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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* @class Communicator
*
* Responsible for doing RPC requests to VDS nodes.
*/
package com.yahoo.vespa.clustercontroller.core.rpc;
import com.yahoo.jrt.*;
import com.yahoo.vdslib.state.NodeState;
import com.yahoo.vdslib.state.ClusterState;
import com.yahoo.vdslib.state.State;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.clustercontroller.core.*;
import java.util.logging.Logger;
import static com.google.common.base.Preconditions.checkArgument;
/**
* This class is not thread-safe.
*/
public class RPCCommunicator implements Communicator {
public static final Logger log = Logger.getLogger(RPCCommunicator.class.getName());
private final Timer timer;
private final Supervisor supervisor;
private double nodeStateRequestTimeoutIntervalMaxSeconds;
private int nodeStateRequestTimeoutIntervalStartPercentage;
private int nodeStateRequestTimeoutIntervalStopPercentage;
private int nodeStateRequestRoundTripTimeMaxSeconds;
private final int fleetControllerIndex;
public RPCCommunicator(
final Timer t,
final int index,
final int nodeStateRequestTimeoutIntervalMaxMs,
final int nodeStateRequestTimeoutIntervalStartPercentage,
final int nodeStateRequestTimeoutIntervalStopPercentage,
final int nodeStateRequestRoundTripTimeMaxSeconds) {
this.timer = t;
this.fleetControllerIndex = index;
checkArgument(nodeStateRequestTimeoutIntervalMaxMs > 0);
checkArgument(nodeStateRequestTimeoutIntervalStartPercentage >= 0);
checkArgument(nodeStateRequestTimeoutIntervalStartPercentage <= 100);
checkArgument(nodeStateRequestTimeoutIntervalStopPercentage >= nodeStateRequestTimeoutIntervalStartPercentage);
checkArgument(nodeStateRequestTimeoutIntervalStartPercentage <= 100);
checkArgument(nodeStateRequestRoundTripTimeMaxSeconds >= 0);
this.nodeStateRequestTimeoutIntervalMaxSeconds = nodeStateRequestTimeoutIntervalMaxMs / 1000D;
this.nodeStateRequestTimeoutIntervalStartPercentage = nodeStateRequestTimeoutIntervalStartPercentage;
this.nodeStateRequestTimeoutIntervalStopPercentage = nodeStateRequestTimeoutIntervalStopPercentage;
this.nodeStateRequestRoundTripTimeMaxSeconds = nodeStateRequestRoundTripTimeMaxSeconds;
this.supervisor = new Supervisor(new Transport());
}
public void shutdown() {
supervisor.transport().shutdown().join();
}
public Target getConnection(final NodeInfo node) {
Target t = node.getConnection();
if (t == null || !t.isValid()) {
t = node.setConnection(
supervisor.connect(new Spec(node.getRpcAddress())));
}
return t;
}
public void doVersion0HandShake(Target connection, final NodeInfo node) {
log.log(LogLevel.DEBUG, "Sending version 0 handshake request as version has been set down to 0 for " + node);
Request req = new Request("vespa.storage.connect");
req.parameters().add(new StringValue("storage/cluster." + node.getCluster().getName() + (node.isDistributor() ? "/distributor/" : "/storage/") + node.getNodeIndex()));
connection.invokeAsync(req, 10.0, new RequestWaiter(){
public void handleRequestDone(Request req) {
if (req.isError()) {
log.log(LogLevel.WARNING, "Failed to do version 0 handshake towards " + node + ", " + req.errorCode() + ": " + req.errorMessage());
} else if (!req.checkReturnTypes("i")) {
log.log(LogLevel.WARNING, "Wrong arguments returned from version 0 handshake attempt towards " + node);
} else if (req.returnValues().get(0).asInt32() == 1) {
log.log(LogLevel.DEBUG, "Session already opened when handshaking towards " + node + ".");
} else if (req.returnValues().get(0).asInt32() > 1) {
log.log(LogLevel.WARNING, "Handshaking attempt towards " + node + " failed with code " + req.returnValues().get(0).asInt32());
}
}
});
node.setConnectionVersion(0);
}
public void clearOldStoredNodeState(Target connection, final NodeInfo node) {
log.log(LogLevel.DEBUG, "In case old node had stored a wanted state it is reporting, send a command to clear any unwanted stored state.");
Request req = new Request("setnodestate");
req.parameters().add(new StringValue(""));
connection.invokeAsync(req, 10.0, new RequestWaiter() {
public void handleRequestDone(Request req) {
if (req.isError()) {
if (node.getReportedState().getState() != State.DOWN) {
log.log(LogLevel.WARNING, "Failed to clear nodestate on old node " + node + ", " + req.errorCode() + ": " + req.errorMessage());
}
} else if (!req.checkReturnTypes("is")) {
log.log(LogLevel.WARNING, "Wrong arguments returned from version 0 setnodestate attempt to clear any unwanted state on " + node);
}
}
});
}
@Override
public void propagateOptions(final FleetControllerOptions options) {
checkArgument(options.nodeStateRequestTimeoutMS > 0);
checkArgument(options.nodeStateRequestTimeoutEarliestPercentage >= 0);
checkArgument(options.nodeStateRequestTimeoutEarliestPercentage <= 100);
checkArgument(options.nodeStateRequestTimeoutLatestPercentage
>= options.nodeStateRequestTimeoutEarliestPercentage);
checkArgument(options.nodeStateRequestTimeoutLatestPercentage <= 100);
checkArgument(options.nodeStateRequestRoundTripTimeMaxSeconds >= 0);
this.nodeStateRequestTimeoutIntervalMaxSeconds = options.nodeStateRequestTimeoutMS / 1000.0;
this.nodeStateRequestTimeoutIntervalStartPercentage = options.nodeStateRequestTimeoutEarliestPercentage;
this.nodeStateRequestTimeoutIntervalStopPercentage = options.nodeStateRequestTimeoutLatestPercentage;
this.nodeStateRequestRoundTripTimeMaxSeconds = options.nodeStateRequestRoundTripTimeMaxSeconds;
}
@Override
public void getNodeState(NodeInfo node, Waiter<GetNodeStateRequest> externalWaiter) {
Target connection = getConnection(node);
if ( ! connection.isValid()) {
log.log(LogLevel.DEBUG, "Connection to " + node.getRpcAddress() + " could not be created.");
}
if (node.getVersion() == 0 && node.getConnectionVersion() > 0) {
doVersion0HandShake(connection, node);
clearOldStoredNodeState(connection, node);
}
NodeState currentState = node.getReportedState();
Request req;
if (node.getVersion() == 0) {
req = new Request("getnodestate");
} else {
req = new Request(node.getVersion() == 1 ? "getnodestate2" : "getnodestate3");
req.parameters().add(new StringValue(
currentState.getState().equals(State.DOWN) || node.getConnectionAttemptCount() > 0
? "unknown" : currentState.serialize()));
req.parameters().add(new Int32Value(generateNodeStateRequestTimeoutMs()));
if (node.getVersion() > 1) {
req.parameters().add(new Int32Value(fleetControllerIndex));
}
}
RPCGetNodeStateRequest stateRequest = new RPCGetNodeStateRequest(node, req);
RPCGetNodeStateWaiter waiter = new RPCGetNodeStateWaiter(stateRequest, externalWaiter, timer);
double requestTimeoutSeconds =
nodeStateRequestTimeoutIntervalMaxSeconds + nodeStateRequestRoundTripTimeMaxSeconds;
connection.invokeAsync(req, requestTimeoutSeconds, waiter);
node.setCurrentNodeStateRequest(stateRequest, timer.getCurrentTimeInMillis());
node.lastRequestInfoConnection = connection;
}
@Override
public void setSystemState(ClusterStateBundle stateBundle, NodeInfo node, Waiter<SetClusterStateRequest> externalWaiter) {
final RPCSetClusterStateWaiter waiter = new RPCSetClusterStateWaiter(externalWaiter, timer);
final ClusterState baselineState = stateBundle.getBaselineClusterState();
Target connection = getConnection(node);
if (!connection.isValid()) {
log.log(LogLevel.DEBUG, "Connection to " + node.getRpcAddress() + " could not be created.");
return;
}
if (node.getVersion() == 0 && node.getConnectionVersion() > 0) {
doVersion0HandShake(connection, node);
clearOldStoredNodeState(connection, node);
}
Request req;
if (node.getVersion() == 0) {
req = new Request("setsystemstate");
req.parameters().add(new StringValue(baselineState.toString(true)));
} else {
req = new Request("setsystemstate2");
req.parameters().add(new StringValue(baselineState.toString(false)));
}
RPCSetClusterStateRequest stateRequest = new RPCSetClusterStateRequest(node, req, baselineState.getVersion());
waiter.setRequest(stateRequest);
connection.invokeAsync(req, 60, waiter);
node.setSystemStateVersionSent(baselineState);
}
// protected for testing.
protected int generateNodeStateRequestTimeoutMs() {
final double intervalFraction = Math.random();
final double earliestTimeoutSeconds =
nodeStateRequestTimeoutIntervalMaxSeconds * nodeStateRequestTimeoutIntervalStartPercentage / 100.0;
final double latestTimeoutSeconds =
nodeStateRequestTimeoutIntervalMaxSeconds * nodeStateRequestTimeoutIntervalStopPercentage / 100.0;
final double interval = latestTimeoutSeconds - earliestTimeoutSeconds;
final double timeoutSeconds = earliestTimeoutSeconds + intervalFraction * interval;
return (int) (timeoutSeconds * 1000);
}
}
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