rkhachatryan commented on code in PR #19679:
URL: https://github.com/apache/flink/pull/19679#discussion_r902024128
##########
flink-state-backends/flink-statebackend-changelog/src/main/java/org/apache/flink/state/changelog/restore/ChangelogRestoreTarget.java:
##########
@@ -21,52 +21,143 @@
import org.apache.flink.api.common.state.State;
import org.apache.flink.api.common.state.StateDescriptor;
import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.runtime.state.AbstractKeyedStateBackend;
import org.apache.flink.runtime.state.CheckpointableKeyedStateBackend;
import org.apache.flink.runtime.state.KeyGroupRange;
import org.apache.flink.runtime.state.KeyGroupedInternalPriorityQueue;
import org.apache.flink.runtime.state.Keyed;
-import org.apache.flink.runtime.state.KeyedStateBackend;
import org.apache.flink.runtime.state.PriorityComparable;
-import org.apache.flink.runtime.state.PriorityQueueSetFactory;
import org.apache.flink.runtime.state.heap.HeapPriorityQueueElement;
+import org.apache.flink.runtime.state.internal.InternalKvState;
+import org.apache.flink.runtime.state.metainfo.StateMetaInfoSnapshot;
import
org.apache.flink.runtime.state.metainfo.StateMetaInfoSnapshot.BackendStateType;
+import org.apache.flink.state.changelog.ChangelogKeyGroupedPriorityQueue;
import org.apache.flink.state.changelog.ChangelogState;
+import org.apache.flink.state.changelog.ChangelogStateFactory;
+import org.apache.flink.state.changelog.KvStateChangeLogger;
+import org.apache.flink.state.changelog.StateChangeLogger;
import javax.annotation.Nonnull;
/** Maintains metadata operation related to Changelog recovery. */
@Internal
-public interface ChangelogRestoreTarget<K> {
+public abstract class ChangelogRestoreTarget<K> {
+
+ protected final AbstractKeyedStateBackend<K> keyedStateBackend;
+
+ protected final ChangelogStateFactory changelogStateFactory;
+
+ protected final FunctionDelegationHelper functionDelegationHelper;
+
+ public ChangelogRestoreTarget(
+ AbstractKeyedStateBackend<K> keyedStateBackend,
+ ChangelogStateFactory changelogStateFactory) {
+ this.keyedStateBackend = keyedStateBackend;
+ this.changelogStateFactory = changelogStateFactory;
+ this.functionDelegationHelper = new FunctionDelegationHelper();
+ }
/** Returns the key groups which this restore procedure covers. */
- KeyGroupRange getKeyGroupRange();
+ public KeyGroupRange getKeyGroupRange() {
+ return keyedStateBackend.getKeyGroupRange();
+ }
+
+ /**
+ * Returns the existing state created by {@link
#createKeyedState(TypeSerializer,
+ * StateDescriptor)} or {@link #createPqState(String, TypeSerializer)} in
the restore procedure.
+ */
+ public ChangelogState getExistingState(
+ String name, StateMetaInfoSnapshot.BackendStateType type) {
+ return changelogStateFactory.getExistingState(name, type);
+ }
/**
* Creates a keyed state which could be retrieved by {@link
#getExistingState(String,
- * BackendStateType)} in the restore procedure. The interface comes from
{@link
- * KeyedStateBackend#getOrCreateKeyedState(TypeSerializer,
StateDescriptor)}.
+ * BackendStateType)} in the restore procedure.
*/
- <N, S extends State, V> S createKeyedState(
+ @SuppressWarnings("unchecked")
+ public <N, S extends State, V> S createKeyedState(
TypeSerializer<N> namespaceSerializer, StateDescriptor<S, V>
stateDescriptor)
- throws Exception;
+ throws Exception {
+ ChangelogState existingState =
+ changelogStateFactory.getExistingState(
+ stateDescriptor.getName(),
+ StateMetaInfoSnapshot.BackendStateType.KEY_VALUE);
+ if (existingState == null
+ || !isCompleteCompatible(
+ (InternalKvState<K, N, V>) existingState,
+ namespaceSerializer,
+ stateDescriptor)) {
+ S keyedState =
+ keyedStateBackend.upgradeKeyedState(namespaceSerializer,
stateDescriptor);
+ functionDelegationHelper.addOrUpdate(stateDescriptor);
+ final InternalKvState<K, N, V> kvState = (InternalKvState<K, N,
V>) keyedState;
+ return (S)
+ changelogStateFactory.create(
+ stateDescriptor,
+ kvState,
+ getKvStateChangeLogger(kvState, stateDescriptor),
+ keyedStateBackend);
+ }
+ return (S) existingState;
+ }
+
+ private <N, S extends State, V> boolean isCompleteCompatible(
+ InternalKvState<K, N, V> existingState,
+ TypeSerializer<N> namespaceSerializer,
+ StateDescriptor<S, V> stateDescriptor) {
+ return isCompleteCompatible(existingState.getNamespaceSerializer(),
namespaceSerializer)
+ && isCompleteCompatible(
+ existingState.getValueSerializer(),
stateDescriptor.getSerializer());
+ }
+
+ private <T> boolean isCompleteCompatible(
+ TypeSerializer<T> originalSerializer, TypeSerializer<T>
newSerializer) {
+ return originalSerializer.equals(newSerializer);
Review Comment:
Is the contract of Serializers `equals` suitable for migration?
Shouldn't it be something like
`originalSerializer.snapshotConfiguration().resolveSchemaCompatibility(newSerializer).isIncompatible()`
?
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