org.apache.flink.streaming.runtime.io.checkpointing.UpstreamRecoveryTracker 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,
* 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.io.checkpointing;
import org.apache.flink.annotation.Internal;
import org.apache.flink.annotation.VisibleForTesting;
import org.apache.flink.runtime.checkpoint.channel.InputChannelInfo;
import org.apache.flink.runtime.io.network.partition.consumer.InputGate;
import org.apache.flink.util.Preconditions;
import java.io.IOException;
import java.util.HashSet;
/** Tracks status of upstream channels while they recover. */
@Internal
@VisibleForTesting
public interface UpstreamRecoveryTracker {
void handleEndOfRecovery(InputChannelInfo channelInfo) throws IOException;
boolean allChannelsRecovered();
static UpstreamRecoveryTracker forInputGate(InputGate inputGate) {
return new UpstreamRecoveryTrackerImpl(inputGate);
}
UpstreamRecoveryTracker NO_OP =
new UpstreamRecoveryTracker() {
@Override
public void handleEndOfRecovery(InputChannelInfo channelInfo) {}
@Override
public boolean allChannelsRecovered() {
return true;
}
};
}
final class UpstreamRecoveryTrackerImpl implements UpstreamRecoveryTracker {
private final HashSet restoredChannels;
private int numUnrestoredChannels;
private final InputGate inputGate;
UpstreamRecoveryTrackerImpl(InputGate inputGate) {
this.restoredChannels = new HashSet<>();
this.numUnrestoredChannels = inputGate.getNumberOfInputChannels();
this.inputGate = inputGate;
}
@Override
public void handleEndOfRecovery(InputChannelInfo channelInfo) throws IOException {
if (numUnrestoredChannels > 0) {
Preconditions.checkState(
!restoredChannels.contains(channelInfo), "already restored: %s", channelInfo);
restoredChannels.add(channelInfo);
numUnrestoredChannels--;
if (numUnrestoredChannels == 0) {
for (InputChannelInfo inputChannelInfo : inputGate.getChannelInfos()) {
inputGate.resumeConsumption(inputChannelInfo);
}
restoredChannels.clear();
}
}
}
@Override
public boolean allChannelsRecovered() {
return numUnrestoredChannels == 0;
}
}