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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.gateway;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ClusterStateListener;
import org.elasticsearch.cluster.ClusterStateUpdateTask;
import org.elasticsearch.cluster.block.ClusterBlock;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.coordination.Coordinator;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.allocation.AllocationService;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.component.AbstractLifecycleComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.concurrent.AbstractRunnable;
import org.elasticsearch.core.TimeValue;
import org.elasticsearch.discovery.Discovery;
import org.elasticsearch.discovery.zen.ZenDiscovery;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.threadpool.ThreadPool;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Function;
public class GatewayService extends AbstractLifecycleComponent implements ClusterStateListener {
private static final Logger logger = LogManager.getLogger(GatewayService.class);
public static final Setting EXPECTED_NODES_SETTING = Setting.intSetting(
"gateway.expected_nodes",
-1,
-1,
Property.NodeScope,
Property.Deprecated
);
public static final Setting EXPECTED_DATA_NODES_SETTING = Setting.intSetting(
"gateway.expected_data_nodes",
-1,
-1,
Property.NodeScope
);
public static final Setting EXPECTED_MASTER_NODES_SETTING = Setting.intSetting(
"gateway.expected_master_nodes",
-1,
-1,
Property.NodeScope,
Property.Deprecated
);
public static final Setting RECOVER_AFTER_TIME_SETTING = Setting.positiveTimeSetting(
"gateway.recover_after_time",
TimeValue.timeValueMillis(0),
Property.NodeScope
);
public static final Setting RECOVER_AFTER_NODES_SETTING = Setting.intSetting(
"gateway.recover_after_nodes",
-1,
-1,
Property.NodeScope,
Property.Deprecated
);
public static final Setting RECOVER_AFTER_DATA_NODES_SETTING = Setting.intSetting(
"gateway.recover_after_data_nodes",
-1,
-1,
Property.NodeScope
);
public static final Setting RECOVER_AFTER_MASTER_NODES_SETTING = Setting.intSetting(
"gateway.recover_after_master_nodes",
0,
0,
Property.NodeScope,
Property.Deprecated
);
public static final ClusterBlock STATE_NOT_RECOVERED_BLOCK = new ClusterBlock(
1,
"state not recovered / initialized",
true,
true,
false,
RestStatus.SERVICE_UNAVAILABLE,
ClusterBlockLevel.ALL
);
static final TimeValue DEFAULT_RECOVER_AFTER_TIME_IF_EXPECTED_NODES_IS_SET = TimeValue.timeValueMinutes(5);
private final ThreadPool threadPool;
private final AllocationService allocationService;
private final ClusterService clusterService;
private final TimeValue recoverAfterTime;
private final int recoverAfterNodes;
private final int expectedNodes;
private final int recoverAfterDataNodes;
private final int expectedDataNodes;
private final int recoverAfterMasterNodes;
private final int expectedMasterNodes;
private final Runnable recoveryRunnable;
private final AtomicBoolean recoveryInProgress = new AtomicBoolean();
private final AtomicBoolean scheduledRecovery = new AtomicBoolean();
@Inject
public GatewayService(
final Settings settings,
final AllocationService allocationService,
final ClusterService clusterService,
final ThreadPool threadPool,
final TransportNodesListGatewayMetaState listGatewayMetaState,
final Discovery discovery
) {
this.allocationService = allocationService;
this.clusterService = clusterService;
this.threadPool = threadPool;
// allow to control a delay of when indices will get created
this.expectedNodes = EXPECTED_NODES_SETTING.get(settings);
this.expectedDataNodes = EXPECTED_DATA_NODES_SETTING.get(settings);
this.expectedMasterNodes = EXPECTED_MASTER_NODES_SETTING.get(settings);
if (RECOVER_AFTER_TIME_SETTING.exists(settings)) {
recoverAfterTime = RECOVER_AFTER_TIME_SETTING.get(settings);
} else if (expectedNodes >= 0 || expectedDataNodes >= 0 || expectedMasterNodes >= 0) {
recoverAfterTime = DEFAULT_RECOVER_AFTER_TIME_IF_EXPECTED_NODES_IS_SET;
} else {
recoverAfterTime = null;
}
this.recoverAfterNodes = RECOVER_AFTER_NODES_SETTING.get(settings);
this.recoverAfterDataNodes = RECOVER_AFTER_DATA_NODES_SETTING.get(settings);
// default the recover after master nodes to the minimum master nodes in the discovery
if (RECOVER_AFTER_MASTER_NODES_SETTING.exists(settings)) {
recoverAfterMasterNodes = RECOVER_AFTER_MASTER_NODES_SETTING.get(settings);
} else if (discovery instanceof ZenDiscovery) {
recoverAfterMasterNodes = settings.getAsInt("discovery.zen.minimum_master_nodes", -1);
} else {
recoverAfterMasterNodes = -1;
}
if (discovery instanceof Coordinator) {
recoveryRunnable = () -> clusterService.submitStateUpdateTask("local-gateway-elected-state", new RecoverStateUpdateTask());
} else {
final Gateway gateway = new Gateway(settings, clusterService, listGatewayMetaState);
recoveryRunnable = () -> gateway.performStateRecovery(new GatewayRecoveryListener());
}
}
@Override
protected void doStart() {
if (DiscoveryNode.isMasterNode(clusterService.getSettings())) {
// use post applied so that the state will be visible to the background recovery thread we spawn in performStateRecovery
clusterService.addListener(this);
}
}
@Override
protected void doStop() {
clusterService.removeListener(this);
}
@Override
protected void doClose() {}
@Override
public void clusterChanged(final ClusterChangedEvent event) {
if (lifecycle.stoppedOrClosed()) {
return;
}
final ClusterState state = event.state();
if (state.nodes().isLocalNodeElectedMaster() == false) {
// not our job to recover
return;
}
if (state.blocks().hasGlobalBlock(STATE_NOT_RECOVERED_BLOCK) == false) {
// already recovered
return;
}
final DiscoveryNodes nodes = state.nodes();
if (state.nodes().getMasterNodeId() == null) {
logger.debug("not recovering from gateway, no master elected yet");
} else if (recoverAfterNodes != -1 && (nodes.getMasterAndDataNodes().size()) < recoverAfterNodes) {
logger.debug(
"not recovering from gateway, nodes_size (data+master) [{}] < recover_after_nodes [{}]",
nodes.getMasterAndDataNodes().size(),
recoverAfterNodes
);
} else if (recoverAfterDataNodes != -1 && nodes.getDataNodes().size() < recoverAfterDataNodes) {
logger.debug(
"not recovering from gateway, nodes_size (data) [{}] < recover_after_data_nodes [{}]",
nodes.getDataNodes().size(),
recoverAfterDataNodes
);
} else if (recoverAfterMasterNodes != -1 && nodes.getMasterNodes().size() < recoverAfterMasterNodes) {
logger.debug(
"not recovering from gateway, nodes_size (master) [{}] < recover_after_master_nodes [{}]",
nodes.getMasterNodes().size(),
recoverAfterMasterNodes
);
} else {
boolean enforceRecoverAfterTime;
String reason;
if (expectedNodes == -1 && expectedMasterNodes == -1 && expectedDataNodes == -1) {
// no expected is set, honor the setting if they are there
enforceRecoverAfterTime = true;
reason = "recover_after_time was set to [" + recoverAfterTime + "]";
} else {
// one of the expected is set, see if all of them meet the need, and ignore the timeout in this case
enforceRecoverAfterTime = false;
reason = "";
if (expectedNodes != -1 && (nodes.getMasterAndDataNodes().size() < expectedNodes)) { // does not meet the expected...
enforceRecoverAfterTime = true;
reason = "expecting [" + expectedNodes + "] nodes, but only have [" + nodes.getMasterAndDataNodes().size() + "]";
} else if (expectedDataNodes != -1 && (nodes.getDataNodes().size() < expectedDataNodes)) { // does not meet the expected...
enforceRecoverAfterTime = true;
reason = "expecting [" + expectedDataNodes + "] data nodes, but only have [" + nodes.getDataNodes().size() + "]";
} else if (expectedMasterNodes != -1 && (nodes.getMasterNodes().size() < expectedMasterNodes)) {
// does not meet the expected...
enforceRecoverAfterTime = true;
reason = "expecting [" + expectedMasterNodes + "] master nodes, but only have [" + nodes.getMasterNodes().size() + "]";
}
}
performStateRecovery(enforceRecoverAfterTime, reason);
}
}
private void performStateRecovery(final boolean enforceRecoverAfterTime, final String reason) {
if (enforceRecoverAfterTime && recoverAfterTime != null) {
if (scheduledRecovery.compareAndSet(false, true)) {
logger.info("delaying initial state recovery for [{}]. {}", recoverAfterTime, reason);
threadPool.schedule(new AbstractRunnable() {
@Override
public void onFailure(Exception e) {
logger.warn("delayed state recovery failed", e);
resetRecoveredFlags();
}
@Override
protected void doRun() {
if (recoveryInProgress.compareAndSet(false, true)) {
logger.info("recover_after_time [{}] elapsed. performing state recovery...", recoverAfterTime);
recoveryRunnable.run();
}
}
}, recoverAfterTime, ThreadPool.Names.GENERIC);
}
} else {
if (recoveryInProgress.compareAndSet(false, true)) {
threadPool.generic().execute(new AbstractRunnable() {
@Override
public void onFailure(final Exception e) {
logger.warn("state recovery failed", e);
resetRecoveredFlags();
}
@Override
protected void doRun() {
logger.debug("performing state recovery...");
recoveryRunnable.run();
}
});
}
}
}
private void resetRecoveredFlags() {
recoveryInProgress.set(false);
scheduledRecovery.set(false);
}
class RecoverStateUpdateTask extends ClusterStateUpdateTask {
@Override
public ClusterState execute(final ClusterState currentState) {
if (currentState.blocks().hasGlobalBlock(STATE_NOT_RECOVERED_BLOCK) == false) {
logger.debug("cluster is already recovered");
return currentState;
}
final ClusterState newState = Function.identity()
.andThen(ClusterStateUpdaters::updateRoutingTable)
.andThen(ClusterStateUpdaters::removeStateNotRecoveredBlock)
.apply(currentState);
return allocationService.reroute(newState, "state recovered");
}
@Override
public void clusterStateProcessed(final String source, final ClusterState oldState, final ClusterState newState) {
logger.info("recovered [{}] indices into cluster_state", newState.metadata().indices().size());
// reset flag even though state recovery completed, to ensure that if we subsequently become leader again based on a
// not-recovered state, that we again do another state recovery.
resetRecoveredFlags();
}
@Override
public void onNoLongerMaster(String source) {
logger.debug("stepped down as master before recovering state [{}]", source);
resetRecoveredFlags();
}
@Override
public void onFailure(final String source, final Exception e) {
logger.info(() -> new ParameterizedMessage("unexpected failure during [{}]", source), e);
resetRecoveredFlags();
}
}
class GatewayRecoveryListener implements Gateway.GatewayStateRecoveredListener {
@Override
public void onSuccess(final ClusterState recoveredState) {
logger.trace("successful state recovery, importing cluster state...");
clusterService.submitStateUpdateTask("local-gateway-elected-state", new RecoverStateUpdateTask() {
@Override
public ClusterState execute(final ClusterState currentState) {
final ClusterState updatedState = ClusterStateUpdaters.mixCurrentStateAndRecoveredState(currentState, recoveredState);
return super.execute(ClusterStateUpdaters.recoverClusterBlocks(updatedState));
}
});
}
@Override
public void onFailure(final String msg) {
logger.info("state recovery failed: {}", msg);
resetRecoveredFlags();
}
}
// used for testing
TimeValue recoverAfterTime() {
return recoverAfterTime;
}
}
