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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.action.admin.indices.shards;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.lucene.util.CollectionUtil;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.FailedNodeException;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.master.TransportMasterNodeReadAction;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.health.ClusterHealthStatus;
import org.elasticsearch.cluster.health.ClusterShardHealth;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.IndexRoutingTable;
import org.elasticsearch.cluster.routing.IndexShardRoutingTable;
import org.elasticsearch.cluster.routing.RoutingNodes;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.collect.ImmutableOpenIntMap;
import org.elasticsearch.common.collect.ImmutableOpenMap;
import org.elasticsearch.common.collect.Tuple;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.util.concurrent.CountDown;
import org.elasticsearch.gateway.AsyncShardFetch;
import org.elasticsearch.gateway.TransportNodesListGatewayStartedShards;
import org.elasticsearch.gateway.TransportNodesListGatewayStartedShards.NodeGatewayStartedShards;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.ConcurrentLinkedQueue;
/**
* Transport action that reads the cluster state for shards with the requested criteria (see {@link ClusterHealthStatus}) of specific
* indices and fetches store information from all the nodes using {@link TransportNodesListGatewayStartedShards}
*/
public class TransportIndicesShardStoresAction
extends TransportMasterNodeReadAction {
private static final Logger logger = LogManager.getLogger(TransportIndicesShardStoresAction.class);
private final TransportNodesListGatewayStartedShards listShardStoresInfo;
@Inject
public TransportIndicesShardStoresAction(TransportService transportService, ClusterService clusterService,
ThreadPool threadPool, ActionFilters actionFilters,
IndexNameExpressionResolver indexNameExpressionResolver,
TransportNodesListGatewayStartedShards listShardStoresInfo) {
super(IndicesShardStoresAction.NAME, transportService, clusterService, threadPool, actionFilters,
IndicesShardStoresRequest::new, indexNameExpressionResolver);
this.listShardStoresInfo = listShardStoresInfo;
}
@Override
protected String executor() {
return ThreadPool.Names.SAME;
}
@Override
protected IndicesShardStoresResponse read(StreamInput in) throws IOException {
return new IndicesShardStoresResponse(in);
}
@Override
protected void masterOperation(IndicesShardStoresRequest request, ClusterState state,
ActionListener listener) {
final RoutingTable routingTables = state.routingTable();
final RoutingNodes routingNodes = state.getRoutingNodes();
final String[] concreteIndices = indexNameExpressionResolver.concreteIndexNames(state, request);
final Set> shardsToFetch = new HashSet<>();
logger.trace("using cluster state version [{}] to determine shards", state.version());
// collect relevant shard ids of the requested indices for fetching store infos
for (String index : concreteIndices) {
IndexRoutingTable indexShardRoutingTables = routingTables.index(index);
if (indexShardRoutingTables == null) {
continue;
}
final String customDataPath = IndexMetaData.INDEX_DATA_PATH_SETTING.get(state.metaData().index(index).getSettings());
for (IndexShardRoutingTable routing : indexShardRoutingTables) {
final int shardId = routing.shardId().id();
ClusterShardHealth shardHealth = new ClusterShardHealth(shardId, routing);
if (request.shardStatuses().contains(shardHealth.getStatus())) {
shardsToFetch.add(Tuple.tuple(routing.shardId(), customDataPath));
}
}
}
// async fetch store infos from all the nodes
// NOTE: instead of fetching shard store info one by one from every node (nShards * nNodes requests)
// we could fetch all shard store info from every node once (nNodes requests)
// we have to implement a TransportNodesAction instead of using TransportNodesListGatewayStartedShards
// for fetching shard stores info, that operates on a list of shards instead of a single shard
new AsyncShardStoresInfoFetches(state.nodes(), routingNodes, shardsToFetch, listener).start();
}
@Override
protected ClusterBlockException checkBlock(IndicesShardStoresRequest request, ClusterState state) {
return state.blocks().indicesBlockedException(ClusterBlockLevel.METADATA_READ,
indexNameExpressionResolver.concreteIndexNames(state, request));
}
private class AsyncShardStoresInfoFetches {
private final DiscoveryNodes nodes;
private final RoutingNodes routingNodes;
private final Set> shards;
private final ActionListener listener;
private CountDown expectedOps;
private final Queue fetchResponses;
AsyncShardStoresInfoFetches(DiscoveryNodes nodes, RoutingNodes routingNodes, Set> shards,
ActionListener listener) {
this.nodes = nodes;
this.routingNodes = routingNodes;
this.shards = shards;
this.listener = listener;
this.fetchResponses = new ConcurrentLinkedQueue<>();
this.expectedOps = new CountDown(shards.size());
}
void start() {
if (shards.isEmpty()) {
listener.onResponse(new IndicesShardStoresResponse());
} else {
for (Tuple shard : shards) {
InternalAsyncFetch fetch = new InternalAsyncFetch(logger, "shard_stores", shard.v1(), shard.v2(), listShardStoresInfo);
fetch.fetchData(nodes, Collections.emptySet());
}
}
}
private class InternalAsyncFetch extends AsyncShardFetch {
InternalAsyncFetch(Logger logger, String type, ShardId shardId, String customDataPath,
TransportNodesListGatewayStartedShards action) {
super(logger, type, shardId, customDataPath, action);
}
@Override
protected synchronized void processAsyncFetch(List responses, List failures,
long fetchingRound) {
fetchResponses.add(new Response(shardId, responses, failures));
if (expectedOps.countDown()) {
finish();
}
}
void finish() {
ImmutableOpenMap.Builder>>
indicesStoreStatusesBuilder = ImmutableOpenMap.builder();
java.util.List failureBuilder = new ArrayList<>();
for (Response fetchResponse : fetchResponses) {
ImmutableOpenIntMap> indexStoreStatuses =
indicesStoreStatusesBuilder.get(fetchResponse.shardId.getIndexName());
final ImmutableOpenIntMap.Builder> indexShardsBuilder;
if (indexStoreStatuses == null) {
indexShardsBuilder = ImmutableOpenIntMap.builder();
} else {
indexShardsBuilder = ImmutableOpenIntMap.builder(indexStoreStatuses);
}
java.util.List storeStatuses = indexShardsBuilder
.get(fetchResponse.shardId.id());
if (storeStatuses == null) {
storeStatuses = new ArrayList<>();
}
for (NodeGatewayStartedShards response : fetchResponse.responses) {
if (shardExistsInNode(response)) {
IndicesShardStoresResponse.StoreStatus.AllocationStatus allocationStatus = getAllocationStatus(
fetchResponse.shardId.getIndexName(), fetchResponse.shardId.id(), response.getNode());
storeStatuses.add(new IndicesShardStoresResponse.StoreStatus(response.getNode(), response.allocationId(),
allocationStatus, response.storeException()));
}
}
CollectionUtil.timSort(storeStatuses);
indexShardsBuilder.put(fetchResponse.shardId.id(), storeStatuses);
indicesStoreStatusesBuilder.put(fetchResponse.shardId.getIndexName(), indexShardsBuilder.build());
for (FailedNodeException failure : fetchResponse.failures) {
failureBuilder.add(new IndicesShardStoresResponse.Failure(failure.nodeId(), fetchResponse.shardId.getIndexName(),
fetchResponse.shardId.id(), failure.getCause()));
}
}
listener.onResponse(new IndicesShardStoresResponse(indicesStoreStatusesBuilder.build(),
Collections.unmodifiableList(failureBuilder)));
}
private IndicesShardStoresResponse.StoreStatus.AllocationStatus getAllocationStatus(String index, int shardID,
DiscoveryNode node) {
for (ShardRouting shardRouting : routingNodes.node(node.getId())) {
ShardId shardId = shardRouting.shardId();
if (shardId.id() == shardID && shardId.getIndexName().equals(index)) {
if (shardRouting.primary()) {
return IndicesShardStoresResponse.StoreStatus.AllocationStatus.PRIMARY;
} else if (shardRouting.assignedToNode()) {
return IndicesShardStoresResponse.StoreStatus.AllocationStatus.REPLICA;
} else {
return IndicesShardStoresResponse.StoreStatus.AllocationStatus.UNUSED;
}
}
}
return IndicesShardStoresResponse.StoreStatus.AllocationStatus.UNUSED;
}
/**
* A shard exists/existed in a node only if shard state file exists in the node
*/
private boolean shardExistsInNode(final NodeGatewayStartedShards response) {
return response.storeException() != null || response.allocationId() != null;
}
@Override
protected void reroute(ShardId shardId, String reason) {
// no-op
}
public class Response {
private final ShardId shardId;
private final List responses;
private final List failures;
Response(ShardId shardId, List responses, List failures) {
this.shardId = shardId;
this.responses = responses;
this.failures = failures;
}
}
}
}
}