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/*
* 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.cluster.routing.allocation;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.routing.allocation.decider.Decision;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.core.Nullable;
import org.elasticsearch.xcontent.ToXContentFragment;
import org.elasticsearch.xcontent.ToXContentObject;
import org.elasticsearch.xcontent.XContentBuilder;
import java.io.IOException;
import java.util.Comparator;
import static org.elasticsearch.cluster.routing.allocation.AbstractAllocationDecision.discoveryNodeToXContent;
/**
* This class represents the shard allocation decision and its explanation for a single node.
*/
public class NodeAllocationResult implements ToXContentObject, Writeable, Comparable {
private static final Comparator nodeResultComparator = Comparator.comparing(NodeAllocationResult::getNodeDecision)
.thenComparingInt(NodeAllocationResult::getWeightRanking)
.thenComparing(r -> r.getNode().getId());
private final DiscoveryNode node;
@Nullable
private final ShardStoreInfo shardStoreInfo;
private final AllocationDecision nodeDecision;
@Nullable
private final Decision canAllocateDecision;
private final int weightRanking;
public NodeAllocationResult(DiscoveryNode node, ShardStoreInfo shardStoreInfo, @Nullable Decision decision) {
this.node = node;
this.shardStoreInfo = shardStoreInfo;
this.canAllocateDecision = decision;
this.nodeDecision = decision != null ? AllocationDecision.fromDecisionType(canAllocateDecision.type()) : AllocationDecision.NO;
this.weightRanking = 0;
}
public NodeAllocationResult(DiscoveryNode node, AllocationDecision nodeDecision, Decision canAllocate, int weightRanking) {
this.node = node;
this.shardStoreInfo = null;
this.canAllocateDecision = canAllocate;
this.nodeDecision = nodeDecision;
this.weightRanking = weightRanking;
}
public NodeAllocationResult(DiscoveryNode node, Decision decision, int weightRanking) {
this.node = node;
this.shardStoreInfo = null;
this.canAllocateDecision = decision;
this.nodeDecision = AllocationDecision.fromDecisionType(decision.type());
this.weightRanking = weightRanking;
}
public NodeAllocationResult(StreamInput in) throws IOException {
node = new DiscoveryNode(in);
shardStoreInfo = in.readOptionalWriteable(ShardStoreInfo::new);
canAllocateDecision = in.readOptionalWriteable(Decision::readFrom);
nodeDecision = AllocationDecision.readFrom(in);
weightRanking = in.readVInt();
}
@Override
public void writeTo(StreamOutput out) throws IOException {
node.writeTo(out);
out.writeOptionalWriteable(shardStoreInfo);
out.writeOptionalWriteable(canAllocateDecision);
nodeDecision.writeTo(out);
out.writeVInt(weightRanking);
}
/**
* Get the node that this decision is for.
*/
public DiscoveryNode getNode() {
return node;
}
/**
* Get the shard store information for the node, if it exists.
*/
@Nullable
public ShardStoreInfo getShardStoreInfo() {
return shardStoreInfo;
}
/**
* The decision details for allocating to this node. Returns {@code null} if
* no allocation decision was taken on the node; in this case, {@link #getNodeDecision()}
* will return {@link AllocationDecision#NO}.
*/
@Nullable
public Decision getCanAllocateDecision() {
return canAllocateDecision;
}
/**
* Is the weight assigned for the node?
*/
public boolean isWeightRanked() {
return weightRanking > 0;
}
/**
* The weight ranking for allocating a shard to the node. Each node will have
* a unique weight ranking that is relative to the other nodes against which the
* deciders ran. For example, suppose there are 3 nodes which the allocation deciders
* decided upon: node1, node2, and node3. If node2 had the best weight for holding the
* shard, followed by node3, followed by node1, then node2's weight will be 1, node3's
* weight will be 2, and node1's weight will be 1. A value of 0 means the weight was
* not calculated or factored into the decision.
*/
public int getWeightRanking() {
return weightRanking;
}
/**
* Gets the {@link AllocationDecision} for allocating to this node.
*/
public AllocationDecision getNodeDecision() {
return nodeDecision;
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject();
{
discoveryNodeToXContent(node, false, builder);
builder.field("node_decision", nodeDecision);
if (shardStoreInfo != null) {
shardStoreInfo.toXContent(builder, params);
}
if (isWeightRanked()) {
builder.field("weight_ranking", getWeightRanking());
}
if (canAllocateDecision != null && canAllocateDecision.getDecisions().isEmpty() == false) {
builder.startArray("deciders");
canAllocateDecision.toXContent(builder, params);
builder.endArray();
}
}
builder.endObject();
return builder;
}
@Override
public int compareTo(NodeAllocationResult other) {
return nodeResultComparator.compare(this, other);
}
/** A class that captures metadata about a shard store on a node. */
public static final class ShardStoreInfo implements ToXContentFragment, Writeable {
private final boolean inSync;
@Nullable
private final String allocationId;
private final long matchingBytes;
@Nullable
private final Exception storeException;
public ShardStoreInfo(String allocationId, boolean inSync, Exception storeException) {
this.inSync = inSync;
this.allocationId = allocationId;
this.matchingBytes = -1;
this.storeException = storeException;
}
public ShardStoreInfo(long matchingBytes) {
this.inSync = false;
this.allocationId = null;
this.matchingBytes = matchingBytes;
this.storeException = null;
}
public ShardStoreInfo(StreamInput in) throws IOException {
this.inSync = in.readBoolean();
this.allocationId = in.readOptionalString();
this.matchingBytes = in.readLong();
this.storeException = in.readException();
}
/**
* Returns {@code true} if the shard copy is in-sync and contains the latest data.
* Returns {@code false} if the shard copy is stale or if the shard copy being examined
* is for a replica shard allocation.
*/
public boolean isInSync() {
return inSync;
}
/**
* Gets the allocation id for the shard copy, if it exists.
*/
@Nullable
public String getAllocationId() {
return allocationId;
}
/**
* Returns {@code true} if the shard copy has a matching sync id with the primary shard.
* Returns {@code false} if the shard copy does not have a matching sync id with the primary
* shard, or this explanation pertains to the allocation of a primary shard, in which case
* matching sync ids are irrelevant.
*/
public boolean hasMatchingSyncId() {
return matchingBytes == Long.MAX_VALUE;
}
/**
* Gets the number of matching bytes the shard copy has with the primary shard.
* Returns {@code Long.MAX_VALUE} if {@link #hasMatchingSyncId()} returns {@code true}.
* Returns -1 if not applicable (this value only applies to assigning replica shards).
*/
public long getMatchingBytes() {
return matchingBytes;
}
/**
* Gets the store exception when trying to read the store, if there was an error. If
* there was no error, returns {@code null}.
*/
@Nullable
public Exception getStoreException() {
return storeException;
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeBoolean(inSync);
out.writeOptionalString(allocationId);
out.writeLong(matchingBytes);
out.writeException(storeException);
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject("store");
{
if (matchingBytes < 0) {
// dealing with a primary shard
if (allocationId == null && storeException == null) {
// there was no information we could obtain of any shard data on the node
builder.field("found", false);
} else {
builder.field("in_sync", inSync);
}
}
if (allocationId != null) {
builder.field("allocation_id", allocationId);
}
if (matchingBytes >= 0) {
if (hasMatchingSyncId()) {
builder.field("matching_sync_id", true);
} else {
builder.humanReadableField("matching_size_in_bytes", "matching_size", new ByteSizeValue(matchingBytes));
}
}
if (storeException != null) {
builder.startObject("store_exception");
ElasticsearchException.generateThrowableXContent(builder, params, storeException);
builder.endObject();
}
}
builder.endObject();
return builder;
}
}
}
