RestoreCounterOperator.RESTORE_COUNTER.getAndSet(0);
+ }
+ }
+
+ @Test
+ public void testRestoreWithNewId() throws Exception {
+ AcknowledgeStreamMockEnvironment environment1 = processRecords(
+ new OperatorID(42L, 42L),
+ new CounterOperator(),
+ new OperatorID(44L, 44L),
+ new CounterOperator(),
+ Optional.empty());
+
+ assertEquals(2,
environment1.getCheckpointStateHandles().getSubtaskStateMappings().size());
+
+ TaskStateSnapshot stateHandles =
environment1.getCheckpointStateHandles();
+
+ try {
+ AcknowledgeStreamMockEnvironment environment2 =
processRecords(
+ new OperatorID(4242L, 4242L),
+ new RestoreCounterOperator(),
+ new OperatorID(44L, 44L),
+ new RestoreCounterOperator(),
+ Optional.of(stateHandles));
+
+ assertEquals(1,
RestoreCounterOperator.RESTORE_COUNTER.get());
+ }
+ finally {
+ RestoreCounterOperator.RESTORE_COUNTER.getAndSet(0);
+ }
+ }
+
+ @Test
+ public void testRestoreAfterScaleUp() throws Exception {
+ OperatorID headOperatorID = new OperatorID(42L, 42L);
+ OperatorID tailOperatorID = new OperatorID(44L, 44L);
+
+ AcknowledgeStreamMockEnvironment environment1 = processRecords(
+ headOperatorID,
+ new CounterOperator(),
+ tailOperatorID,
+ new CounterOperator(),
+ Optional.empty());
+
+ assertEquals(2,
environment1.getCheckpointStateHandles().getSubtaskStateMappings().size());
+
+ // test empty state in case of scale up
+ OperatorSubtaskState emptyHeadOperatorState =
StateAssignmentOperation.operatorSubtaskStateFrom(
+ new OperatorInstanceID(0, headOperatorID),
+ Collections.emptyMap(),
+ Collections.emptyMap(),
+ Collections.emptyMap(),
+ Collections.emptyMap());
+
+ TaskStateSnapshot stateHandles =
environment1.getCheckpointStateHandles();
+ stateHandles.putSubtaskStateByOperatorID(headOperatorID,
emptyHeadOperatorState);
+
+ try {
+ AcknowledgeStreamMockEnvironment environment2 =
processRecords(
+ headOperatorID,
+ new RestoreCounterOperator(),
+ tailOperatorID,
+ new RestoreCounterOperator(),
+ Optional.of(stateHandles));
+
+ assertEquals(2,
RestoreCounterOperator.RESTORE_COUNTER.get());
+ }
+ finally {
+ RestoreCounterOperator.RESTORE_COUNTER.getAndSet(0);
+ }
+ }
+
+ @Test
+ public void testRestoreWithoutState() throws Exception {
+ OperatorID headOperatorID = new OperatorID(42L, 42L);
+ OperatorID tailOperatorID = new OperatorID(44L, 44L);
+
+ AcknowledgeStreamMockEnvironment environment1 = processRecords(
+ headOperatorID,
+ new StatelessRestoreCounterOperator(),
+ tailOperatorID,
+ new CounterOperator(),
+ Optional.empty());
+
+ assertEquals(2,
environment1.getCheckpointStateHandles().getSubtaskStateMappings().size());
+
+ TaskStateSnapshot stateHandles =
environment1.getCheckpointStateHandles();
+
+ try {
+ AcknowledgeStreamMockEnvironment environment2 =
processRecords(
+ headOperatorID,
+ new StatelessRestoreCounterOperator(),
+ tailOperatorID,
+ new RestoreCounterOperator(),
+ Optional.of(stateHandles));
+
+ assertEquals(1,
StatelessRestoreCounterOperator.RESTORE_COUNTER.get());
--- End diff --
`StatelessRestoreCounterOperator` and `RestoreCounterOperator` are using
different counters. However that leads to my mistake, because this shows, that
even stateless operators are getting `isRestore() == true`.
> Detecting whether an operator is restored doesn't work with chained state
> -------------------------------------------------------------------------
>
> Key: FLINK-7623
> URL: https://issues.apache.org/jira/browse/FLINK-7623
> Project: Flink
> Issue Type: Bug
> Components: DataStream API, State Backends, Checkpointing
> Affects Versions: 1.4.0, 1.3.2
> Reporter: Aljoscha Krettek
> Assignee: Piotr Nowojski
> Priority: Blocker
> Fix For: 1.4.0, 1.3.3
>
> Attachments: StreamingJob.java
>
>
> Originally reported on the ML:
> https://lists.apache.org/thread.html/22a2cf83de3107aa81a03a921325a191c29df8aa8676798fcd497199@%3Cuser.flink.apache.org%3E
> If we have a chain of operators where multiple of them have operator state,
> detection of the {{context.isRestored()}} flag (of {{CheckpointedFunction}})
> does not work correctly. It's best exemplified using this minimal example
> where both the source and the flatMap have state:
> {code}
> final StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> env
> .addSource(new MaSource()).uid("source-1")
> .flatMap(new MaFlatMap()).uid("flatMap-1");
> env.execute("testing");
> {code}
> If I do a savepoint with these UIDs, then change "source-1" to "source-2" and
> restore from the savepoint {{context.isRestored()}} still reports {{true}}
> for the source.
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