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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.clustercontroller.core;
import com.yahoo.log.LogLevel;
import com.yahoo.vdslib.state.*;
import com.yahoo.vespa.clustercontroller.core.database.DatabaseHandler;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.logging.Logger;
import java.util.stream.Collectors;
public class SystemStateBroadcaster {
public static Logger log = Logger.getLogger(SystemStateBroadcaster.class.getName());
private final Timer timer;
private final Object monitor;
private ClusterStateBundle clusterStateBundle;
private final List<SetClusterStateRequest> setClusterStateReplies = new LinkedList<>();
private final static long minTimeBetweenNodeErrorLogging = 10 * 60 * 1000;
private final Map<Node, Long> lastErrorReported = new TreeMap<>();
private int lastClusterStateInSync = 0;
private final SetClusterStateWaiter setClusterStateWaiter = new SetClusterStateWaiter();
public SystemStateBroadcaster(Timer timer, Object monitor) {
this.timer = timer;
this.monitor = monitor;
}
public void handleNewClusterStates(ClusterStateBundle state) {
clusterStateBundle = state;
}
public ClusterState getClusterState() {
return clusterStateBundle.getBaselineClusterState();
}
public boolean hasBroadcastedClusterStateBundle() {
return clusterStateBundle != null;
}
public void resetBroadcastedClusterStateBundle() {
clusterStateBundle = null;
}
public ClusterStateBundle getClusterStateBundle() {
return clusterStateBundle;
}
private void reportNodeError(boolean nodeOk, NodeInfo info, String message) {
long time = timer.getCurrentTimeInMillis();
Long lastReported = lastErrorReported.get(info.getNode());
boolean alreadySeen = (lastReported != null && time - lastReported < minTimeBetweenNodeErrorLogging);
log.log((nodeOk && !alreadySeen) ? LogLevel.WARNING : LogLevel.DEBUG, message);
if (!alreadySeen) {
lastErrorReported.put(info.getNode(), time);
}
}
public boolean processResponses() {
boolean anyResponsesFound = false;
synchronized(monitor) {
for (SetClusterStateRequest req : setClusterStateReplies) {
anyResponsesFound = true;
NodeInfo info = req.getNodeInfo();
boolean nodeOk = info.getReportedState().getState().oneOf("uir");
int version = req.getClusterStateVersion();
if (req.getReply().isError()) {
info.setSystemStateVersionAcknowledged(version, false);
if (req.getReply().getReturnCode() != Communicator.TRANSIENT_ERROR) {
if (info.getNewestSystemStateVersionSent() == version) {
reportNodeError(nodeOk, info,
"Got error response " + req.getReply().getReturnCode() + ": " + req.getReply().getReturnMessage()
+ " from " + info + " setsystemstate request.");
}
}
} else {
info.setSystemStateVersionAcknowledged(version, true);
log.log(LogLevel.DEBUG, "Node " + info + " acked system state version " + version + ".");
lastErrorReported.remove(info.getNode());
}
}
setClusterStateReplies.clear();
}
return anyResponsesFound;
}
private boolean nodeNeedsClusterState(NodeInfo node) {
if (node.getSystemStateVersionAcknowledged() == clusterStateBundle.getVersion()) {
return false; // No point in sending if node already has updated system state
}
if (node.getRpcAddress() == null || node.isRpcAddressOutdated()) {
return false; // Can't set state on nodes we don't know where are
}
if (node.getReportedState().getState() == State.MAINTENANCE ||
node.getReportedState().getState() == State.DOWN ||
node.getReportedState().getState() == State.STOPPING)
{
return false; // No point in sending system state to nodes that can't receive messages or don't want them
}
return true;
}
private List<NodeInfo> resolveStateVersionSendSet(DatabaseHandler.Context dbContext) {
return dbContext.getCluster().getNodeInfo().stream()
.filter(this::nodeNeedsClusterState)
.filter(node -> !newestStateAlreadySentToNode(node))
.collect(Collectors.toList());
}
private boolean newestStateAlreadySentToNode(NodeInfo node) {
return (node.getNewestSystemStateVersionSent() == clusterStateBundle.getVersion());
}
/**
* Checks if all distributor nodes have ACKed the most recent cluster state. Iff this
* is the case, triggers handleAllDistributorsInSync() on the provided FleetController
* object and updates the broadcaster's last known in-sync cluster state version.
*/
void checkIfClusterStateIsAckedByAllDistributors(DatabaseHandler database,
DatabaseHandler.Context dbContext,
FleetController fleetController) throws InterruptedException {
if ((clusterStateBundle == null) || (lastClusterStateInSync == clusterStateBundle.getVersion())) {
return; // Nothing to do for the current state
}
final int currentStateVersion = clusterStateBundle.getVersion();
boolean anyOutdatedDistributorNodes = dbContext.getCluster().getNodeInfo().stream()
.filter(NodeInfo::isDistributor)
.anyMatch(this::nodeNeedsClusterState);
if (!anyOutdatedDistributorNodes && (currentStateVersion > lastClusterStateInSync)) {
log.log(LogLevel.DEBUG, "All distributors have newest clusterstate, updating start timestamps in zookeeper and clearing them from cluster state");
lastClusterStateInSync = currentStateVersion;
fleetController.handleAllDistributorsInSync(database, dbContext);
}
}
public boolean broadcastNewState(DatabaseHandler.Context dbContext, Communicator communicator) {
if (clusterStateBundle == null) {
return false;
}
ClusterState baselineState = clusterStateBundle.getBaselineClusterState();
if (!baselineState.isOfficial()) {
log.log(LogLevel.INFO, String.format("Publishing cluster state version %d", baselineState.getVersion()));
baselineState.setOfficial(true); // FIXME this violates state bundle immutability
}
List<NodeInfo> recipients = resolveStateVersionSendSet(dbContext);
for (NodeInfo node : recipients) {
if (nodeNeedsToObserveStartupTimestamps(node)) {
// TODO this is the same for all nodes, compute only once
ClusterStateBundle modifiedBundle = clusterStateBundle.cloneWithMapper(state -> buildModifiedClusterState(state, dbContext));
log.log(LogLevel.DEBUG, "Sending modified cluster state version " + baselineState.getVersion()
+ " to node " + node + ": " + modifiedBundle);
communicator.setSystemState(modifiedBundle, node, setClusterStateWaiter);
} else {
log.log(LogLevel.DEBUG, "Sending system state version " + baselineState.getVersion() + " to node " + node
+ ". (went down time " + node.getWentDownWithStartTime() + ", node start time " + node.getStartTimestamp() + ")");
communicator.setSystemState(clusterStateBundle, node, setClusterStateWaiter);
}
}
return !recipients.isEmpty();
}
public int lastClusterStateVersionInSync() { return lastClusterStateInSync; }
private static boolean nodeNeedsToObserveStartupTimestamps(NodeInfo node) {
return node.getStartTimestamp() != 0 && node.getWentDownWithStartTime() == node.getStartTimestamp();
}
private static ClusterState buildModifiedClusterState(ClusterState sourceState, DatabaseHandler.Context dbContext) {
ClusterState newState = sourceState.clone();
for (NodeInfo n : dbContext.getCluster().getNodeInfo()) {
NodeState ns = newState.getNodeState(n.getNode());
if (!n.isDistributor() && ns.getStartTimestamp() == 0) {
ns.setStartTimestamp(n.getStartTimestamp());
newState.setNodeState(n.getNode(), ns);
}
}
return newState;
}
private class SetClusterStateWaiter implements Communicator.Waiter<SetClusterStateRequest> {
@Override
public void done(SetClusterStateRequest reply) {
synchronized (monitor) {
setClusterStateReplies.add(reply);
}
}
}
private class ActivateClusterStateVersionWaiter implements Communicator.Waiter<ActivateClusterStateVersionRequest> {
@Override
public void done(ActivateClusterStateVersionRequest reply) {
// TODO
}
}
}
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