io.druid.indexing.overlord.setup.EqualDistributionWorkerSelectStrategy Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
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*/
package io.druid.indexing.overlord.setup;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Sets;
import com.google.common.primitives.Ints;
import io.druid.indexing.common.task.Task;
import io.druid.indexing.overlord.ImmutableWorkerInfo;
import io.druid.indexing.overlord.config.WorkerTaskRunnerConfig;
import java.util.Comparator;
import java.util.TreeSet;
/**
*/
public class EqualDistributionWorkerSelectStrategy implements WorkerSelectStrategy
{
@Override
public Optional findWorkerForTask(
WorkerTaskRunnerConfig config, ImmutableMap zkWorkers, Task task
)
{
final TreeSet sortedWorkers = Sets.newTreeSet(
new Comparator()
{
@Override
public int compare(
ImmutableWorkerInfo zkWorker, ImmutableWorkerInfo zkWorker2
)
{
int retVal = -Ints.compare(zkWorker2.getCurrCapacityUsed(), zkWorker.getCurrCapacityUsed());
// the version sorting is needed because if the workers have the same currCapacityUsed only one of them is
// returned. Exists the possibility that this worker is disabled and doesn't have valid version so can't
// run new tasks, so in this case the workers are sorted using version to ensure that if exists enable
// workers the comparator return one of them.
if(retVal == 0) {
retVal = zkWorker2.getWorker().getVersion().compareTo(zkWorker.getWorker().getVersion());
}
return retVal;
}
}
);
sortedWorkers.addAll(zkWorkers.values());
final String minWorkerVer = config.getMinWorkerVersion();
for (ImmutableWorkerInfo zkWorker : sortedWorkers) {
if (zkWorker.canRunTask(task) && zkWorker.isValidVersion(minWorkerVer)) {
return Optional.of(zkWorker);
}
}
return Optional.absent();
}
}