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Elasticsearch - Open Source, Distributed, RESTful Search Engine
/*
* 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;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.LatchedActionListener;
import org.elasticsearch.action.admin.cluster.node.stats.NodeStats;
import org.elasticsearch.action.admin.cluster.node.stats.NodesStatsRequest;
import org.elasticsearch.action.admin.cluster.node.stats.NodesStatsResponse;
import org.elasticsearch.action.admin.cluster.node.stats.TransportNodesStatsAction;
import org.elasticsearch.action.admin.indices.stats.IndicesStatsRequest;
import org.elasticsearch.action.admin.indices.stats.IndicesStatsResponse;
import org.elasticsearch.action.admin.indices.stats.ShardStats;
import org.elasticsearch.action.admin.indices.stats.TransportIndicesStatsAction;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.routing.allocation.decider.DiskThresholdDecider;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.concurrent.EsRejectedExecutionException;
import org.elasticsearch.monitor.fs.FsInfo;
import org.elasticsearch.node.settings.NodeSettingsService;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.ReceiveTimeoutTransportException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* InternalClusterInfoService provides the ClusterInfoService interface,
* routinely updated on a timer. The timer can be dynamically changed by
* setting the cluster.info.update.interval setting (defaulting
* to 30 seconds). The InternalClusterInfoService only runs on the master node.
* Listens for changes in the number of data nodes and immediately submits a
* ClusterInfoUpdateJob if a node has been added.
*
* Every time the timer runs, gathers information about the disk usage and
* shard sizes across the cluster.
*/
public class InternalClusterInfoService extends AbstractComponent implements ClusterInfoService, LocalNodeMasterListener, ClusterStateListener {
public static final String INTERNAL_CLUSTER_INFO_UPDATE_INTERVAL = "cluster.info.update.interval";
public static final String INTERNAL_CLUSTER_INFO_TIMEOUT = "cluster.info.update.timeout";
private volatile TimeValue updateFrequency;
private volatile Map leastAvailableSpaceUsages;
private volatile Map mostAvailableSpaceUsages;
private volatile Map shardRoutingToDataPath;
private volatile Map shardSizes;
private volatile boolean isMaster = false;
private volatile boolean enabled;
private volatile TimeValue fetchTimeout;
private final TransportNodesStatsAction transportNodesStatsAction;
private final TransportIndicesStatsAction transportIndicesStatsAction;
private final ClusterService clusterService;
private final ThreadPool threadPool;
private final List listeners = new CopyOnWriteArrayList<>();
@Inject
public InternalClusterInfoService(Settings settings, NodeSettingsService nodeSettingsService,
TransportNodesStatsAction transportNodesStatsAction,
TransportIndicesStatsAction transportIndicesStatsAction, ClusterService clusterService,
ThreadPool threadPool) {
super(settings);
this.leastAvailableSpaceUsages = Collections.emptyMap();
this.mostAvailableSpaceUsages = Collections.emptyMap();
this.shardRoutingToDataPath = Collections.emptyMap();
this.shardSizes = Collections.emptyMap();
this.transportNodesStatsAction = transportNodesStatsAction;
this.transportIndicesStatsAction = transportIndicesStatsAction;
this.clusterService = clusterService;
this.threadPool = threadPool;
this.updateFrequency = settings.getAsTime(INTERNAL_CLUSTER_INFO_UPDATE_INTERVAL, TimeValue.timeValueSeconds(30));
this.fetchTimeout = settings.getAsTime(INTERNAL_CLUSTER_INFO_TIMEOUT, TimeValue.timeValueSeconds(15));
this.enabled = settings.getAsBoolean(DiskThresholdDecider.CLUSTER_ROUTING_ALLOCATION_DISK_THRESHOLD_ENABLED, true);
nodeSettingsService.addListener(new ApplySettings());
// Add InternalClusterInfoService to listen for Master changes
this.clusterService.add((LocalNodeMasterListener)this);
// Add to listen for state changes (when nodes are added)
this.clusterService.add((ClusterStateListener)this);
}
class ApplySettings implements NodeSettingsService.Listener {
@Override
public void onRefreshSettings(Settings settings) {
TimeValue newUpdateFrequency = settings.getAsTime(INTERNAL_CLUSTER_INFO_UPDATE_INTERVAL, null);
// ClusterInfoService is only enabled if the DiskThresholdDecider is enabled
Boolean newEnabled = settings.getAsBoolean(DiskThresholdDecider.CLUSTER_ROUTING_ALLOCATION_DISK_THRESHOLD_ENABLED, null);
if (newUpdateFrequency != null) {
if (newUpdateFrequency.getMillis() < TimeValue.timeValueSeconds(10).getMillis()) {
logger.warn("[{}] set too low [{}] (< 10s)", INTERNAL_CLUSTER_INFO_UPDATE_INTERVAL, newUpdateFrequency);
throw new IllegalStateException("Unable to set " + INTERNAL_CLUSTER_INFO_UPDATE_INTERVAL + " less than 10 seconds");
} else {
logger.info("updating [{}] from [{}] to [{}]", INTERNAL_CLUSTER_INFO_UPDATE_INTERVAL, updateFrequency, newUpdateFrequency);
InternalClusterInfoService.this.updateFrequency = newUpdateFrequency;
}
}
TimeValue newFetchTimeout = settings.getAsTime(INTERNAL_CLUSTER_INFO_TIMEOUT, null);
if (newFetchTimeout != null) {
logger.info("updating fetch timeout [{}] from [{}] to [{}]", INTERNAL_CLUSTER_INFO_TIMEOUT, fetchTimeout, newFetchTimeout);
InternalClusterInfoService.this.fetchTimeout = newFetchTimeout;
}
// We don't log about enabling it here, because the DiskThresholdDecider will already be logging about enable/disable
if (newEnabled != null) {
InternalClusterInfoService.this.enabled = newEnabled;
}
}
}
@Override
public void onMaster() {
this.isMaster = true;
if (logger.isTraceEnabled()) {
logger.trace("I have been elected master, scheduling a ClusterInfoUpdateJob");
}
try {
// Submit a job that will start after DEFAULT_STARTING_INTERVAL, and reschedule itself after running
threadPool.schedule(updateFrequency, executorName(), new SubmitReschedulingClusterInfoUpdatedJob());
if (clusterService.state().getNodes().getDataNodes().size() > 1) {
// Submit an info update job to be run immediately
threadPool.executor(executorName()).execute(new Runnable() {
@Override
public void run() {
maybeRefresh();
}
});
}
} catch (EsRejectedExecutionException ex) {
if (logger.isDebugEnabled()) {
logger.debug("Couldn't schedule cluster info update task - node might be shutting down", ex);
}
}
}
@Override
public void offMaster() {
this.isMaster = false;
}
@Override
public String executorName() {
return ThreadPool.Names.MANAGEMENT;
}
@Override
public void clusterChanged(ClusterChangedEvent event) {
if (!this.enabled) {
return;
}
// Check whether it was a data node that was added
boolean dataNodeAdded = false;
for (DiscoveryNode addedNode : event.nodesDelta().addedNodes()) {
if (addedNode.dataNode()) {
dataNodeAdded = true;
break;
}
}
if (this.isMaster && dataNodeAdded && clusterService.state().getNodes().getDataNodes().size() > 1) {
if (logger.isDebugEnabled()) {
logger.debug("data node was added, retrieving new cluster info");
}
threadPool.executor(executorName()).execute(new Runnable() {
@Override
public void run() {
maybeRefresh();
}
});
}
if (this.isMaster && event.nodesRemoved()) {
for (DiscoveryNode removedNode : event.nodesDelta().removedNodes()) {
if (removedNode.dataNode()) {
if (logger.isTraceEnabled()) {
logger.trace("Removing node from cluster info: {}", removedNode.getId());
}
if (leastAvailableSpaceUsages.containsKey(removedNode.getId())) {
Map newMaxUsages = new HashMap<>(leastAvailableSpaceUsages);
newMaxUsages.remove(removedNode.getId());
leastAvailableSpaceUsages = Collections.unmodifiableMap(newMaxUsages);
}
if (mostAvailableSpaceUsages.containsKey(removedNode.getId())) {
Map newMinUsages = new HashMap<>(mostAvailableSpaceUsages);
newMinUsages.remove(removedNode.getId());
mostAvailableSpaceUsages = Collections.unmodifiableMap(newMinUsages);
}
}
}
}
}
@Override
public ClusterInfo getClusterInfo() {
return new ClusterInfo(leastAvailableSpaceUsages, mostAvailableSpaceUsages, shardSizes, shardRoutingToDataPath);
}
@Override
public void addListener(Listener listener) {
this.listeners.add(listener);
}
/**
* Class used to submit {@link #maybeRefresh()} on the
* {@link InternalClusterInfoService} threadpool, these jobs will
* reschedule themselves by placing a new instance of this class onto the
* scheduled threadpool.
*/
public class SubmitReschedulingClusterInfoUpdatedJob implements Runnable {
@Override
public void run() {
if (logger.isTraceEnabled()) {
logger.trace("Submitting new rescheduling cluster info update job");
}
try {
threadPool.executor(executorName()).execute(new Runnable() {
@Override
public void run() {
try {
maybeRefresh();
} finally { //schedule again after we refreshed
if (isMaster) {
if (logger.isTraceEnabled()) {
logger.trace("Scheduling next run for updating cluster info in: {}", updateFrequency.toString());
}
try {
threadPool.schedule(updateFrequency, executorName(), this);
} catch (EsRejectedExecutionException ex) {
logger.debug("Reschedule cluster info service was rejected", ex);
}
}
}
}
});
} catch (EsRejectedExecutionException ex) {
if (logger.isDebugEnabled()) {
logger.debug("Couldn't re-schedule cluster info update task - node might be shutting down", ex);
}
}
}
}
/**
* Retrieve the latest nodes stats, calling the listener when complete
* @return a latch that can be used to wait for the nodes stats to complete if desired
*/
protected CountDownLatch updateNodeStats(final ActionListener listener) {
final CountDownLatch latch = new CountDownLatch(1);
final NodesStatsRequest nodesStatsRequest = new NodesStatsRequest("data:true");
nodesStatsRequest.clear();
nodesStatsRequest.fs(true);
nodesStatsRequest.timeout(fetchTimeout);
transportNodesStatsAction.execute(nodesStatsRequest, new LatchedActionListener<>(listener, latch));
return latch;
}
/**
* Retrieve the latest indices stats, calling the listener when complete
* @return a latch that can be used to wait for the indices stats to complete if desired
*/
protected CountDownLatch updateIndicesStats(final ActionListener listener) {
final CountDownLatch latch = new CountDownLatch(1);
final IndicesStatsRequest indicesStatsRequest = new IndicesStatsRequest();
indicesStatsRequest.clear();
indicesStatsRequest.store(true);
transportIndicesStatsAction.execute(indicesStatsRequest, new LatchedActionListener<>(listener, latch));
return latch;
}
private final void maybeRefresh() {
// Short-circuit if not enabled
if (enabled) {
refresh();
} else {
if (logger.isTraceEnabled()) {
logger.trace("Skipping ClusterInfoUpdatedJob since it is disabled");
}
}
}
/**
* Refreshes the ClusterInfo in a blocking fashion
*/
public final ClusterInfo refresh() {
if (logger.isTraceEnabled()) {
logger.trace("Performing ClusterInfoUpdateJob");
}
final CountDownLatch nodeLatch = updateNodeStats(new ActionListener() {
@Override
public void onResponse(NodesStatsResponse nodeStatses) {
Map newLeastAvaiableUsages = new HashMap<>();
Map newMostAvaiableUsages = new HashMap<>();
fillDiskUsagePerNode(logger, nodeStatses.getNodes(), newLeastAvaiableUsages, newMostAvaiableUsages);
leastAvailableSpaceUsages = Collections.unmodifiableMap(newLeastAvaiableUsages);
mostAvailableSpaceUsages = Collections.unmodifiableMap(newMostAvaiableUsages);
}
@Override
public void onFailure(Throwable e) {
if (e instanceof ReceiveTimeoutTransportException) {
logger.error("NodeStatsAction timed out for ClusterInfoUpdateJob (reason [{}])", e.getMessage());
} else {
if (e instanceof ClusterBlockException) {
if (logger.isTraceEnabled()) {
logger.trace("Failed to execute NodeStatsAction for ClusterInfoUpdateJob", e);
}
} else {
logger.warn("Failed to execute NodeStatsAction for ClusterInfoUpdateJob", e);
}
// we empty the usages list, to be safe - we don't know what's going on.
leastAvailableSpaceUsages = Collections.emptyMap();
mostAvailableSpaceUsages = Collections.emptyMap();
}
}
});
final CountDownLatch indicesLatch = updateIndicesStats(new ActionListener() {
@Override
public void onResponse(IndicesStatsResponse indicesStatsResponse) {
ShardStats[] stats = indicesStatsResponse.getShards();
final HashMap newShardSizes = new HashMap<>();
final HashMap newShardRoutingToDataPath = new HashMap<>();
buildShardLevelInfo(logger, stats, newShardSizes, newShardRoutingToDataPath, clusterService.state());
shardSizes = Collections.unmodifiableMap(newShardSizes);
shardRoutingToDataPath = Collections.unmodifiableMap(newShardRoutingToDataPath);
}
@Override
public void onFailure(Throwable e) {
if (e instanceof ReceiveTimeoutTransportException) {
logger.error("IndicesStatsAction timed out for ClusterInfoUpdateJob (reason [{}])", e.getMessage());
} else {
if (e instanceof ClusterBlockException) {
if (logger.isTraceEnabled()) {
logger.trace("Failed to execute IndicesStatsAction for ClusterInfoUpdateJob", e);
}
} else {
logger.warn("Failed to execute IndicesStatsAction for ClusterInfoUpdateJob", e);
}
// we empty the usages list, to be safe - we don't know what's going on.
shardSizes = Collections.emptyMap();
shardRoutingToDataPath = Collections.emptyMap();
}
}
});
try {
nodeLatch.await(fetchTimeout.getMillis(), TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
Thread.currentThread().interrupt(); // restore interrupt status
logger.warn("Failed to update node information for ClusterInfoUpdateJob within {} timeout", fetchTimeout);
}
try {
indicesLatch.await(fetchTimeout.getMillis(), TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
Thread.currentThread().interrupt(); // restore interrupt status
logger.warn("Failed to update shard information for ClusterInfoUpdateJob within {} timeout", fetchTimeout);
}
ClusterInfo clusterInfo = getClusterInfo();
for (Listener l : listeners) {
try {
l.onNewInfo(clusterInfo);
} catch (Exception e) {
logger.info("Failed executing ClusterInfoService listener", e);
}
}
return clusterInfo;
}
static void buildShardLevelInfo(ESLogger logger, ShardStats[] stats, HashMap newShardSizes, HashMap newShardRoutingToDataPath, ClusterState state) {
MetaData meta = state.getMetaData();
for (ShardStats s : stats) {
IndexMetaData indexMeta = meta.index(s.getShardRouting().index());
Settings indexSettings = indexMeta == null ? null : indexMeta.getSettings();
newShardRoutingToDataPath.put(s.getShardRouting(), s.getDataPath());
long size = s.getStats().getStore().sizeInBytes();
String sid = ClusterInfo.shardIdentifierFromRouting(s.getShardRouting());
if (logger.isTraceEnabled()) {
logger.trace("shard: {} size: {}", sid, size);
}
if (indexSettings != null && IndexMetaData.isIndexUsingShadowReplicas(indexSettings)) {
// Shards on a shared filesystem should be considered of size 0
if (logger.isTraceEnabled()) {
logger.trace("shard: {} is using shadow replicas and will be treated as size 0", sid);
}
size = 0;
}
newShardSizes.put(sid, size);
}
}
static void fillDiskUsagePerNode(ESLogger logger, NodeStats[] nodeStatsArray, Map newLeastAvaiableUsages, Map newMostAvaiableUsages) {
for (NodeStats nodeStats : nodeStatsArray) {
if (nodeStats.getFs() == null) {
logger.warn("Unable to retrieve node FS stats for {}", nodeStats.getNode().name());
} else {
FsInfo.Path leastAvailablePath = null;
FsInfo.Path mostAvailablePath = null;
for (FsInfo.Path info : nodeStats.getFs()) {
if (leastAvailablePath == null) {
assert mostAvailablePath == null;
mostAvailablePath = leastAvailablePath = info;
} else if (leastAvailablePath.getAvailable().bytes() > info.getAvailable().bytes()){
leastAvailablePath = info;
} else if (mostAvailablePath.getAvailable().bytes() < info.getAvailable().bytes()) {
mostAvailablePath = info;
}
}
String nodeId = nodeStats.getNode().id();
String nodeName = nodeStats.getNode().getName();
if (logger.isTraceEnabled()) {
logger.trace("node: [{}], most available: total disk: {}, available disk: {} / least available: total disk: {}, available disk: {}",
nodeId, mostAvailablePath.getTotal(), leastAvailablePath.getAvailable(),
leastAvailablePath.getTotal(), leastAvailablePath.getAvailable());
}
if (leastAvailablePath.getTotal().bytes() < 0) {
if (logger.isTraceEnabled()) {
logger.trace("node: [{}] least available path has less than 0 total bytes of disk [{}], skipping",
nodeId, leastAvailablePath.getTotal().bytes());
}
} else {
newLeastAvaiableUsages.put(nodeId, new DiskUsage(nodeId, nodeName, leastAvailablePath.getPath(), leastAvailablePath.getTotal().bytes(), leastAvailablePath.getAvailable().bytes()));
}
if (mostAvailablePath.getTotal().bytes() < 0) {
if (logger.isTraceEnabled()) {
logger.trace("node: [{}] most available path has less than 0 total bytes of disk [{}], skipping",
nodeId, mostAvailablePath.getTotal().bytes());
}
} else {
newMostAvaiableUsages.put(nodeId, new DiskUsage(nodeId, nodeName, mostAvailablePath.getPath(), mostAvailablePath.getTotal().bytes(), mostAvailablePath.getAvailable().bytes()));
}
}
}
}
}