org.elasticsearch.action.ingest.IngestActionForwarder Maven / Gradle / Ivy
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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.action.ingest;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.ActionListenerResponseHandler;
import org.elasticsearch.action.ActionRequest;
import org.elasticsearch.action.ActionType;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterStateApplier;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.Randomness;
import org.elasticsearch.transport.TransportService;
import java.util.concurrent.atomic.AtomicInteger;
/**
* A utility for forwarding ingest requests to ingest nodes in a round-robin fashion.
*
* TODO: move this into IngestService and make index/bulk actions call that
*/
public final class IngestActionForwarder implements ClusterStateApplier {
private final TransportService transportService;
private final AtomicInteger ingestNodeGenerator = new AtomicInteger(Randomness.get().nextInt());
private DiscoveryNode[] ingestNodes;
public IngestActionForwarder(TransportService transportService) {
this.transportService = transportService;
ingestNodes = new DiscoveryNode[0];
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public void forwardIngestRequest(ActionType action, ActionRequest request, ActionListener listener) {
transportService.sendRequest(
randomIngestNode(),
action.name(),
request,
new ActionListenerResponseHandler(listener, action.getResponseReader())
);
}
private DiscoveryNode randomIngestNode() {
final DiscoveryNode[] nodes = ingestNodes;
if (nodes.length == 0) {
throw new IllegalStateException("There are no ingest nodes in this cluster, unable to forward request to an ingest node.");
}
return nodes[Math.floorMod(ingestNodeGenerator.incrementAndGet(), nodes.length)];
}
@Override
public void applyClusterState(ClusterChangedEvent event) {
ingestNodes = event.state().getNodes().getIngestNodes().values().toArray(DiscoveryNode[]::new);
}
}