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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.cluster.health;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.apache.logging.log4j.util.Supplier;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.ActiveShardCount;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.action.support.master.TransportMasterNodeReadAction;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ClusterStateObserver;
import org.elasticsearch.cluster.ClusterStateUpdateTask;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.health.ClusterHealthStatus;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.routing.UnassignedInfo;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.gateway.GatewayAllocator;
import org.elasticsearch.index.IndexNotFoundException;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
/**
*
*/
public class TransportClusterHealthAction extends TransportMasterNodeReadAction {
private final GatewayAllocator gatewayAllocator;
@Inject
public TransportClusterHealthAction(Settings settings, TransportService transportService, ClusterService clusterService,
ThreadPool threadPool, ActionFilters actionFilters,
IndexNameExpressionResolver indexNameExpressionResolver, GatewayAllocator gatewayAllocator) {
super(settings, ClusterHealthAction.NAME, false, transportService, clusterService, threadPool, actionFilters,
indexNameExpressionResolver, ClusterHealthRequest::new);
this.gatewayAllocator = gatewayAllocator;
}
@Override
protected String executor() {
// this should be executing quickly no need to fork off
return ThreadPool.Names.SAME;
}
@Override
protected ClusterBlockException checkBlock(ClusterHealthRequest request, ClusterState state) {
return null; // we want users to be able to call this even when there are global blocks, just to check the health (are there blocks?)
}
@Override
protected ClusterHealthResponse newResponse() {
return new ClusterHealthResponse();
}
@Override
protected final void masterOperation(ClusterHealthRequest request, ClusterState state, ActionListener listener) throws Exception {
logger.warn("attempt to execute a cluster health operation without a task");
throw new UnsupportedOperationException("task parameter is required for this operation");
}
@Override
protected void masterOperation(Task task, final ClusterHealthRequest request, final ClusterState unusedState, final ActionListener listener) {
if (request.waitForEvents() != null) {
final long endTimeMS = TimeValue.nsecToMSec(System.nanoTime()) + request.timeout().millis();
clusterService.submitStateUpdateTask("cluster_health (wait_for_events [" + request.waitForEvents() + "])", new ClusterStateUpdateTask(request.waitForEvents()) {
@Override
public ClusterState execute(ClusterState currentState) {
return currentState;
}
@Override
public void clusterStateProcessed(String source, ClusterState oldState, ClusterState newState) {
final long timeoutInMillis = Math.max(0, endTimeMS - TimeValue.nsecToMSec(System.nanoTime()));
final TimeValue newTimeout = TimeValue.timeValueMillis(timeoutInMillis);
request.timeout(newTimeout);
executeHealth(request, listener);
}
@Override
public void onNoLongerMaster(String source) {
logger.trace("stopped being master while waiting for events with priority [{}]. retrying.", request.waitForEvents());
doExecute(task, request, listener);
}
@Override
public void onFailure(String source, Exception e) {
logger.error((Supplier) () -> new ParameterizedMessage("unexpected failure during [{}]", source), e);
listener.onFailure(e);
}
@Override
public boolean runOnlyOnMaster() {
return !request.local();
}
});
} else {
executeHealth(request, listener);
}
}
private void executeHealth(final ClusterHealthRequest request, final ActionListener listener) {
int waitFor = 5;
if (request.waitForStatus() == null) {
waitFor--;
}
if (request.waitForNoRelocatingShards() == false) {
waitFor--;
}
if (request.waitForActiveShards().equals(ActiveShardCount.NONE)) {
waitFor--;
}
if (request.waitForNodes().isEmpty()) {
waitFor--;
}
if (request.indices() == null || request.indices().length == 0) { // check that they actually exists in the meta data
waitFor--;
}
assert waitFor >= 0;
final ClusterStateObserver observer = new ClusterStateObserver(clusterService, logger, threadPool.getThreadContext());
final ClusterState state = observer.observedState();
if (request.timeout().millis() == 0) {
listener.onResponse(getResponse(request, state, waitFor, request.timeout().millis() == 0));
return;
}
final int concreteWaitFor = waitFor;
final ClusterStateObserver.ChangePredicate validationPredicate = new ClusterStateObserver.ValidationPredicate() {
@Override
protected boolean validate(ClusterState newState) {
return newState.status() == ClusterState.ClusterStateStatus.APPLIED && validateRequest(request, newState, concreteWaitFor);
}
};
final ClusterStateObserver.Listener stateListener = new ClusterStateObserver.Listener() {
@Override
public void onNewClusterState(ClusterState clusterState) {
listener.onResponse(getResponse(request, clusterState, concreteWaitFor, false));
}
@Override
public void onClusterServiceClose() {
listener.onFailure(new IllegalStateException("ClusterService was close during health call"));
}
@Override
public void onTimeout(TimeValue timeout) {
final ClusterState clusterState = clusterService.state();
final ClusterHealthResponse response = getResponse(request, clusterState, concreteWaitFor, true);
listener.onResponse(response);
}
};
if (state.status() == ClusterState.ClusterStateStatus.APPLIED && validateRequest(request, state, concreteWaitFor)) {
stateListener.onNewClusterState(state);
} else {
observer.waitForNextChange(stateListener, validationPredicate, request.timeout());
}
}
private boolean validateRequest(final ClusterHealthRequest request, ClusterState clusterState, final int waitFor) {
ClusterHealthResponse response = clusterHealth(request, clusterState, clusterService.numberOfPendingTasks(),
gatewayAllocator.getNumberOfInFlightFetch(), clusterService.getMaxTaskWaitTime());
return prepareResponse(request, response, clusterState, waitFor);
}
private ClusterHealthResponse getResponse(final ClusterHealthRequest request, ClusterState clusterState, final int waitFor, boolean timedOut) {
ClusterHealthResponse response = clusterHealth(request, clusterState, clusterService.numberOfPendingTasks(),
gatewayAllocator.getNumberOfInFlightFetch(), clusterService.getMaxTaskWaitTime());
boolean valid = prepareResponse(request, response, clusterState, waitFor);
assert valid || timedOut;
// we check for a timeout here since this method might be called from the wait_for_events
// response handler which might have timed out already.
// if the state is sufficient for what we where waiting for we don't need to mark this as timedOut.
// We spend too much time in waiting for events such that we might already reached a valid state.
// this should not mark the request as timed out
response.setTimedOut(timedOut && valid == false);
return response;
}
private boolean prepareResponse(final ClusterHealthRequest request, final ClusterHealthResponse response, ClusterState clusterState, final int waitFor) {
int waitForCounter = 0;
if (request.waitForStatus() != null && response.getStatus().value() <= request.waitForStatus().value()) {
waitForCounter++;
}
if (request.waitForNoRelocatingShards() && response.getRelocatingShards() == 0) {
waitForCounter++;
}
if (request.waitForActiveShards().equals(ActiveShardCount.NONE) == false) {
ActiveShardCount waitForActiveShards = request.waitForActiveShards();
assert waitForActiveShards.equals(ActiveShardCount.DEFAULT) == false :
"waitForActiveShards must not be DEFAULT on the request object, instead it should be NONE";
if (waitForActiveShards.equals(ActiveShardCount.ALL)
&& response.getUnassignedShards() == 0
&& response.getInitializingShards() == 0) {
// if we are waiting for all shards to be active, then the num of unassigned and num of initializing shards must be 0
waitForCounter++;
} else if (waitForActiveShards.enoughShardsActive(response.getActiveShards())) {
// there are enough active shards to meet the requirements of the request
waitForCounter++;
}
}
if (request.indices() != null && request.indices().length > 0) {
try {
indexNameExpressionResolver.concreteIndexNames(clusterState, IndicesOptions.strictExpand(), request.indices());
waitForCounter++;
} catch (IndexNotFoundException e) {
response.setStatus(ClusterHealthStatus.RED); // no indices, make sure its RED
// missing indices, wait a bit more...
}
}
if (!request.waitForNodes().isEmpty()) {
if (request.waitForNodes().startsWith(">=")) {
int expected = Integer.parseInt(request.waitForNodes().substring(2));
if (response.getNumberOfNodes() >= expected) {
waitForCounter++;
}
} else if (request.waitForNodes().startsWith("ge(")) {
int expected = Integer.parseInt(request.waitForNodes().substring(3, request.waitForNodes().length() - 1));
if (response.getNumberOfNodes() >= expected) {
waitForCounter++;
}
} else if (request.waitForNodes().startsWith("<=")) {
int expected = Integer.parseInt(request.waitForNodes().substring(2));
if (response.getNumberOfNodes() <= expected) {
waitForCounter++;
}
} else if (request.waitForNodes().startsWith("le(")) {
int expected = Integer.parseInt(request.waitForNodes().substring(3, request.waitForNodes().length() - 1));
if (response.getNumberOfNodes() <= expected) {
waitForCounter++;
}
} else if (request.waitForNodes().startsWith(">")) {
int expected = Integer.parseInt(request.waitForNodes().substring(1));
if (response.getNumberOfNodes() > expected) {
waitForCounter++;
}
} else if (request.waitForNodes().startsWith("gt(")) {
int expected = Integer.parseInt(request.waitForNodes().substring(3, request.waitForNodes().length() - 1));
if (response.getNumberOfNodes() > expected) {
waitForCounter++;
}
} else if (request.waitForNodes().startsWith("<")) {
int expected = Integer.parseInt(request.waitForNodes().substring(1));
if (response.getNumberOfNodes() < expected) {
waitForCounter++;
}
} else if (request.waitForNodes().startsWith("lt(")) {
int expected = Integer.parseInt(request.waitForNodes().substring(3, request.waitForNodes().length() - 1));
if (response.getNumberOfNodes() < expected) {
waitForCounter++;
}
} else {
int expected = Integer.parseInt(request.waitForNodes());
if (response.getNumberOfNodes() == expected) {
waitForCounter++;
}
}
}
return waitForCounter == waitFor;
}
private ClusterHealthResponse clusterHealth(ClusterHealthRequest request, ClusterState clusterState, int numberOfPendingTasks, int numberOfInFlightFetch,
TimeValue pendingTaskTimeInQueue) {
if (logger.isTraceEnabled()) {
logger.trace("Calculating health based on state version [{}]", clusterState.version());
}
String[] concreteIndices;
try {
concreteIndices = indexNameExpressionResolver.concreteIndexNames(clusterState, request);
} catch (IndexNotFoundException e) {
// one of the specified indices is not there - treat it as RED.
ClusterHealthResponse response = new ClusterHealthResponse(clusterState.getClusterName().value(), Strings.EMPTY_ARRAY, clusterState,
numberOfPendingTasks, numberOfInFlightFetch, UnassignedInfo.getNumberOfDelayedUnassigned(clusterState),
pendingTaskTimeInQueue);
response.setStatus(ClusterHealthStatus.RED);
return response;
}
return new ClusterHealthResponse(clusterState.getClusterName().value(), concreteIndices, clusterState, numberOfPendingTasks,
numberOfInFlightFetch, UnassignedInfo.getNumberOfDelayedUnassigned(clusterState), pendingTaskTimeInQueue);
}
}
