io.cdap.cdap.internal.app.runtime.distributed.WorkerTwillProgramController Maven / Gradle / Ivy
/*
* Copyright © 2015-2016 Cask Data, Inc.
*
* Licensed 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 io.cdap.cdap.internal.app.runtime.distributed;
import io.cdap.cdap.internal.app.runtime.ProgramOptionConstants;
import io.cdap.cdap.proto.id.ProgramRunId;
import org.apache.twill.api.TwillController;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Map;
/**
* A ProgramController for Workers that are launched through Twill.
*/
public class WorkerTwillProgramController extends AbstractTwillProgramController {
private static final Logger LOG = LoggerFactory.getLogger(WorkerTwillProgramController.class);
WorkerTwillProgramController(ProgramRunId programRunId, TwillController controller) {
super(programRunId, controller);
}
@SuppressWarnings("unchecked")
@Override
protected void doCommand(String name, Object value) throws Exception {
if (!ProgramOptionConstants.INSTANCES.equals(name) || !(value instanceof Map)) {
return;
}
Map command = (Map) value;
try {
changeInstances(command.get("runnable"),
Integer.parseInt(command.get("newInstances")),
Integer.parseInt(command.get("oldInstances")));
} catch (Throwable t) {
LOG.error(String.format("Failed to change instances: %s", command), t);
throw t;
}
}
private synchronized void changeInstances(String runnableId,
int newInstanceCount, int oldInstanceCount) throws Exception {
LOG.info("Changing instances of {} from {} to {}", getProgramRunId(), oldInstanceCount, newInstanceCount);
getTwillController().changeInstances(runnableId, newInstanceCount).get();
LOG.info("Completed changing instances of {} from {} to {}", getProgramRunId(), oldInstanceCount, newInstanceCount);
}
}