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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.maintenance;
import com.yahoo.config.FileReference;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.subscription.ConfigSourceSet;
import com.yahoo.jrt.Supervisor;
import com.yahoo.jrt.Transport;
import com.yahoo.vespa.config.ConnectionPool;
import com.yahoo.vespa.config.server.ApplicationRepository;
import com.yahoo.vespa.config.server.session.Session;
import com.yahoo.vespa.config.server.session.SessionRepository;
import com.yahoo.vespa.config.server.tenant.Tenant;
import com.yahoo.vespa.curator.Curator;
import com.yahoo.vespa.defaults.Defaults;
import com.yahoo.vespa.filedistribution.FileDistributionConnectionPool;
import com.yahoo.vespa.filedistribution.FileDownloader;
import com.yahoo.vespa.filedistribution.FileReferenceDownload;
import java.io.File;
import java.time.Duration;
import java.util.List;
import java.util.Optional;
import java.util.logging.Logger;
import static com.yahoo.vespa.config.server.filedistribution.FileDistributionUtil.fileReferenceExistsOnDisk;
import static com.yahoo.vespa.config.server.filedistribution.FileDistributionUtil.getOtherConfigServersInCluster;
/**
* Verifies that all active sessions has an application package on local disk.
* If not, the package is downloaded with file distribution. This can happen e.g.
* if a config server is down when the application is deployed. This maintainer should only be run
* if there is more than 1 config server
*
* @author gjoranv
*/
public class ApplicationPackageMaintainer extends ConfigServerMaintainer {
private static final Logger log = Logger.getLogger(ApplicationPackageMaintainer.class.getName());
private final File downloadDirectory;
private final Supervisor supervisor = new Supervisor(new Transport("filedistribution-pool")).setDropEmptyBuffers(true);
private final FileDownloader fileDownloader;
ApplicationPackageMaintainer(ApplicationRepository applicationRepository, Curator curator, Duration interval) {
super(applicationRepository, curator, applicationRepository.flagSource(), applicationRepository.clock(), interval, false);
this.downloadDirectory = new File(Defaults.getDefaults().underVespaHome(applicationRepository.configserverConfig().fileReferencesDir()));
this.fileDownloader = createFileDownloader(applicationRepository, downloadDirectory, supervisor);
}
@Override
protected double maintain() {
int attempts = 0;
int failures = 0;
for (var applicationId : applicationRepository.listApplications()) {
if (shuttingDown())
break;
log.finest(() -> "Verifying application package for " + applicationId);
Optional<Session> session = applicationRepository.getActiveSession(applicationId);
if (session.isEmpty()) continue; // App might be deleted after call to listApplications() or not activated yet (bootstrap phase)
Optional<FileReference> appFileReference = session.get().getApplicationPackageReference();
if (appFileReference.isPresent()) {
long sessionId = session.get().getSessionId();
attempts++;
if (!fileReferenceExistsOnDisk(downloadDirectory, appFileReference.get())) {
log.fine(() -> "Downloading application package with file reference " + appFileReference +
" for " + applicationId + " (session " + sessionId + ")");
FileReferenceDownload download = new FileReferenceDownload(appFileReference.get(),
this.getClass().getSimpleName(),
false);
if (fileDownloader.getFile(download).isEmpty()) {
failures++;
log.info("Downloading application package (" + appFileReference + ")" +
" for " + applicationId + " (session " + sessionId + ") unsuccessful. " +
"Can be ignored unless it happens many times over a long period of time, retries is expected");
continue;
}
}
createLocalSessionIfMissing(applicationId, sessionId);
}
}
return asSuccessFactorDeviation(attempts, failures);
}
private static FileDownloader createFileDownloader(ApplicationRepository applicationRepository,
File downloadDirectory,
Supervisor supervisor) {
List<String> otherConfigServersInCluster = getOtherConfigServersInCluster(applicationRepository.configserverConfig());
ConfigSourceSet configSourceSet = new ConfigSourceSet(otherConfigServersInCluster);
ConnectionPool connectionPool = new FileDistributionConnectionPool(configSourceSet, supervisor);
return new FileDownloader(connectionPool, supervisor, downloadDirectory, Duration.ofSeconds(300));
}
@Override
public void awaitShutdown() {
supervisor.transport().shutdown().join();
fileDownloader.close();
super.awaitShutdown();
}
private void createLocalSessionIfMissing(ApplicationId applicationId, long sessionId) {
Tenant tenant = applicationRepository.getTenant(applicationId);
SessionRepository sessionRepository = tenant.getSessionRepository();
if (sessionRepository.getLocalSession(sessionId) == null)
sessionRepository.createLocalSessionFromDistributedApplicationPackage(sessionId);
}
}
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