org.apache.flink.runtime.state.DefaultOperatorStateBackendBuilder Maven / Gradle / Ivy
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* 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,
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*/
package org.apache.flink.runtime.state;
import org.apache.flink.annotation.VisibleForTesting;
import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.core.fs.CloseableRegistry;
import org.apache.flink.util.IOUtils;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
/**
* Builder class for {@link DefaultOperatorStateBackend} which handles all necessary initializations and clean ups.
*/
public class DefaultOperatorStateBackendBuilder implements
StateBackendBuilder {
/** The user code classloader. */
@VisibleForTesting
protected final ClassLoader userClassloader;
/** The execution configuration. */
@VisibleForTesting
protected final ExecutionConfig executionConfig;
/** Flag to de/activate asynchronous snapshots. */
@VisibleForTesting
protected final boolean asynchronousSnapshots;
/** State handles for restore. */
@VisibleForTesting
protected final Collection restoreStateHandles;
@VisibleForTesting
protected final CloseableRegistry cancelStreamRegistry;
public DefaultOperatorStateBackendBuilder(
ClassLoader userClassloader,
ExecutionConfig executionConfig,
boolean asynchronousSnapshots,
Collection stateHandles,
CloseableRegistry cancelStreamRegistry) {
this.userClassloader = userClassloader;
this.executionConfig = executionConfig;
this.asynchronousSnapshots = asynchronousSnapshots;
this.restoreStateHandles = stateHandles;
this.cancelStreamRegistry = cancelStreamRegistry;
}
@Override
public DefaultOperatorStateBackend build() throws BackendBuildingException {
Map> registeredOperatorStates = new HashMap<>();
Map> registeredBroadcastStates = new HashMap<>();
CloseableRegistry cancelStreamRegistryForBackend = new CloseableRegistry();
AbstractSnapshotStrategy snapshotStrategy =
new DefaultOperatorStateBackendSnapshotStrategy(
userClassloader,
asynchronousSnapshots,
registeredOperatorStates,
registeredBroadcastStates,
cancelStreamRegistryForBackend);
OperatorStateRestoreOperation restoreOperation = new OperatorStateRestoreOperation(
cancelStreamRegistry,
userClassloader,
registeredOperatorStates,
registeredBroadcastStates,
restoreStateHandles
);
try {
restoreOperation.restore();
} catch (Exception e) {
IOUtils.closeQuietly(cancelStreamRegistryForBackend);
throw new BackendBuildingException("Failed when trying to restore operator state backend", e);
}
return new DefaultOperatorStateBackend(
executionConfig,
cancelStreamRegistryForBackend,
registeredOperatorStates,
registeredBroadcastStates,
new HashMap<>(),
new HashMap<>(),
snapshotStrategy
);
}
}