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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.reindexing;
import ai.vespa.reindexing.Reindexing.Status;
import ai.vespa.reindexing.Reindexing.Trigger;
import com.yahoo.concurrent.UncheckedTimeoutException;
import com.yahoo.document.DocumentTypeManager;
import com.yahoo.path.Path;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.Slime;
import com.yahoo.slime.SlimeUtils;
import com.yahoo.vespa.curator.Curator;
import com.yahoo.vespa.curator.Lock;
import com.yahoo.yolean.Exceptions;
import java.io.Closeable;
import java.time.Duration;
import java.time.Instant;
import java.util.List;
import java.util.function.Function;
import java.util.logging.Level;
import java.util.logging.Logger;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.toUnmodifiableMap;
/**
* Reads and writes status of initiated reindexing jobs.
*
* @author jonmv
*/
public class ReindexingCurator implements Closeable {
private static final Logger log = Logger.getLogger(ReindexingCurator.class.getName());
private final Curator curator;
private final ReindexingSerializer serializer;
private final Duration lockTimeout;
public ReindexingCurator(Curator curator, DocumentTypeManager manager) {
this(curator, manager, Duration.ofSeconds(1));
}
ReindexingCurator(Curator curator, DocumentTypeManager manager, Duration lockTimeout) {
this.curator = curator;
this.serializer = new ReindexingSerializer(manager);
this.lockTimeout = lockTimeout;
}
/** If no reindexing data exists (has been wiped), assume current ready documents are already done. */
public void initializeIfEmpty(String cluster, List<Trigger> ready, Instant now) {
if ( ! curator.exists(statusPath(cluster))) {
try (Lock lock = lockReindexing(cluster)) {
if (curator.exists(statusPath(cluster)))
return; // Some other node already did this.
Reindexing reindexing = Reindexing.empty();
for (Trigger trigger : ready)
if (trigger.readyAt().isBefore(now))
reindexing = reindexing.with(trigger.type(), Status.ready(now).running().successful(now));
log.log(Level.INFO, "Creating initial reindexing status at '" + statusPath(cluster) + "'");
writeReindexing(reindexing, cluster);
}
catch (ReindexingLockException ignored) {
// Some other node took ownership and is doing this.
}
}
}
public Reindexing readReindexing(String cluster) {
Reindexing reindexing = curator.getData(statusPath(cluster)).map(serializer::deserialize)
.orElse(Reindexing.empty());
log.log(Level.FINE, () -> "Read reindexing status '" + reindexing + "' from '" + statusPath(cluster) + "'");
return reindexing;
}
public void writeReindexing(Reindexing reindexing, String cluster) {
log.log(Level.FINE, () -> "Writing reindexing status '" + reindexing + "' to '" + statusPath(cluster) + "'");
curator.set(statusPath(cluster), serializer.serialize(reindexing));
}
/** This lock must be held to manipulate reindexing state, or by whoever has a running visitor. */
public Lock lockReindexing(String cluster) throws ReindexingLockException {
try {
return curator.lock(lockPath(cluster), lockTimeout);
}
catch (UncheckedTimeoutException e) {
throw new ReindexingLockException(e);
}
}
private Path rootPath(String clusterName) { return Path.fromString("/reindexing/v1/" + clusterName); }
private Path statusPath(String clusterName) { return rootPath(clusterName).append("status"); }
private Path lockPath(String clusterName) { return rootPath(clusterName).append("lock"); }
@Override
public void close() {
curator.close();
}
private static class ReindexingSerializer {
private static final String STATUS = "status";
private static final String TYPE = "type";
private static final String STARTED_MILLIS = "startedMillis";
private static final String ENDED_MILLIS = "endedMillis";
private static final String PROGRESS = "progress";
private static final String STATE = "state";
private static final String MESSAGE = "message";
private final DocumentTypeManager types;
public ReindexingSerializer(DocumentTypeManager types) {
this.types = types;
}
private byte[] serialize(Reindexing reindexing) {
Cursor root = new Slime().setObject();
Cursor statusArray = root.setArray(STATUS);
reindexing.status().forEach((type, status) -> {
Cursor statusObject = statusArray.addObject();
statusObject.setString(TYPE, type.getName());
statusObject.setLong(STARTED_MILLIS, status.startedAt().toEpochMilli());
status.endedAt().ifPresent(endedAt -> statusObject.setLong(ENDED_MILLIS, endedAt.toEpochMilli()));
status.progress().ifPresent(progress -> statusObject.setString(PROGRESS, progress.serializeToString()));
statusObject.setString(STATE, toString(status.state()));
status.message().ifPresent(message -> statusObject.setString(MESSAGE, message));
});
return Exceptions.uncheck(() -> SlimeUtils.toJsonBytes(root));
}
private Reindexing deserialize(byte[] json) {
return new Reindexing(SlimeUtils.entriesStream(SlimeUtils.jsonToSlimeOrThrow(json).get().field(STATUS))
.filter(object -> require(TYPE, object, field -> types.hasDocumentType(field.asString()))) // Forget unknown documents.
.collect(toUnmodifiableMap(object -> require(TYPE, object, field -> types.getDocumentType(field.asString())),
object -> new Status(require(STARTED_MILLIS, object, field -> Instant.ofEpochMilli(field.asLong())),
get(ENDED_MILLIS, object, field -> Instant.ofEpochMilli(field.asLong())),
get(PROGRESS, object, field -> field.asString()),
require(STATE, object, field -> toState(field.asString())),
get(MESSAGE, object, field -> field.asString())))));
}
private static <T> T get(String name, Inspector object, Function<Inspector, T> mapper) {
return object.field(name).valid() ? mapper.apply(object.field(name)) : null;
}
private static <T> T require(String name, Inspector object, Function<Inspector, T> mapper) {
return requireNonNull(get(name, object, mapper));
}
private static String toString(Reindexing.State state) {
switch (state) {
case READY: return "ready";
case RUNNING: return "running";
case SUCCESSFUL: return "successful";
case FAILED: return "failed";
default: throw new IllegalArgumentException("Unexpected state '" + state + "'");
}
}
private static Reindexing.State toState(String value) {
switch (value) {
case "ready": return Reindexing.State.READY;
case "running": return Reindexing.State.RUNNING;
case "successful": return Reindexing.State.SUCCESSFUL;
case "failed": return Reindexing.State.FAILED;
default: throw new IllegalArgumentException("Unknown state '" + value + "'");
}
}
}
/** Indicates that taking the reindexing lock failed within the allotted time. */
static class ReindexingLockException extends Exception {
ReindexingLockException(UncheckedTimeoutException cause) {
super("Failed to obtain the reindexing lock", cause);
}
}
}
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