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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.archive;
import com.yahoo.config.provision.TenantName;
import com.yahoo.config.provision.zone.ZoneId;
import com.yahoo.vespa.hosted.controller.Controller;
import com.yahoo.vespa.hosted.controller.api.integration.archive.ArchiveBucket;
import com.yahoo.vespa.hosted.controller.api.integration.archive.ArchiveService;
import com.yahoo.vespa.hosted.controller.persistence.CuratorDb;
import java.net.URI;
import java.util.HashSet;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;
/**
* This class decides which tenant goes in what bucket, and creates new buckets when required.
*
* @author andreer
*/
public class CuratorArchiveBucketDb {
/**
* Archive URIs are often requested because they are returned in /application/v4 API. Since they
* never change, it's safe to cache them and only update on misses
*/
private final Map<ZoneId, Map<TenantName, String>> archiveUriCache = new ConcurrentHashMap<>();
private final ArchiveService archiveService;
private final CuratorDb curatorDb;
public CuratorArchiveBucketDb(Controller controller) {
this.archiveService = controller.serviceRegistry().archiveService();
this.curatorDb = controller.curator();
}
public Optional<URI> archiveUriFor(ZoneId zoneId, TenantName tenant, boolean createIfMissing) {
return getBucketNameFromCache(zoneId, tenant)
.or(() -> findAndUpdateArchiveUriCache(zoneId, tenant, buckets(zoneId)))
.or(() -> createIfMissing ? Optional.of(assignToBucket(zoneId, tenant)) : Optional.empty())
.map(bucketName -> archiveService.bucketURI(zoneId, bucketName));
}
private String assignToBucket(ZoneId zoneId, TenantName tenant) {
try (var lock = curatorDb.lockArchiveBuckets(zoneId)) {
Set<ArchiveBucket> zoneBuckets = new HashSet<>(buckets(zoneId));
return findAndUpdateArchiveUriCache(zoneId, tenant, zoneBuckets) // Some other thread might have assigned it before we grabbed the lock
.orElseGet(() -> {
// If not, find an existing bucket with space
Optional<ArchiveBucket> unfilledBucket = zoneBuckets.stream()
.filter(bucket -> archiveService.canAddTenantToBucket(zoneId, bucket))
.findAny();
// And place the tenant in that bucket.
if (unfilledBucket.isPresent()) {
var unfilled = unfilledBucket.get();
zoneBuckets.remove(unfilled);
zoneBuckets.add(unfilled.withTenant(tenant));
curatorDb.writeArchiveBuckets(zoneId, zoneBuckets);
return unfilled.bucketName();
}
// We'll have to create a new bucket
var newBucket = archiveService.createArchiveBucketFor(zoneId).withTenant(tenant);
zoneBuckets.add(newBucket);
curatorDb.writeArchiveBuckets(zoneId, zoneBuckets);
updateArchiveUriCache(zoneId, zoneBuckets);
return newBucket.bucketName();
});
}
}
public Set<ArchiveBucket> buckets(ZoneId zoneId) {
return curatorDb.readArchiveBuckets(zoneId);
}
private Optional<String> findAndUpdateArchiveUriCache(ZoneId zoneId, TenantName tenant, Set<ArchiveBucket> zoneBuckets) {
Optional<String> bucketName = zoneBuckets.stream()
.filter(bucket -> bucket.tenants().contains(tenant))
.findAny()
.map(ArchiveBucket::bucketName);
if (bucketName.isPresent()) updateArchiveUriCache(zoneId, zoneBuckets);
return bucketName;
}
private Optional<String> getBucketNameFromCache(ZoneId zoneId, TenantName tenantName) {
return Optional.ofNullable(archiveUriCache.get(zoneId)).map(map -> map.get(tenantName));
}
private void updateArchiveUriCache(ZoneId zoneId, Set<ArchiveBucket> zoneBuckets) {
Map<TenantName, String> bucketNameByTenant = zoneBuckets.stream()
.flatMap(bucket -> bucket.tenants().stream()
.map(tenant -> Map.entry(tenant, bucket.bucketName())))
.collect(Collectors.toUnmodifiableMap(Map.Entry::getKey, Map.Entry::getValue));
archiveUriCache.put(zoneId, bucketNameByTenant);
}
}
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