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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.nodeadmin;
import com.yahoo.config.provision.HostName;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.hosted.node.admin.configserver.noderepository.NodeSpec;
import com.yahoo.vespa.hosted.node.admin.configserver.noderepository.NodeRepository;
import com.yahoo.vespa.hosted.node.admin.configserver.orchestrator.Orchestrator;
import com.yahoo.vespa.hosted.provision.Node;
import java.time.Duration;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import static com.yahoo.vespa.hosted.node.admin.nodeadmin.NodeAdminStateUpdater.State.RESUMED;
import static com.yahoo.vespa.hosted.node.admin.nodeadmin.NodeAdminStateUpdater.State.SUSPENDED_NODE_ADMIN;
import static com.yahoo.vespa.hosted.node.admin.nodeadmin.NodeAdminStateUpdater.State.TRANSITIONING;
/**
* Pulls information from node repository and forwards containers to run to node admin.
*
* @author dybis, stiankri
*/
public class NodeAdminStateUpdater {
private static final Logger log = Logger.getLogger(NodeAdminStateUpdater.class.getName());
private static final Duration FREEZE_CONVERGENCE_TIMEOUT = Duration.ofMinutes(5);
private final NodeRepository nodeRepository;
private final Orchestrator orchestrator;
private final NodeAdmin nodeAdmin;
private final String hostHostname;
public enum State { TRANSITIONING, RESUMED, SUSPENDED_NODE_ADMIN, SUSPENDED }
private State currentState = SUSPENDED_NODE_ADMIN;
public NodeAdminStateUpdater(
NodeRepository nodeRepository,
Orchestrator orchestrator,
NodeAdmin nodeAdmin,
HostName hostHostname) {
this.nodeRepository = nodeRepository;
this.orchestrator = orchestrator;
this.nodeAdmin = nodeAdmin;
this.hostHostname = hostHostname.value();
}
public void start() {
nodeAdmin.start();
}
public void converge(State wantedState) {
try {
convergeState(wantedState);
} finally {
if (wantedState != RESUMED && currentState == TRANSITIONING) {
Duration subsystemFreezeDuration = nodeAdmin.subsystemFreezeDuration();
if (subsystemFreezeDuration.compareTo(FREEZE_CONVERGENCE_TIMEOUT) > 0) {
// We have spent too much time trying to freeze and node admin is still not frozen.
// To avoid node agents stalling for too long, we'll force unfrozen ticks now.
log.info("Timed out trying to freeze, will force unfreezed ticks");
fetchContainersToRunFromNodeRepository();
nodeAdmin.setFrozen(false);
}
} else if (currentState == RESUMED) {
fetchContainersToRunFromNodeRepository();
}
}
}
/**
* This method attempts to converge node-admin w/agents to a {@link State}
* with respect to: freeze, Orchestrator, and services running.
*/
private void convergeState(State wantedState) {
if (currentState == wantedState) return;
currentState = TRANSITIONING;
boolean wantFrozen = wantedState != RESUMED;
if (!nodeAdmin.setFrozen(wantFrozen)) {
throw new ConvergenceException("NodeAdmin is not yet " + (wantFrozen ? "frozen" : "unfrozen"));
}
boolean hostIsActiveInNR = nodeRepository.getNode(hostHostname).getState() == Node.State.active;
switch (wantedState) {
case RESUMED:
if (hostIsActiveInNR) orchestrator.resume(hostHostname);
break;
case SUSPENDED_NODE_ADMIN:
if (hostIsActiveInNR) orchestrator.suspend(hostHostname);
break;
case SUSPENDED:
// Fetch active nodes from node repo before suspending nodes.
// It is only possible to suspend active nodes,
// the orchestrator will fail if trying to suspend nodes in other states.
// Even though state is frozen we need to interact with node repo, but
// the data from node repo should not be used for anything else.
// We should also suspend host's hostname to suspend node-admin
List<String> nodesInActiveState = getNodesInActiveState();
List<String> nodesToSuspend = new ArrayList<>(nodesInActiveState);
if (hostIsActiveInNR) nodesToSuspend.add(hostHostname);
if (!nodesToSuspend.isEmpty()) {
orchestrator.suspend(hostHostname, nodesToSuspend);
log.info("Orchestrator allows suspension of " + nodesToSuspend);
}
// The node agent services are stopped by this thread, which is OK only
// because the node agents are frozen (see above).
nodeAdmin.stopNodeAgentServices(nodesInActiveState);
break;
default:
throw new IllegalStateException("Unknown wanted state " + wantedState);
}
log.info("State changed from " + currentState + " to " + wantedState);
currentState = wantedState;
}
private void fetchContainersToRunFromNodeRepository() {
try {
final List<NodeSpec> containersToRun = nodeRepository.getNodes(hostHostname);
nodeAdmin.refreshContainersToRun(containersToRun);
} catch (Exception e) {
log.log(LogLevel.WARNING, "Failed to update which containers should be running", e);
}
}
private List<String> getNodesInActiveState() {
return nodeRepository.getNodes(hostHostname)
.stream()
.filter(node -> node.getState() == Node.State.active)
.map(NodeSpec::getHostname)
.collect(Collectors.toList());
}
}
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