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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.config.server.deploy;
import com.yahoo.component.Version;
import com.yahoo.config.application.api.DeployLogger;
import com.yahoo.config.provision.HostFilter;
import com.yahoo.config.provision.Provisioner;
import com.yahoo.log.LogLevel;
import com.yahoo.path.Path;
import com.yahoo.transaction.NestedTransaction;
import com.yahoo.transaction.Transaction;
import com.yahoo.vespa.config.server.tenant.ActivateLock;
import com.yahoo.vespa.config.server.ApplicationRepository;
import com.yahoo.vespa.config.server.TimeoutBudget;
import com.yahoo.vespa.config.server.http.InternalServerException;
import com.yahoo.vespa.config.server.session.LocalSession;
import com.yahoo.vespa.config.server.session.LocalSessionRepo;
import com.yahoo.vespa.config.server.session.PrepareParams;
import com.yahoo.vespa.config.server.session.Session;
import com.yahoo.vespa.config.server.session.SilentDeployLogger;
import java.time.Clock;
import java.time.Duration;
import java.util.Optional;
import java.util.logging.Logger;
/**
* The process of deploying an application.
* Deployments are created by a {@link ApplicationRepository}.
* Instances of this are not multithread safe.
*
* @author lulf
* @author bratseth
*/
public class Deployment implements com.yahoo.config.provision.Deployment {
private static final Logger log = Logger.getLogger(Deployment.class.getName());
/** The session containing the application instance to activate */
private final LocalSession session;
private final LocalSessionRepo localSessionRepo;
/** The path to the tenant, or null if not available (only used during prepare) */
private final Path tenantPath;
private final Optional<Provisioner> hostProvisioner;
private final ActivateLock activateLock;
private final Duration timeout;
private final Clock clock;
private final DeployLogger logger = new SilentDeployLogger();
/** The Vespa version this application should run on */
private final Version version;
private boolean prepared = false;
/** Whether this model should be validated (only takes effect if prepared=false) */
private boolean validate;
private boolean ignoreLockFailure = false;
private boolean ignoreSessionStaleFailure = false;
private Deployment(LocalSession session, LocalSessionRepo localSessionRepo, Path tenantPath,
Optional<Provisioner> hostProvisioner, ActivateLock activateLock,
Duration timeout, Clock clock, boolean prepared, boolean validate, Version version) {
this.session = session;
this.localSessionRepo = localSessionRepo;
this.tenantPath = tenantPath;
this.hostProvisioner = hostProvisioner;
this.activateLock = activateLock;
this.timeout = timeout;
this.clock = clock;
this.prepared = prepared;
this.validate = validate;
this.version = version;
}
public static Deployment unprepared(LocalSession session, LocalSessionRepo localSessionRepo, Path tenantPath,
Optional<Provisioner> hostProvisioner, ActivateLock activateLock,
Duration timeout, Clock clock, boolean validate, Version version) {
return new Deployment(session, localSessionRepo, tenantPath, hostProvisioner, activateLock,
timeout, clock, false, validate, version);
}
public static Deployment prepared(LocalSession session, LocalSessionRepo localSessionRepo,
Optional<Provisioner> hostProvisioner, ActivateLock activateLock,
Duration timeout, Clock clock) {
return new Deployment(session, localSessionRepo, null, hostProvisioner, activateLock,
timeout, clock, true, true, session.getVespaVersion());
}
public Deployment setIgnoreLockFailure(boolean ignoreLockFailure) {
this.ignoreLockFailure = ignoreLockFailure;
return this;
}
public Deployment setIgnoreSessionStaleFailure(boolean ignoreSessionStaleFailure) {
this.ignoreSessionStaleFailure = ignoreSessionStaleFailure;
return this;
}
/** Prepares this. This does nothing if this is already prepared */
@Override
public void prepare() {
if (prepared) return;
TimeoutBudget timeoutBudget = new TimeoutBudget(clock, timeout);
session.prepare(logger,
new PrepareParams.Builder().applicationId(session.getApplicationId())
.timeoutBudget(timeoutBudget)
.ignoreValidationErrors( ! validate)
.vespaVersion(version.toString())
.build(),
Optional.empty(),
tenantPath);
this.prepared = true;
}
/** Activates this. If it is not already prepared, this will call prepare first. */
@Override
public void activate() {
if (! prepared)
prepare();
TimeoutBudget timeoutBudget = new TimeoutBudget(clock, timeout);
long sessionId = session.getSessionId();
validateSessionStatus(session);
try {
log.log(LogLevel.DEBUG, "Trying to acquire lock " + activateLock + " for session " + sessionId);
boolean acquired = activateLock.acquire(timeoutBudget, ignoreLockFailure);
if ( ! acquired) {
log.log(LogLevel.DEBUG, "Acquiring " + activateLock + " for session " + sessionId + " returned false");
}
log.log(LogLevel.DEBUG, "Lock acquired " + activateLock + " for session " + sessionId);
NestedTransaction transaction = new NestedTransaction();
transaction.add(deactivateCurrentActivateNew(localSessionRepo.getActiveSession(session.getApplicationId()), session, ignoreSessionStaleFailure));
if (hostProvisioner.isPresent()) {
hostProvisioner.get().activate(transaction, session.getApplicationId(), session.getProvisionInfo().getHosts());
}
transaction.commit();
session.waitUntilActivated(timeoutBudget);
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new InternalServerException("Error activating application", e);
} finally {
log.log(LogLevel.DEBUG, "Trying to release lock " + activateLock + " for session " + sessionId);
activateLock.release();
log.log(LogLevel.DEBUG, "Lock released " + activateLock + " for session " + sessionId);
}
log.log(LogLevel.INFO, session.logPre() + "Session " + sessionId +
" activated successfully using " +
( hostProvisioner.isPresent() ? hostProvisioner.get() : "no host provisioner" ) +
". Config generation " + session.getMetaData().getGeneration());
}
/**
* Request a restart of services of this application on hosts matching the filter.
* This is sometimes needed after activation, but can also be requested without
* doing prepare and activate in the same session.
*/
public void restart(HostFilter filter) {
hostProvisioner.get().restart(session.getApplicationId(), filter);
}
/** Exposes the session of this for testing only */
public LocalSession session() { return session; }
private long validateSessionStatus(LocalSession localSession) {
long sessionId = localSession.getSessionId();
if (Session.Status.NEW.equals(localSession.getStatus())) {
throw new IllegalStateException(localSession.logPre() + "Session " + sessionId + " is not prepared");
} else if (Session.Status.ACTIVATE.equals(localSession.getStatus())) {
throw new IllegalStateException(localSession.logPre() + "Session " + sessionId + " is already active");
}
return sessionId;
}
private Transaction deactivateCurrentActivateNew(LocalSession currentActiveSession, LocalSession session, boolean ignoreStaleSessionFailure) {
Transaction transaction = session.createActivateTransaction();
if (isValidSession(currentActiveSession)) {
checkIfActiveHasChanged(session, currentActiveSession, ignoreStaleSessionFailure);
checkIfActiveIsNewerThanSessionToBeActivated(session.getSessionId(), currentActiveSession.getSessionId());
transaction.add(currentActiveSession.createDeactivateTransaction().operations());
}
return transaction;
}
private boolean isValidSession(LocalSession session) {
return session != null;
}
private void checkIfActiveHasChanged(LocalSession session, LocalSession currentActiveSession, boolean ignoreStaleSessionFailure) {
long activeSessionAtCreate = session.getActiveSessionAtCreate();
log.log(LogLevel.DEBUG, currentActiveSession.logPre() + "active session id at create time=" + activeSessionAtCreate);
if (activeSessionAtCreate == 0) return; // No active session at create
long sessionId = session.getSessionId();
long currentActiveSessionSessionId = currentActiveSession.getSessionId();
log.log(LogLevel.DEBUG, currentActiveSession.logPre() + "sessionId=" + sessionId +
", current active session=" + currentActiveSessionSessionId);
if (currentActiveSession.isNewerThan(activeSessionAtCreate) &&
currentActiveSessionSessionId != sessionId) {
String errMsg = currentActiveSession.logPre()+"Cannot activate session " +
sessionId + " because the currently active session (" +
currentActiveSessionSessionId + ") has changed since session " + sessionId +
" was created (was " + activeSessionAtCreate + " at creation time)";
if (ignoreStaleSessionFailure) {
log.warning(errMsg + " (Continuing because of force.)");
} else {
throw new IllegalStateException(errMsg);
}
}
}
// As of now, config generation is based on session id, and config generation must be an monotonically
// increasing number
private void checkIfActiveIsNewerThanSessionToBeActivated(long sessionId, long currentActiveSessionId) {
if (sessionId < currentActiveSessionId) {
throw new IllegalArgumentException("It is not possible to activate session " + sessionId +
", because it is older than current active session (" +
currentActiveSessionId + ")");
}
}
}
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