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Keeps track of node assignment in a multi-application setup.
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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.hosted.provision.persistence;
import ai.vespa.http.DomainName;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.yahoo.collections.Pair;
import com.yahoo.component.Version;
import com.yahoo.concurrent.UncheckedTimeoutException;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.ApplicationLockException;
import com.yahoo.config.provision.ApplicationTransaction;
import com.yahoo.config.provision.HostName;
import com.yahoo.config.provision.NodeFlavors;
import com.yahoo.config.provision.NodeType;
import com.yahoo.path.Path;
import com.yahoo.transaction.NestedTransaction;
import com.yahoo.transaction.Transaction;
import com.yahoo.vespa.curator.Curator;
import com.yahoo.vespa.curator.Lock;
import com.yahoo.vespa.curator.recipes.CuratorCounter;
import com.yahoo.vespa.curator.transaction.CuratorOperations;
import com.yahoo.vespa.curator.transaction.CuratorTransaction;
import com.yahoo.vespa.hosted.provision.LockedNodeList;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.applications.Application;
import com.yahoo.vespa.hosted.provision.archive.ArchiveUris;
import com.yahoo.vespa.hosted.provision.lb.LoadBalancer;
import com.yahoo.vespa.hosted.provision.lb.LoadBalancerId;
import com.yahoo.vespa.hosted.provision.node.Agent;
import com.yahoo.vespa.hosted.provision.node.Status;
import com.yahoo.vespa.hosted.provision.os.OsVersionChange;
import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.TreeMap;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import static com.yahoo.stream.CustomCollectors.toLinkedMap;
import static java.util.stream.Collectors.collectingAndThen;
/**.
* A persistent database for the contents of the node repository, backed by {@link CachingCurator}.
*
* Nodes are stored in /provision/v1/nodes/[hostname].
*
* The responsibility of this class is to turn operations on the level of node states, applications and nodes
* into operations on the level of file paths and bytes.
*
* @author bratseth
*/
public class CuratorDb {
private static final Logger log = Logger.getLogger(CuratorDb.class.getName());
private static final Path root = Path.fromString("/provision/v1");
private static final Path lockPath = root.append("locks");
private static final Path nodesPath = root.append("nodes");
private static final Path loadBalancersPath = root.append("loadBalancers");
private static final Path applicationsPath = root.append("applications");
private static final Path inactiveJobsPath = root.append("inactiveJobs");
private static final Path infrastructureVersionsPath = root.append("infrastructureVersions");
private static final Path osVersionsPath = root.append("osVersions");
private static final Path firmwareCheckPath = root.append("firmwareCheck");
private static final Path archiveUrisPath = root.append("archiveUri");
private static final Duration defaultLockTimeout = Duration.ofMinutes(1);
private final NodeSerializer nodeSerializer;
private final CachingCurator db;
private final Clock clock;
private final CuratorCounter provisionIndexCounter;
private final CuratorCounter loadBalancerPoolHead;
private final CuratorCounter loadBalancerPoolTail;
/** Simple cache for deserialized node objects, based on their ZK node version. */
private final Cache> cachedNodes = CacheBuilder.newBuilder().recordStats().build();
public CuratorDb(NodeFlavors flavors, Curator curator, Clock clock, boolean useCache) {
this.nodeSerializer = new NodeSerializer(flavors);
this.db = new CachingCurator(curator, root, useCache);
this.clock = clock;
this.provisionIndexCounter = new CuratorCounter(curator, root.append("provisionIndexCounter"));
this.loadBalancerPoolHead = new CuratorCounter(curator, root.append("loadBalancerPoolHead"));
this.loadBalancerPoolTail = new CuratorCounter(curator, root.append("loadBalancerPoolTail"));
initZK();
}
public List cluster() {
return db.cluster().stream().map(HostName::value).toList();
}
private void initZK() {
db.create(root);
db.create(nodesPath);
db.create(applicationsPath);
db.create(inactiveJobsPath);
db.create(infrastructureVersionsPath);
db.create(osVersionsPath);
db.create(firmwareCheckPath);
db.create(archiveUrisPath);
db.create(loadBalancersPath);
provisionIndexCounter.initialize(100);
loadBalancerPoolHead.initialize(1);
loadBalancerPoolTail.initialize(1);
}
/** Adds a set of nodes. Rollbacks/fails transaction if any node is not in the expected state. */
public List addNodesInState(LockedNodeList nodes, Node.State expectedState, Agent agent, NestedTransaction transaction) {
CuratorTransaction curatorTransaction = db.newCuratorTransactionIn(transaction);
for (Node node : nodes) {
if (node.state() != expectedState)
throw new IllegalArgumentException(node + " is not in the " + expectedState + " state");
node = node.with(node.history().recordStateTransition(null, expectedState, agent, clock.instant()));
byte[] serialized = nodeSerializer.toJson(node);
curatorTransaction.add(CuratorOperations.create(nodePath(node).getAbsolute(), serialized));
}
transaction.onCommitted(() -> nodes.forEach(node -> log.log(Level.INFO, "Added " + node)));
return nodes.asList();
}
public List addNodesInState(LockedNodeList nodes, Node.State expectedState, Agent agent) {
NestedTransaction transaction = new NestedTransaction();
List writtenNodes = addNodesInState(nodes, expectedState, agent, transaction);
transaction.commit();
return writtenNodes;
}
/** Removes given nodes in transaction */
public void removeNodes(List nodes, NestedTransaction transaction) {
for (Node node : nodes) {
CuratorTransaction curatorTransaction = db.newCuratorTransactionIn(transaction);
curatorTransaction.add(CuratorOperations.delete(nodePath(node).getAbsolute()));
}
transaction.onCommitted(() -> nodes.forEach(node -> log.log(Level.INFO, "Removed node " + node.hostname() + " in state " + node.state())));
}
/**
* Writes the given nodes and returns a copy of the incoming nodes in their persisted state.
*
* @param nodes the list of nodes to write
* @param agent the agent causing this change
* @return the nodes in their persisted state
*/
public List writeTo(List nodes, Agent agent, Optional reason) {
if (nodes.isEmpty()) return List.of();
List writtenNodes = new ArrayList<>(nodes.size());
try (NestedTransaction nestedTransaction = new NestedTransaction()) {
Map> nodesByState = nodes.stream().collect(Collectors.groupingBy(Node::state));
for (Map.Entry> entry : nodesByState.entrySet()) {
writtenNodes.addAll(writeTo(entry.getKey(), entry.getValue(), agent, reason, nestedTransaction));
}
nestedTransaction.commit();
}
return writtenNodes;
}
/**
* Writes the given nodes to the given state (whether they are already in this state or another),
* and returns a copy of the incoming nodes in their persisted state.
*
* @param toState the state to write the nodes to
* @param nodes the list of nodes to write
* @param agent the agent causing this change
* @return the nodes in their persisted state
*/
public List writeTo(Node.State toState, List nodes,
Agent agent, Optional reason) {
try (NestedTransaction nestedTransaction = new NestedTransaction()) {
List writtenNodes = writeTo(toState, nodes, agent, reason, nestedTransaction);
nestedTransaction.commit();
return writtenNodes;
}
}
public Node writeTo(Node.State toState, Node node, Agent agent, Optional reason) {
return writeTo(toState, List.of(node), agent, reason).get(0);
}
/**
* Adds to the given transaction operations to write the given nodes to the given state,
* and returns a copy of the nodes in the state they will have if the transaction is committed.
*
* @param toState the state to write the nodes to
* @param nodes the list of nodes to write
* @param agent the agent causing this change
* @param reason an optional reason to be logged, for humans
* @param transaction the transaction to which write operations are added by this
* @return the nodes in their state as it will be written if committed
*/
public List writeTo(Node.State toState, List nodes,
Agent agent, Optional reason,
ApplicationTransaction transaction) {
return writeTo(toState, nodes, agent, reason, transaction.nested());
}
public List writeTo(Node.State toState, List nodes,
Agent agent, Optional reason,
NestedTransaction transaction) {
if (nodes.isEmpty()) return nodes;
List writtenNodes = new ArrayList<>(nodes.size());
CuratorTransaction curatorTransaction = db.newCuratorTransactionIn(transaction);
for (Node node : nodes) {
Node newNode = new Node(node.id(), node.extraId(), node.ipConfig(), node.hostname(),
node.parentHostname(), node.flavor(),
newNodeStatus(node, toState),
toState,
toState.isAllocated() ? node.allocation() : Optional.empty(),
node.history().recordStateTransition(node.state(), toState, agent, clock.instant()),
node.type(), node.reports(), node.modelName(), node.reservedTo(),
node.exclusiveToApplicationId(), node.provisionedForApplicationId(), node.hostTTL(), node.hostEmptyAt(),
node.exclusiveToClusterType(), node.switchHostname(), node.trustedCertificates(),
node.cloudAccount(), node.wireguardPubKey());
curatorTransaction.add(createOrSet(nodePath(newNode), nodeSerializer.toJson(newNode)));
writtenNodes.add(newNode);
}
transaction.onCommitted(() -> { // schedule logging on commit of nodes which changed state
for (Node node : nodes) {
if (toState != node.state())
log.log(Level.INFO, agent + " moved " + node + " to " + toState + reason.map(s -> ": " + s).orElse(""));
}
});
return writtenNodes;
}
private Status newNodeStatus(Node node, Node.State toState) {
if (node.state() != Node.State.failed && toState == Node.State.failed) return node.status().withIncreasedFailCount();
if (node.state() == Node.State.failed && toState == Node.State.active) return node.status().withDecreasedFailCount(); // fail undo
return node.status();
}
/** Returns all existing nodes */
public List readNodes() {
CachingCurator.Session session = db.getSession();
return session.getChildren(nodesPath).stream()
.flatMap(hostname -> readNode(session, hostname).stream())
.toList();
}
private Optional readNode(CachingCurator.Session session, String hostname) {
Path path = nodePath(hostname);
return session.getStat(path)
.map(stat -> {
Pair cached = cachedNodes.getIfPresent(path);
if (cached != null && cached.getFirst().equals(stat)) return cached.getSecond();
cachedNodes.invalidate(path);
Optional node = session.getData(path).filter(data -> data.length > 0).map(nodeSerializer::fromJson);
if (node.isEmpty()) return null;
cachedNodes.put(path, new Pair<>(stat, node.get()));
return node.get();
});
}
/** Read node with given hostname, if any such node exists */
public Optional readNode(String hostname) {
return readNode(db.getSession(), hostname);
}
private Path nodePath(Node node) {
return nodePath(node.hostname());
}
private Path nodePath(String hostname) {
return nodesPath.append(hostname);
}
/** Creates and returns the path to the lock for this application */
private Path lockPath(ApplicationId application) {
Path lockPath = CuratorDb.lockPath.append(application.tenant().value())
.append(application.application().value())
.append(application.instance().value());
db.create(lockPath);
return lockPath;
}
/** Acquires the single cluster-global, reentrant lock for all non-active nodes */
public Lock lockInactive() {
return lockInactive(defaultLockTimeout);
}
/** Acquires the single cluster-global, reentrant lock for all non-active nodes */
public Lock lockInactive(Duration timeout) {
return db.lock(lockPath.append("unallocatedLock"), timeout);
}
/** Acquires the single cluster-global, reentrant lock for active nodes of this application */
public Lock lock(ApplicationId application) {
return lock(application, defaultLockTimeout);
}
/** Acquires the single cluster-global, reentrant lock with the specified timeout for active nodes of this application */
public Lock lock(ApplicationId application, Duration timeout) {
try {
return db.lock(lockPath(application), timeout);
}
catch (UncheckedTimeoutException e) {
throw new ApplicationLockException(e);
}
}
// Applications -----------------------------------------------------------
public List readApplicationIds() {
return db.getChildren(applicationsPath).stream()
.map(ApplicationId::fromSerializedForm)
.toList();
}
public Optional readApplication(ApplicationId id) {
return read(applicationPath(id), ApplicationSerializer::fromJson);
}
public void writeApplication(Application application, NestedTransaction transaction) {
db.newCuratorTransactionIn(transaction)
.add(createOrSet(applicationPath(application.id()),
ApplicationSerializer.toJson(application)));
}
public void deleteApplication(ApplicationTransaction transaction) {
if (db.exists(applicationPath(transaction.application())))
db.newCuratorTransactionIn(transaction.nested())
.add(CuratorOperations.delete(applicationPath(transaction.application()).getAbsolute()));
}
private Path applicationPath(ApplicationId id) {
return applicationsPath.append(id.serializedForm());
}
// Maintenance jobs -----------------------------------------------------------
public Lock lockMaintenanceJob(String jobName) {
return db.lock(lockPath.append("maintenanceJobLocks").append(jobName), defaultLockTimeout);
}
// Infrastructure versions -----------------------------------------------------------
public Map readInfrastructureVersions() {
return read(infrastructureVersionsPath, NodeTypeVersionsSerializer::fromJson).orElseGet(TreeMap::new);
}
public void writeInfrastructureVersions(Map infrastructureVersions) {
NestedTransaction transaction = new NestedTransaction();
CuratorTransaction curatorTransaction = db.newCuratorTransactionIn(transaction);
curatorTransaction.add(CuratorOperations.setData(infrastructureVersionsPath.getAbsolute(),
NodeTypeVersionsSerializer.toJson(infrastructureVersions)));
transaction.commit();
}
public Lock lockInfrastructureVersions() {
return db.lock(lockPath.append("infrastructureVersionsLock"), defaultLockTimeout);
}
// OS versions -----------------------------------------------------------
public OsVersionChange readOsVersionChange() {
return read(osVersionsPath, OsVersionChangeSerializer::fromJson).orElse(OsVersionChange.NONE);
}
public void writeOsVersionChange(OsVersionChange change) {
NestedTransaction transaction = new NestedTransaction();
CuratorTransaction curatorTransaction = db.newCuratorTransactionIn(transaction);
curatorTransaction.add(CuratorOperations.setData(osVersionsPath.getAbsolute(),
OsVersionChangeSerializer.toJson(change)));
transaction.commit();
}
public Lock lockOsVersionChange() {
return db.lock(lockPath.append("osVersionsLock"), defaultLockTimeout);
}
// Firmware checks -----------------------------------------------------------
/** Stores the instant after which a firmware check is required, or clears any outstanding ones if empty is given. */
public void writeFirmwareCheck(Optional after) {
byte[] data = after.map(instant -> Long.toString(instant.toEpochMilli()).getBytes())
.orElse(new byte[0]);
NestedTransaction transaction = new NestedTransaction();
CuratorTransaction curatorTransaction = db.newCuratorTransactionIn(transaction);
curatorTransaction.add(CuratorOperations.setData(firmwareCheckPath.getAbsolute(), data));
transaction.commit();
}
/** Returns the instant after which a firmware check is required, if any. */
public Optional readFirmwareCheck() {
return read(firmwareCheckPath, data -> Instant.ofEpochMilli(Long.parseLong(new String(data))));
}
// Archive URIs -----------------------------------------------------------
public void writeArchiveUris(ArchiveUris archiveUris) {
byte[] data = ArchiveUriSerializer.toJson(archiveUris);
NestedTransaction transaction = new NestedTransaction();
CuratorTransaction curatorTransaction = db.newCuratorTransactionIn(transaction);
curatorTransaction.add(CuratorOperations.setData(archiveUrisPath.getAbsolute(), data));
transaction.commit();
}
public ArchiveUris readArchiveUris() {
return read(archiveUrisPath, ArchiveUriSerializer::fromJson).orElseGet(() -> new ArchiveUris(Map.of(), Map.of()));
}
public Lock lockArchiveUris() {
return db.lock(lockPath.append("archiveUris"), defaultLockTimeout);
}
public Lock lockMaintenance(ApplicationId application) {
return db.lock(lockPath.append("maintenanceDeployment").append(application.serializedForm()),
Duration.ofSeconds(3));
}
// Load balancers -----------------------------------------------------------
public List readLoadBalancerIds() {
return readLoadBalancerIds((ignored) -> true);
}
public Map readLoadBalancers(Predicate filter) {
return readLoadBalancerIds(filter).stream()
.map(this::readLoadBalancer)
.filter(Optional::isPresent)
.map(Optional::get)
.collect(collectingAndThen(toLinkedMap(LoadBalancer::id,
Function.identity()),
Collections::unmodifiableMap));
}
public Optional readLoadBalancer(LoadBalancerId id) {
return read(loadBalancerPath(id), LoadBalancerSerializer::fromJson);
}
public void writeLoadBalancer(LoadBalancer loadBalancer, LoadBalancer.State fromState) {
NestedTransaction transaction = new NestedTransaction();
writeLoadBalancers(List.of(loadBalancer), fromState, transaction);
transaction.commit();
}
public void writeLoadBalancers(Collection loadBalancers, LoadBalancer.State fromState, NestedTransaction transaction) {
CuratorTransaction curatorTransaction = db.newCuratorTransactionIn(transaction);
loadBalancers.forEach(loadBalancer -> {
curatorTransaction.add(createOrSet(loadBalancerPath(loadBalancer.id()),
LoadBalancerSerializer.toJson(loadBalancer)));
});
transaction.onCommitted(() -> {
for (var lb : loadBalancers) {
if (lb.state() == fromState) continue;
Optional target = lb.instance()
.flatMap(instance -> instance.hostname()
.map(DomainName::value)
.or(() -> Optional.of(Stream.concat(instance.ip4Address().stream(),
instance.ip6Address().stream())
.collect(Collectors.joining(",")))));
if (fromState == null) {
log.log(Level.INFO, () -> "Creating " + lb.id() + target.map(t -> " (" + t + ")").orElse("") +
" in " + lb.state());
} else {
log.log(Level.INFO, () -> "Moving " + lb.id() + target.map(t -> " (" + t + ")").orElse("") +
" from " + fromState +
" to " + lb.state());
}
}
});
}
public void removeLoadBalancer(LoadBalancerId loadBalancer) {
NestedTransaction transaction = new NestedTransaction();
CuratorTransaction curatorTransaction = db.newCuratorTransactionIn(transaction);
curatorTransaction.add(CuratorOperations.delete(loadBalancerPath(loadBalancer).getAbsolute()));
transaction.commit();
}
private Path loadBalancerPath(LoadBalancerId id) {
return loadBalancersPath.append(id.serializedForm());
}
private List readLoadBalancerIds(Predicate predicate) {
return db.getChildren(loadBalancersPath).stream()
.map(LoadBalancerId::fromSerializedForm)
.filter(predicate)
.toList();
}
/** Returns a given number of unique provision indices */
public List readProvisionIndices(int count) {
if (count < 1)
throw new IllegalArgumentException("count must be a positive integer, was " + count);
int firstIndex = (int) provisionIndexCounter.add(count) - count;
return IntStream.range(0, count)
.mapToObj(i -> firstIndex + i)
.toList();
}
public long readLoadBalancerPoolHead() {
return loadBalancerPoolHead.get();
}
public long incrementLoadBalancerPoolHead() {
return loadBalancerPoolHead.add(1);
}
public long readLoadBalancerPoolTail() {
return loadBalancerPoolTail.get();
}
public long incrementLoadBalancerPoolTail() {
return loadBalancerPoolTail.add(1);
}
public CacheStats cacheStats() {
return db.cacheStats();
}
public CacheStats nodeSerializerCacheStats() {
var stats = cachedNodes.stats();
return new CacheStats(stats.hitRate(), stats.evictionCount(), cachedNodes.size());
}
private Optional read(Path path, Function mapper) {
return db.getData(path).filter(data -> data.length > 0).map(mapper);
}
private Transaction.Operation createOrSet(Path path, byte[] data) {
return db.exists(path) ? CuratorOperations.setData(path.getAbsolute(), data)
: CuratorOperations.create(path.getAbsolute(), data);
}
}