org.apache.solr.common.cloud.ClusterState Maven / Gradle / Ivy
package org.apache.solr.common.cloud;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.
*/
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.noggit.JSONWriter;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.SolrException.ErrorCode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.data.Stat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Immutable state of the cloud. Normally you can get the state by using
* {@link ZkStateReader#getClusterState()}.
* @lucene.experimental
*/
public class ClusterState implements JSONWriter.Writable {
private static Logger log = LoggerFactory.getLogger(ClusterState.class);
private Integer zkClusterStateVersion;
private final Map collectionStates; // Map>
private Set liveNodes;
private final ZkStateReader stateReader;
/**
* Use this constr when ClusterState is meant for publication.
*
* hashCode and equals will only depend on liveNodes and not clusterStateVersion.
*/
public ClusterState(Set liveNodes,
Map collectionStates) {
this(null, liveNodes, collectionStates, null);
}
/**
* @deprecated prefer another constructor
*/
public ClusterState(Integer zkClusterStateVersion, Set liveNodes,
Map collectionStates) {
this(zkClusterStateVersion, liveNodes, collectionStates, null);
}
/**
* Use this constr when ClusterState is meant for consumption.
*/
public ClusterState(Integer zkClusterStateVersion, Set liveNodes,
Map collectionStates, ZkStateReader stateReader) {
this.zkClusterStateVersion = zkClusterStateVersion;
this.liveNodes = new HashSet(liveNodes.size());
this.liveNodes.addAll(liveNodes);
this.collectionStates = new LinkedHashMap(collectionStates.size());
this.collectionStates.putAll(collectionStates);
this.stateReader = stateReader;
}
public ClusterState copyWith(Map modified){
ClusterState result = new ClusterState(zkClusterStateVersion, liveNodes,collectionStates,stateReader);
for (Entry e : modified.entrySet()) {
DocCollection c = e.getValue();
if(c == null) {
result.collectionStates.remove(e.getKey());
continue;
}
result.collectionStates.put(c.getName(), c);
}
return result;
}
/**
* Get the lead replica for specific collection, or null if one currently doesn't exist.
*/
public Replica getLeader(String collection, String sliceName) {
DocCollection coll = collectionStates.get(collection);
if (coll == null) return null;
Slice slice = coll.getSlice(sliceName);
if (slice == null) return null;
return slice.getLeader();
}
/**
* Gets the replica by the core name (assuming the slice is unknown) or null if replica is not found.
* If the slice is known, do not use this method.
* coreNodeName is the same as replicaName
*/
public Replica getReplica(final String collection, final String coreNodeName) {
return getReplica(collectionStates.get(collection), coreNodeName);
}
private Replica getReplica(DocCollection coll, String replicaName) {
if (coll == null) return null;
for(Slice slice: coll.getSlices()) {
Replica replica = slice.getReplica(replicaName);
if (replica != null) return replica;
}
return null;
}
public boolean hasCollection(String coll){
return collectionStates.get(coll)!=null;
}
/**
* Get the named Slice for collection, or null if not found.
*/
public Slice getSlice(String collection, String sliceName) {
DocCollection coll = collectionStates.get(collection);
if (coll == null) return null;
return coll.getSlice(sliceName);
}
public Map getSlicesMap(String collection) {
DocCollection coll = collectionStates.get(collection);
if (coll == null) return null;
return coll.getSlicesMap();
}
public Map getActiveSlicesMap(String collection) {
DocCollection coll = collectionStates.get(collection);
if (coll == null) return null;
return coll.getActiveSlicesMap();
}
public Collection getSlices(String collection) {
DocCollection coll = collectionStates.get(collection);
if (coll == null) return null;
return coll.getSlices();
}
public Collection getActiveSlices(String collection) {
DocCollection coll = collectionStates.get(collection);
if (coll == null) return null;
return coll.getActiveSlices();
}
public DocCollection getCollectionOrNull(String collection) {
return collectionStates.get(collection);
}
/**
* Get the named DocCollection object, or throw an exception if it doesn't exist.
*/
public DocCollection getCollection(String collection) {
DocCollection coll = collectionStates.get(collection);
if (coll == null) {
throw new SolrException(ErrorCode.BAD_REQUEST, "Could not find collection:" + collection);
}
return coll;
}
/**
* Get collection names.
*/
public Set getCollections() {
return Collections.unmodifiableSet(collectionStates.keySet());
}
/**
* @return Map<collectionName, Map<sliceName,Slice>>
*/
@Deprecated
public Map getCollectionStates() {
return Collections.unmodifiableMap(collectionStates);
}
/**
* Get names of the currently live nodes.
*/
public Set getLiveNodes() {
return Collections.unmodifiableSet(liveNodes);
}
public String getShardId(String nodeName, String coreName) {
// System.out.println("###### getShardId(" + baseUrl + "," + coreName + ") in " + collectionStates);
for (DocCollection coll : collectionStates.values()) {
for (Slice slice : coll.getSlices()) {
for (Replica replica : slice.getReplicas()) {
// TODO: for really large clusters, we could 'index' on this
String rnodeName = replica.getStr(ZkStateReader.NODE_NAME_PROP);
String rcore = replica.getStr(ZkStateReader.CORE_NAME_PROP);
if (nodeName.equals(rnodeName) && coreName.equals(rcore)) {
return slice.getName();
}
}
}
}
return null;
}
/**
* Check if node is alive.
*/
public boolean liveNodesContain(String name) {
return liveNodes.contains(name);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("live nodes:" + liveNodes);
sb.append(" collections:" + collectionStates);
return sb.toString();
}
/**
* Create ClusterState by reading the current state from zookeeper.
*/
public static ClusterState load(SolrZkClient zkClient, Set liveNodes, ZkStateReader stateReader) throws KeeperException, InterruptedException {
Stat stat = new Stat();
byte[] state = zkClient.getData(ZkStateReader.CLUSTER_STATE,
null, stat, true);
return load(stat.getVersion(), state, liveNodes, stateReader);
}
/**
* Create ClusterState from json string that is typically stored in zookeeper.
*
* Use {@link ClusterState#load(SolrZkClient, Set, ZkStateReader)} instead, unless you want to
* do something more when getting the data - such as get the stat, set watch, etc.
* @param version zk version of the clusterstate.json file (bytes)
* @param bytes clusterstate.json as a byte array
* @param liveNodes list of live nodes
* @return the ClusterState
*/
public static ClusterState load(Integer version, byte[] bytes, Set liveNodes, ZkStateReader stateReader) {
// System.out.println("######## ClusterState.load:" + (bytes==null ? null : new String(bytes)));
if (bytes == null || bytes.length == 0) {
return new ClusterState(version, liveNodes, Collections.emptyMap(),stateReader);
}
Map stateMap = (Map) ZkStateReader.fromJSON(bytes);
Map collections = new LinkedHashMap(stateMap.size());
for (Entry entry : stateMap.entrySet()) {
String collectionName = entry.getKey();
DocCollection coll = collectionFromObjects(collectionName, (Map)entry.getValue());
collections.put(collectionName, coll);
}
// System.out.println("######## ClusterState.load result:" + collections);
return new ClusterState(version, liveNodes, collections);
}
public static Aliases load(byte[] bytes) {
if (bytes == null || bytes.length == 0) {
return new Aliases();
}
Map> aliasMap = (Map>) ZkStateReader.fromJSON(bytes);
return new Aliases(aliasMap);
}
private static DocCollection collectionFromObjects(String name, Map objs) {
Map props;
Map slices;
Map sliceObjs = (Map)objs.get(DocCollection.SHARDS);
if (sliceObjs == null) {
// legacy format from 4.0... there was no separate "shards" level to contain the collection shards.
slices = makeSlices(objs);
props = Collections.emptyMap();
} else {
slices = makeSlices(sliceObjs);
props = new HashMap(objs);
objs.remove(DocCollection.SHARDS);
}
Object routerObj = props.get(DocCollection.DOC_ROUTER);
DocRouter router;
if (routerObj == null) {
router = DocRouter.DEFAULT;
} else if (routerObj instanceof String) {
// back compat with Solr4.4
router = DocRouter.getDocRouter((String)routerObj);
} else {
Map routerProps = (Map)routerObj;
router = DocRouter.getDocRouter(routerProps.get("name"));
}
return new DocCollection(name, slices, props, router);
}
private static Map makeSlices(Map genericSlices) {
if (genericSlices == null) return Collections.emptyMap();
Map result = new LinkedHashMap(genericSlices.size());
for (Map.Entry entry : genericSlices.entrySet()) {
String name = entry.getKey();
Object val = entry.getValue();
if (val instanceof Slice) {
result.put(name, (Slice)val);
} else if (val instanceof Map) {
result.put(name, new Slice(name, null, (Map)val));
}
}
return result;
}
@Override
public void write(JSONWriter jsonWriter) {
jsonWriter.write(collectionStates);
}
/**
* The version of clusterstate.json in ZooKeeper.
*
* @return null if ClusterState was created for publication, not consumption
*/
public Integer getZkClusterStateVersion() {
return zkClusterStateVersion;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result
+ ((zkClusterStateVersion == null) ? 0 : zkClusterStateVersion.hashCode());
result = prime * result + ((liveNodes == null) ? 0 : liveNodes.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
ClusterState other = (ClusterState) obj;
if (zkClusterStateVersion == null) {
if (other.zkClusterStateVersion != null) return false;
} else if (!zkClusterStateVersion.equals(other.zkClusterStateVersion)) return false;
if (liveNodes == null) {
if (other.liveNodes != null) return false;
} else if (!liveNodes.equals(other.liveNodes)) return false;
return true;
}
/**
* Internal API used only by ZkStateReader
*/
void setLiveNodes(Set liveNodes){
this.liveNodes = liveNodes;
}
}
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