com.yahoo.vespa.hosted.provision.persistence.CuratorDatabaseClient Maven / Gradle / Ivy
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Keeps track of node assignment in a multi-application setup.
// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.persistence;
import com.google.common.util.concurrent.UncheckedTimeoutException;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.ApplicationLockException;
import com.yahoo.config.provision.Environment;
import com.yahoo.config.provision.NodeFlavors;
import com.yahoo.config.provision.SystemName;
import com.yahoo.config.provision.Zone;
import com.yahoo.log.LogLevel;
import com.yahoo.path.Path;
import com.yahoo.transaction.NestedTransaction;
import com.yahoo.vespa.curator.Curator;
import com.yahoo.vespa.curator.Lock;
import com.yahoo.vespa.curator.transaction.CuratorOperations;
import com.yahoo.vespa.curator.transaction.CuratorTransaction;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.node.Agent;
import com.yahoo.vespa.hosted.provision.node.Status;
import java.nio.charset.StandardCharsets;
import java.time.Clock;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
/**
* Client which reads and writes nodes to a curator database.
* Nodes are stored in files named /provision/v1/[nodestate]/[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 CuratorDatabaseClient {
private static final Logger log = Logger.getLogger(CuratorDatabaseClient.class.getName());
private static final Path root = Path.fromString("/provision/v1");
private static final Duration defaultLockTimeout = Duration.ofMinutes(1);
private final NodeSerializer nodeSerializer;
private final StringSetSerializer stringSetSerializer = new StringSetSerializer();
private final CuratorDatabase curatorDatabase;
private final Clock clock;
private final Zone zone;
public CuratorDatabaseClient(NodeFlavors flavors, Curator curator, Clock clock, Zone zone) {
this.nodeSerializer = new NodeSerializer(flavors);
this.zone = zone;
boolean useCache = zone.system().equals(SystemName.cd);
this.curatorDatabase = new CuratorDatabase(curator, root, useCache);
this.clock = clock;
initZK();
}
private void initZK() {
curatorDatabase.create(root);
for (Node.State state : Node.State.values())
curatorDatabase.create(toPath(state));
curatorDatabase.create(inactiveJobsPath());
}
/**
* Adds a set of nodes. Rollbacks/fails transaction if any node is not in the expected state.
*/
public List addNodesInState(List nodes, Node.State expectedState) {
NestedTransaction transaction = new NestedTransaction();
CuratorTransaction curatorTransaction = curatorDatabase.newCuratorTransactionIn(transaction);
for (Node node : nodes) {
if (node.state() != expectedState)
throw new IllegalArgumentException(node + " is not in the " + node.state() + " state");
node = node.with(node.history().recordStateTransition(null, expectedState, Agent.system, clock.instant()));
curatorTransaction.add(CuratorOperations.create(toPath(node).getAbsolute(), nodeSerializer.toJson(node)));
}
transaction.commit();
for (Node node : nodes)
log.log(LogLevel.INFO, "Added " + node);
return nodes;
}
/**
* Adds a set of nodes in the initial, provisioned state.
*
* @return the given nodes for convenience.
*/
public List addNodes(List nodes) {
return addNodesInState(nodes, Node.State.provisioned);
}
/**
* Removes multiple nodes in a single transaction.
*
* @param nodes list of the nodes to remove
*/
public void removeNodes(List nodes) {
NestedTransaction transaction = new NestedTransaction();
for (Node node : nodes) {
Path path = toPath(node.state(), node.hostname());
CuratorTransaction curatorTransaction = curatorDatabase.newCuratorTransactionIn(transaction);
curatorTransaction.add(CuratorOperations.delete(path.getAbsolute()));
}
transaction.commit();
nodes.forEach(node -> log.log(LogLevel.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 Collections.emptyList();
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 or not 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, Collections.singletonList(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,
NestedTransaction transaction) {
if (nodes.isEmpty()) return nodes;
List writtenNodes = new ArrayList<>(nodes.size());
CuratorTransaction curatorTransaction = curatorDatabase.newCuratorTransactionIn(transaction);
for (Node node : nodes) {
Node newNode = new Node(node.openStackId(), node.ipAddresses(), node.additionalIpAddresses(), 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());
curatorTransaction.add(CuratorOperations.delete(toPath(node).getAbsolute()))
.add(CuratorOperations.create(toPath(toState, newNode.hostname()).getAbsolute(), 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(LogLevel.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
// Increase reboot generation when node is moved to dirty unless quick reuse is prioritized.
// This gets rid of lingering processes, updates OS packages if necessary and tests that reboot succeeds.
if (node.state() != Node.State.dirty && toState == Node.State.dirty && !needsFastNodeReuse(zone))
return node.status().withReboot(node.status().reboot().withIncreasedWanted());
return node.status();
}
/** In automated test environments, nodes need to be reused quickly to achieve fast test turnaronud time */
private boolean needsFastNodeReuse(Zone zone) {
return zone.environment() == Environment.staging || zone.environment() == Environment.test;
}
/**
* Returns all nodes which are in one of the given states.
* If no states are given this returns all nodes.
*/
public List getNodes(Node.State ... states) {
List nodes = new ArrayList<>();
if (states.length == 0)
states = Node.State.values();
for (Node.State state : states) {
for (String hostname : curatorDatabase.getChildren(toPath(state))) {
Optional node = getNode(hostname, state);
if (node.isPresent()) nodes.add(node.get()); // node might disappear between getChildren and getNode
}
}
return nodes;
}
/**
* Returns all nodes allocated to the given application which are in one of the given states
* If no states are given this returns all nodes.
*/
public List getNodes(ApplicationId applicationId, Node.State ... states) {
List nodes = getNodes(states);
nodes.removeIf(node -> ! node.allocation().isPresent() || ! node.allocation().get().owner().equals(applicationId));
return nodes;
}
/**
* Returns a particular node, or empty if this noe is not in any of the given states.
* If no states are given this returns the node if it is present in any state.
*/
public Optional getNode(String hostname, Node.State ... states) {
if (states.length == 0)
states = Node.State.values();
for (Node.State state : states) {
Optional nodeData = curatorDatabase.getData(toPath(state, hostname));
if (nodeData.isPresent())
return nodeData.map((data) -> nodeSerializer.fromJson(state, data));
}
return Optional.empty();
}
private Path toPath(Node.State nodeState) { return root.append(toDir(nodeState)); }
private Path toPath(Node node) {
return root.append(toDir(node.state())).append(node.hostname());
}
private Path toPath(Node.State nodeState, String nodeName) {
return root.append(toDir(nodeState)).append(nodeName);
}
/** Creates an returns the path to the lock for this application */
private Path lockPath(ApplicationId application) {
Path lockPath =
root
.append("locks")
.append(application.tenant().value())
.append(application.application().value())
.append(application.instance().value());
curatorDatabase.create(lockPath);
return lockPath;
}
private String toDir(Node.State state) {
switch (state) {
case active: return "allocated"; // legacy name
case dirty: return "dirty";
case failed: return "failed";
case inactive: return "deallocated"; // legacy name
case parked : return "parked";
case provisioned: return "provisioned";
case ready: return "ready";
case reserved: return "reserved";
default: throw new RuntimeException("Node state " + state + " does not map to a directory name");
}
}
/** Acquires the single cluster-global, reentrant lock for all non-active nodes */
public Lock lockInactive() {
return lock(root.append("locks").append("unallocatedLock"), defaultLockTimeout);
}
/** 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 lock(lockPath(application), timeout);
}
catch (UncheckedTimeoutException e) {
throw new ApplicationLockException(e);
}
}
private Lock lock(Path path, Duration timeout) {
return curatorDatabase.lock(path, timeout);
}
/**
* Returns a default flavor specific for an application, or empty if not available.
*/
public Optional getDefaultFlavorForApplication(ApplicationId applicationId) {
Optional utf8DefaultFlavor = curatorDatabase.getData(defaultFlavorPath(applicationId));
return utf8DefaultFlavor.map((flavor) -> new String(flavor, StandardCharsets.UTF_8));
}
private Path defaultFlavorPath(ApplicationId applicationId) {
return root.append("defaultFlavor").append(applicationId.serializedForm());
}
public Set readInactiveJobs() {
try {
byte[] data = curatorDatabase.getData(inactiveJobsPath()).get();
if (data.length == 0) return new HashSet<>(); // inactive jobs has never been written
return stringSetSerializer.fromJson(data);
}
catch (RuntimeException e) {
log.log(Level.WARNING, "Error reading inactive jobs, deleting inactive state");
writeInactiveJobs(Collections.emptySet());
return new HashSet<>();
}
}
public void writeInactiveJobs(Set inactiveJobs) {
NestedTransaction transaction = new NestedTransaction();
CuratorTransaction curatorTransaction = curatorDatabase.newCuratorTransactionIn(transaction);
curatorTransaction.add(CuratorOperations.setData(inactiveJobsPath().getAbsolute(),
stringSetSerializer.toJson(inactiveJobs)));
transaction.commit();
}
public Lock lockInactiveJobs() {
return lock(root.append("locks").append("inactiveJobsLock"), defaultLockTimeout);
}
private Path inactiveJobsPath() {
return root.append("inactiveJobs");
}
}
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