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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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 org.elasticsearch.cluster.routing;
import com.carrotsearch.hppc.IntSet;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.common.collect.UnmodifiableIterator;
import org.elasticsearch.cluster.Diff;
import org.elasticsearch.cluster.Diffable;
import org.elasticsearch.cluster.DiffableUtils;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.index.IndexNotFoundException;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.index.shard.ShardNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import static com.google.common.collect.Maps.newHashMap;
/**
* Represents a global cluster-wide routing table for all indices including the
* version of the current routing state.
*
* @see IndexRoutingTable
*/
public class RoutingTable implements Iterable, Diffable {
public static RoutingTable PROTO = builder().build();
public static final RoutingTable EMPTY_ROUTING_TABLE = builder().build();
private final long version;
// index to IndexRoutingTable map
private final ImmutableMap indicesRouting;
RoutingTable(long version, Map indicesRouting) {
this.version = version;
this.indicesRouting = ImmutableMap.copyOf(indicesRouting);
}
/**
* Returns the version of the {@link RoutingTable}.
*
* @return version of the {@link RoutingTable}
*/
public long version() {
return this.version;
}
@Override
public UnmodifiableIterator iterator() {
return indicesRouting.values().iterator();
}
public boolean hasIndex(String index) {
return indicesRouting.containsKey(index);
}
public IndexRoutingTable index(String index) {
return indicesRouting.get(index);
}
public Map indicesRouting() {
return indicesRouting;
}
public Map getIndicesRouting() {
return indicesRouting();
}
/**
* All shards for the provided index and shard id
* @return All the shard routing entries for the given index and shard id
* @throws IndexNotFoundException if provided index does not exist
* @throws ShardNotFoundException if provided shard id is unknown
*/
public IndexShardRoutingTable shardRoutingTable(String index, int shardId) {
IndexRoutingTable indexRouting = index(index);
if (indexRouting == null) {
throw new IndexNotFoundException(index);
}
IndexShardRoutingTable shard = indexRouting.shard(shardId);
if (shard == null) {
throw new ShardNotFoundException(new ShardId(index, shardId));
}
return shard;
}
public RoutingTable validateRaiseException(MetaData metaData) throws RoutingValidationException {
RoutingTableValidation validation = validate(metaData);
if (!validation.valid()) {
throw new RoutingValidationException(validation);
}
return this;
}
public RoutingTableValidation validate(MetaData metaData) {
RoutingTableValidation validation = new RoutingTableValidation();
for (IndexRoutingTable indexRoutingTable : this) {
indexRoutingTable.validate(validation, metaData);
}
return validation;
}
public List shardsWithState(ShardRoutingState state) {
List shards = new ArrayList<>();
for (IndexRoutingTable indexRoutingTable : this) {
shards.addAll(indexRoutingTable.shardsWithState(state));
}
return shards;
}
/**
* All the shards (replicas) for all indices in this routing table.
*
* @return All the shards
*/
public List allShards() {
List shards = new ArrayList<>();
String[] indices = indicesRouting.keySet().toArray(new String[indicesRouting.keySet().size()]);
for (String index : indices) {
List allShardsIndex = allShards(index);
shards.addAll(allShardsIndex);
}
return shards;
}
/**
* All the shards (replicas) for the provided index.
*
* @param index The index to return all the shards (replicas).
* @return All the shards matching the specific index
* @throws IndexNotFoundException If the index passed does not exists
*/
public List allShards(String index) {
List shards = new ArrayList<>();
IndexRoutingTable indexRoutingTable = index(index);
if (indexRoutingTable == null) {
throw new IndexNotFoundException(index);
}
for (IndexShardRoutingTable indexShardRoutingTable : indexRoutingTable) {
for (ShardRouting shardRouting : indexShardRoutingTable) {
shards.add(shardRouting);
}
}
return shards;
}
public GroupShardsIterator allActiveShardsGrouped(String[] indices, boolean includeEmpty) {
return allActiveShardsGrouped(indices, includeEmpty, false);
}
/**
* Return GroupShardsIterator where each active shard routing has it's own shard iterator.
*
* @param includeEmpty if true, a shard iterator will be added for non-assigned shards as well
* @param includeRelocationTargets if true, an extra shard iterator will be added for relocating shards. The extra
* iterator contains a single ShardRouting pointing at the relocating target
*/
public GroupShardsIterator allActiveShardsGrouped(String[] indices, boolean includeEmpty, boolean includeRelocationTargets) {
return allSatisfyingPredicateShardsGrouped(indices, includeEmpty, includeRelocationTargets, ACTIVE_PREDICATE);
}
public GroupShardsIterator allAssignedShardsGrouped(String[] indices, boolean includeEmpty) {
return allAssignedShardsGrouped(indices, includeEmpty, false);
}
/**
* Return GroupShardsIterator where each assigned shard routing has it's own shard iterator.
*
* @param includeEmpty if true, a shard iterator will be added for non-assigned shards as well
* @param includeRelocationTargets if true, an extra shard iterator will be added for relocating shards. The extra
* iterator contains a single ShardRouting pointing at the relocating target
*/
public GroupShardsIterator allAssignedShardsGrouped(String[] indices, boolean includeEmpty, boolean includeRelocationTargets) {
return allSatisfyingPredicateShardsGrouped(indices, includeEmpty, includeRelocationTargets, ASSIGNED_PREDICATE);
}
private static Predicate ACTIVE_PREDICATE = new Predicate() {
@Override
public boolean apply(ShardRouting shardRouting) {
return shardRouting.active();
}
};
private static Predicate ASSIGNED_PREDICATE = new Predicate() {
@Override
public boolean apply(ShardRouting shardRouting) {
return shardRouting.assignedToNode();
}
};
private GroupShardsIterator allSatisfyingPredicateShardsGrouped(String[] indices, boolean includeEmpty, boolean includeRelocationTargets, Predicate predicate) {
// use list here since we need to maintain identity across shards
ArrayList set = new ArrayList<>();
for (String index : indices) {
IndexRoutingTable indexRoutingTable = index(index);
if (indexRoutingTable == null) {
continue;
// we simply ignore indices that don't exists (make sense for operations that use it currently)
}
for (IndexShardRoutingTable indexShardRoutingTable : indexRoutingTable) {
for (ShardRouting shardRouting : indexShardRoutingTable) {
if (predicate.apply(shardRouting)) {
set.add(shardRouting.shardsIt());
if (includeRelocationTargets && shardRouting.relocating()) {
set.add(new PlainShardIterator(shardRouting.shardId(), Collections.singletonList(shardRouting.buildTargetRelocatingShard())));
}
} else if (includeEmpty) { // we need this for counting properly, just make it an empty one
set.add(new PlainShardIterator(shardRouting.shardId(), Collections.emptyList()));
}
}
}
}
return new GroupShardsIterator(set);
}
public ShardsIterator allShards(String[] indices) {
return allShardsSatisfyingPredicate(indices, Predicates.alwaysTrue(), false);
}
public ShardsIterator allShardsIncludingRelocationTargets(String[] indices) {
return allShardsSatisfyingPredicate(indices, Predicates.alwaysTrue(), true);
}
private ShardsIterator allShardsSatisfyingPredicate(String[] indices, Predicate predicate, boolean includeRelocationTargets) {
// use list here since we need to maintain identity across shards
List shards = new ArrayList<>();
for (String index : indices) {
IndexRoutingTable indexRoutingTable = index(index);
if (indexRoutingTable == null) {
continue;
// we simply ignore indices that don't exists (make sense for operations that use it currently)
}
for (IndexShardRoutingTable indexShardRoutingTable : indexRoutingTable) {
for (ShardRouting shardRouting : indexShardRoutingTable) {
if (predicate.apply(shardRouting)) {
shards.add(shardRouting);
if (includeRelocationTargets && shardRouting.relocating()) {
shards.add(shardRouting.buildTargetRelocatingShard());
}
}
}
}
}
return new PlainShardsIterator(shards);
}
/**
* All the *active* primary shards for the provided indices grouped (each group is a single element, consisting
* of the primary shard). This is handy for components that expect to get group iterators, but still want in some
* cases to iterate over all primary shards (and not just one shard in replication group).
*
* @param indices The indices to return all the shards (replicas)
* @return All the primary shards grouped into a single shard element group each
* @throws IndexNotFoundException If an index passed does not exists
* @see IndexRoutingTable#groupByAllIt()
*/
public GroupShardsIterator activePrimaryShardsGrouped(String[] indices, boolean includeEmpty) {
// use list here since we need to maintain identity across shards
ArrayList set = new ArrayList<>();
for (String index : indices) {
IndexRoutingTable indexRoutingTable = index(index);
if (indexRoutingTable == null) {
throw new IndexNotFoundException(index);
}
for (IndexShardRoutingTable indexShardRoutingTable : indexRoutingTable) {
ShardRouting primary = indexShardRoutingTable.primaryShard();
if (primary.active()) {
set.add(primary.shardsIt());
} else if (includeEmpty) { // we need this for counting properly, just make it an empty one
set.add(new PlainShardIterator(primary.shardId(), Collections.emptyList()));
}
}
}
return new GroupShardsIterator(set);
}
@Override
public Diff diff(RoutingTable previousState) {
return new RoutingTableDiff(previousState, this);
}
@Override
public Diff readDiffFrom(StreamInput in) throws IOException {
return new RoutingTableDiff(in);
}
@Override
public RoutingTable readFrom(StreamInput in) throws IOException {
Builder builder = new Builder();
builder.version = in.readLong();
int size = in.readVInt();
for (int i = 0; i < size; i++) {
IndexRoutingTable index = IndexRoutingTable.Builder.readFrom(in);
builder.add(index);
}
return builder.build();
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeLong(version);
out.writeVInt(indicesRouting.size());
for (IndexRoutingTable index : indicesRouting.values()) {
index.writeTo(out);
}
}
private static class RoutingTableDiff implements Diff {
private final long version;
private final Diff> indicesRouting;
public RoutingTableDiff(RoutingTable before, RoutingTable after) {
version = after.version;
indicesRouting = DiffableUtils.diff(before.indicesRouting, after.indicesRouting);
}
public RoutingTableDiff(StreamInput in) throws IOException {
version = in.readLong();
indicesRouting = DiffableUtils.readImmutableMapDiff(in, IndexRoutingTable.PROTO);
}
@Override
public RoutingTable apply(RoutingTable part) {
return new RoutingTable(version, indicesRouting.apply(part.indicesRouting));
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeLong(version);
indicesRouting.writeTo(out);
}
}
public static Builder builder() {
return new Builder();
}
public static Builder builder(RoutingTable routingTable) {
return new Builder(routingTable);
}
public static class Builder {
private long version;
private final Map indicesRouting = newHashMap();
public Builder() {
}
public Builder(RoutingTable routingTable) {
version = routingTable.version;
for (IndexRoutingTable indexRoutingTable : routingTable) {
indicesRouting.put(indexRoutingTable.index(), indexRoutingTable);
}
}
public Builder updateNodes(RoutingNodes routingNodes) {
// this is being called without pre initializing the routing table, so we must copy over the version as well
this.version = routingNodes.routingTable().version();
Map indexRoutingTableBuilders = newHashMap();
for (RoutingNode routingNode : routingNodes) {
for (ShardRouting shardRoutingEntry : routingNode) {
// every relocating shard has a double entry, ignore the target one.
if (shardRoutingEntry.initializing() && shardRoutingEntry.relocatingNodeId() != null)
continue;
String index = shardRoutingEntry.index();
IndexRoutingTable.Builder indexBuilder = indexRoutingTableBuilders.get(index);
if (indexBuilder == null) {
indexBuilder = new IndexRoutingTable.Builder(index);
indexRoutingTableBuilders.put(index, indexBuilder);
}
IndexShardRoutingTable refData = routingNodes.routingTable().index(shardRoutingEntry.index()).shard(shardRoutingEntry.id());
indexBuilder.addShard(refData, shardRoutingEntry);
}
}
for (ShardRouting shardRoutingEntry : Iterables.concat(routingNodes.unassigned(), routingNodes.unassigned().ignored())) {
String index = shardRoutingEntry.index();
IndexRoutingTable.Builder indexBuilder = indexRoutingTableBuilders.get(index);
if (indexBuilder == null) {
indexBuilder = new IndexRoutingTable.Builder(index);
indexRoutingTableBuilders.put(index, indexBuilder);
}
IndexShardRoutingTable refData = routingNodes.routingTable().index(shardRoutingEntry.index()).shard(shardRoutingEntry.id());
indexBuilder.addShard(refData, shardRoutingEntry);
}
for (IndexRoutingTable.Builder indexBuilder : indexRoutingTableBuilders.values()) {
add(indexBuilder);
}
return this;
}
public Builder updateNumberOfReplicas(int numberOfReplicas, String... indices) {
if (indices == null || indices.length == 0) {
indices = indicesRouting.keySet().toArray(new String[indicesRouting.keySet().size()]);
}
for (String index : indices) {
IndexRoutingTable indexRoutingTable = indicesRouting.get(index);
if (indexRoutingTable == null) {
// ignore index missing failure, its closed...
continue;
}
int currentNumberOfReplicas = indexRoutingTable.shards().get(0).size() - 1; // remove the required primary
IndexRoutingTable.Builder builder = new IndexRoutingTable.Builder(index);
// re-add all the shards
for (IndexShardRoutingTable indexShardRoutingTable : indexRoutingTable) {
builder.addIndexShard(indexShardRoutingTable);
}
if (currentNumberOfReplicas < numberOfReplicas) {
// now, add "empty" ones
for (int i = 0; i < (numberOfReplicas - currentNumberOfReplicas); i++) {
builder.addReplica();
}
} else if (currentNumberOfReplicas > numberOfReplicas) {
int delta = currentNumberOfReplicas - numberOfReplicas;
if (delta <= 0) {
// ignore, can't remove below the current one...
} else {
for (int i = 0; i < delta; i++) {
builder.removeReplica();
}
}
}
indicesRouting.put(index, builder.build());
}
return this;
}
public Builder addAsNew(IndexMetaData indexMetaData) {
if (indexMetaData.getState() == IndexMetaData.State.OPEN) {
IndexRoutingTable.Builder indexRoutingBuilder = new IndexRoutingTable.Builder(indexMetaData.getIndex())
.initializeAsNew(indexMetaData);
add(indexRoutingBuilder);
}
return this;
}
public Builder addAsRecovery(IndexMetaData indexMetaData) {
if (indexMetaData.getState() == IndexMetaData.State.OPEN) {
IndexRoutingTable.Builder indexRoutingBuilder = new IndexRoutingTable.Builder(indexMetaData.getIndex())
.initializeAsRecovery(indexMetaData);
add(indexRoutingBuilder);
}
return this;
}
public Builder addAsFromDangling(IndexMetaData indexMetaData) {
if (indexMetaData.getState() == IndexMetaData.State.OPEN) {
IndexRoutingTable.Builder indexRoutingBuilder = new IndexRoutingTable.Builder(indexMetaData.getIndex())
.initializeAsFromDangling(indexMetaData);
add(indexRoutingBuilder);
}
return this;
}
public Builder addAsFromCloseToOpen(IndexMetaData indexMetaData) {
if (indexMetaData.getState() == IndexMetaData.State.OPEN) {
IndexRoutingTable.Builder indexRoutingBuilder = new IndexRoutingTable.Builder(indexMetaData.getIndex())
.initializeAsFromCloseToOpen(indexMetaData);
add(indexRoutingBuilder);
}
return this;
}
public Builder addAsRestore(IndexMetaData indexMetaData, RestoreSource restoreSource) {
IndexRoutingTable.Builder indexRoutingBuilder = new IndexRoutingTable.Builder(indexMetaData.getIndex())
.initializeAsRestore(indexMetaData, restoreSource);
add(indexRoutingBuilder);
return this;
}
public Builder addAsNewRestore(IndexMetaData indexMetaData, RestoreSource restoreSource, IntSet ignoreShards) {
IndexRoutingTable.Builder indexRoutingBuilder = new IndexRoutingTable.Builder(indexMetaData.getIndex())
.initializeAsNewRestore(indexMetaData, restoreSource, ignoreShards);
add(indexRoutingBuilder);
return this;
}
public Builder add(IndexRoutingTable indexRoutingTable) {
indexRoutingTable.validate();
indicesRouting.put(indexRoutingTable.index(), indexRoutingTable);
return this;
}
public Builder add(IndexRoutingTable.Builder indexRoutingTableBuilder) {
add(indexRoutingTableBuilder.build());
return this;
}
public Builder indicesRouting(ImmutableMap indicesRouting) {
this.indicesRouting.putAll(indicesRouting);
return this;
}
public Builder remove(String index) {
indicesRouting.remove(index);
return this;
}
public Builder version(long version) {
this.version = version;
return this;
}
public RoutingTable build() {
// normalize the versions right before we build it...
for (IndexRoutingTable indexRoutingTable : indicesRouting.values()) {
indicesRouting.put(indexRoutingTable.index(), indexRoutingTable.normalizeVersions());
}
return new RoutingTable(version, indicesRouting);
}
public static RoutingTable readFrom(StreamInput in) throws IOException {
return PROTO.readFrom(in);
}
}
public String prettyPrint() {
StringBuilder sb = new StringBuilder("routing_table (version ").append(version).append("):\n");
for (Map.Entry entry : indicesRouting.entrySet()) {
sb.append(entry.getValue().prettyPrint()).append('\n');
}
return sb.toString();
}
}