AssignedJobBuilder.java

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//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.doris.nereids.trees.plans.distribute.worker.job;

import org.apache.doris.nereids.trees.plans.distribute.DistributeContext;
import org.apache.doris.nereids.trees.plans.distribute.worker.BackendDistributedPlanWorkerManager;
import org.apache.doris.planner.ExchangeNode;
import org.apache.doris.planner.PlanFragmentId;
import org.apache.doris.thrift.TExplainLevel;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

/** AssignedJobBuilder */
public class AssignedJobBuilder {
    /** buildJobs */
    public static ListMultimap<PlanFragmentId, AssignedJob> buildJobs(
            Map<PlanFragmentId, UnassignedJob> unassignedJobs, BackendDistributedPlanWorkerManager workerManager,
            boolean isLoadJob) {
        DistributeContext distributeContext = new DistributeContext(workerManager, isLoadJob);
        ListMultimap<PlanFragmentId, AssignedJob> allAssignedJobs = ArrayListMultimap.create();
        for (Entry<PlanFragmentId, UnassignedJob> kv : unassignedJobs.entrySet()) {
            PlanFragmentId fragmentId = kv.getKey();
            UnassignedJob unassignedJob = kv.getValue();
            ListMultimap<ExchangeNode, AssignedJob> inputAssignedJobs
                    = getInputAssignedJobs(unassignedJob, allAssignedJobs);
            List<AssignedJob> fragmentAssignedJobs =
                    unassignedJob.computeAssignedJobs(distributeContext, inputAssignedJobs);
            for (AssignedJob assignedJob : fragmentAssignedJobs) {
                distributeContext.selectedWorkers.onCreateAssignedJob(assignedJob);
            }

            if (fragmentAssignedJobs.isEmpty()) {
                throw new IllegalStateException("Fragment has no instance, unassignedJob: " + unassignedJob
                        + ", fragment: " + unassignedJob.getFragment().getExplainString(TExplainLevel.VERBOSE));
            }
            allAssignedJobs.putAll(fragmentId, fragmentAssignedJobs);
        }
        return allAssignedJobs;
    }

    private static ListMultimap<ExchangeNode, AssignedJob> getInputAssignedJobs(
            UnassignedJob unassignedJob, ListMultimap<PlanFragmentId, AssignedJob> assignedJobs) {
        ListMultimap<ExchangeNode, AssignedJob> inputJobs = ArrayListMultimap.create();
        for (Entry<ExchangeNode, Collection<UnassignedJob>> exchangeNodeToChildJobs
                : unassignedJob.getExchangeToChildJob().asMap().entrySet()) {
            ExchangeNode exchangeNode = exchangeNodeToChildJobs.getKey();
            Collection<UnassignedJob> childJobs = exchangeNodeToChildJobs.getValue();
            for (UnassignedJob childJob : childJobs) {
                inputJobs.putAll(exchangeNode, assignedJobs.get(childJob.getFragment().getFragmentId()));
            }
        }
        return inputJobs;
    }
}