com.yahoo.vespa.hosted.provision.autoscale.QuestMetricsDb Maven / Gradle / Ivy
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Keeps track of node assignment in a multi-application setup.
// 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.autoscale;
import com.yahoo.component.annotation.Inject;
import com.yahoo.collections.ListMap;
import com.yahoo.collections.Pair;
import com.yahoo.component.AbstractComponent;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.io.IOUtils;
import com.yahoo.yolean.concurrent.ConcurrentResourcePool;
import io.questdb.cairo.CairoEngine;
import io.questdb.cairo.CairoException;
import io.questdb.cairo.DefaultCairoConfiguration;
import io.questdb.cairo.TableToken;
import io.questdb.cairo.TableWriter;
import io.questdb.cairo.security.AllowAllSecurityContext;
import io.questdb.cairo.sql.Record;
import io.questdb.cairo.sql.RecordCursor;
import io.questdb.cairo.sql.RecordCursorFactory;
import io.questdb.griffin.CompiledQuery;
import io.questdb.griffin.SqlCompiler;
import io.questdb.griffin.SqlCompilerFactoryImpl;
import io.questdb.griffin.SqlException;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.SqlExecutionContextImpl;
import io.questdb.std.str.Path;
import java.io.File;
import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;
import static com.yahoo.vespa.defaults.Defaults.getDefaults;
/**
* An implementation of the metrics Db backed by Quest:
* This provides local persistent storage of metrics with fast, multi-threaded lookup and write,
* suitable for production.
*
* @author bratseth
*/
public class QuestMetricsDb extends AbstractComponent implements MetricsDb, AutoCloseable {
private static final Logger log = Logger.getLogger(QuestMetricsDb.class.getName());
private final Table nodeTable;
private final Table clusterTable;
private final Clock clock;
private final String dataDir;
private final CairoEngine engine;
private final ConcurrentResourcePool sqlCompilerPool;
private final AtomicBoolean closed = new AtomicBoolean(false);
@Inject
public QuestMetricsDb() {
this(getDefaults().underVespaHome("var/db/vespa/autoscaling"), Clock.systemUTC());
}
public QuestMetricsDb(String dataDir, Clock clock) {
this.clock = clock;
if (dataDir.startsWith(getDefaults().vespaHome())
&& ! new File(getDefaults().vespaHome()).exists())
dataDir = "data"; // We're injected, but not on a node with Vespa installed
// silence Questdb's custom logging system
String logConfig = dataDir + "/quest-log.conf";
IOUtils.createDirectory(logConfig);
IOUtils.writeFile(new File(logConfig), new byte[0]);
System.setProperty("out", logConfig);
this.dataDir = dataDir;
engine = createEngine(dataDir);
sqlCompilerPool = new ConcurrentResourcePool<>(() -> SqlCompilerFactoryImpl.INSTANCE.getInstance(engine()));
nodeTable = new Table(dataDir, "metrics");
clusterTable = new Table(dataDir, "clusterMetrics");
ensureTablesExist();
}
private static CairoEngine createEngine(String dataDir) {
try {
return new CairoEngine(new DefaultCairoConfiguration(dataDir));
}
catch (CairoException e) {
if (e.getMessage().contains("partitions are not ordered")) { // Happens when migrating 6.7 -> 7.3.1
repairTables(dataDir, e, "metrics", "clusterMetrics");
return new CairoEngine(new DefaultCairoConfiguration(dataDir));
}
throw new IllegalStateException("Could not create Quest db in " + dataDir, e);
}
}
private CairoEngine engine() {
if (closed.get())
throw new IllegalStateException("Attempted to access QuestDb after calling close");
return engine;
}
@Override
public Clock clock() { return clock; }
@Override
public void addNodeMetrics(Collection> snapshots) {
try {
addNodeMetricsBody(snapshots);
}
catch (CairoException e) {
if (e.getMessage().contains("Cannot read offset")) {
// This error seems non-recoverable
nodeTable.repair(e);
addNodeMetricsBody(snapshots);
}
}
}
private void addNodeMetricsBody(Collection> snapshots) {
synchronized (nodeTable.writeLock) {
try (TableWriter writer = nodeTable.getWriter()) {
for (var snapshot : snapshots) {
Optional atMillis = nodeTable.adjustOrDiscard(snapshot.getSecond().at());
if (atMillis.isEmpty()) continue;
TableWriter.Row row = writer.newRow(atMillis.get() * 1000); // in microseconds
row.putStr(0, snapshot.getFirst());
// (1 is timestamp)
row.putFloat(2, (float) snapshot.getSecond().load().cpu());
row.putFloat(3, (float) snapshot.getSecond().load().memory());
row.putFloat(4, (float) snapshot.getSecond().load().disk());
row.putLong(5, snapshot.getSecond().generation());
row.putBool(6, snapshot.getSecond().inService());
row.putBool(7, snapshot.getSecond().stable());
row.putFloat(8, (float) snapshot.getSecond().queryRate());
row.putFloat(9, (float) snapshot.getSecond().load().gpu());
row.putFloat(10, (float) snapshot.getSecond().load().gpuMemory());
row.append();
}
writer.commit();
}
}
}
@Override
public void addClusterMetrics(ApplicationId application, Map snapshots) {
try {
addClusterMetricsBody(application, snapshots);
}
catch (CairoException e) {
if (e.getMessage().contains("Cannot read offset")) {
// This error seems non-recoverable
clusterTable.repair(e);
addClusterMetricsBody(application, snapshots);
}
}
}
private void addClusterMetricsBody(ApplicationId applicationId, Map snapshots) {
synchronized (clusterTable.writeLock) {
try (TableWriter writer = clusterTable.getWriter()) {
for (var snapshot : snapshots.entrySet()) {
Optional atMillis = clusterTable.adjustOrDiscard(snapshot.getValue().at());
if (atMillis.isEmpty()) continue;
TableWriter.Row row = writer.newRow(atMillis.get() * 1000); // in microseconds
row.putStr(0, applicationId.serializedForm());
row.putStr(1, snapshot.getKey().value());
// (2 is timestamp)
row.putFloat(3, (float) snapshot.getValue().queryRate());
row.putFloat(4, (float) snapshot.getValue().writeRate());
row.append();
}
writer.commit();
}
}
}
@Override
public List getNodeTimeseries(Duration period, Set hostnames) {
try {
var snapshots = getNodeSnapshots(clock.instant().minus(period), hostnames, newContext());
return snapshots.entrySet().stream()
.map(entry -> new NodeTimeseries(entry.getKey(), entry.getValue()))
.toList();
}
catch (SqlException e) {
throw new IllegalStateException("Could not read node timeseries data in Quest stored in " + dataDir, e);
}
}
@Override
public ClusterTimeseries getClusterTimeseries(ApplicationId applicationId, ClusterSpec.Id clusterId) {
try {
return getClusterSnapshots(applicationId, clusterId);
}
catch (SqlException e) {
throw new IllegalStateException("Could not read cluster timeseries data in Quest stored in " + dataDir, e);
}
}
@Override
public void gc() {
nodeTable.gc();
clusterTable.gc();
}
@Override
public void deconstruct() { close(); }
@Override
public void close() {
if (closed.getAndSet(true)) return;
synchronized (nodeTable.writeLock) {
synchronized (clusterTable.writeLock) {
for (SqlCompiler sqlCompiler : sqlCompilerPool)
sqlCompiler.close();
engine.close();
}
}
}
private void ensureTablesExist() {
if (nodeTable.exists())
ensureNodeTableIsUpdated();
else
createNodeTable();
if (clusterTable.exists())
ensureClusterTableIsUpdated();
else
createClusterTable();
}
private void ensureNodeTableIsUpdated() {
try {
// Example: nodeTable.ensureColumnExists("write_rate", "float");
// TODO(mpolden): Remove after January 2024
nodeTable.ensureColumnExists("gpu_util", "float");
nodeTable.ensureColumnExists("gpu_mem_total_util", "float");
} catch (Exception e) {
nodeTable.repair(e);
}
}
private void ensureClusterTableIsUpdated() {
try {
if (0 == engine().getTableStatus(new Path(), clusterTable.token())) {
// Example: clusterTable.ensureColumnExists("write_rate", "float");
}
} catch (Exception e) {
clusterTable.repair(e);
}
}
private void createNodeTable() {
try {
issue("create table " + nodeTable.name +
" (hostname string, at timestamp, cpu_util float, mem_total_util float, disk_util float," +
" application_generation long, inService boolean, stable boolean, queries_rate float," +
" gpu_util float, gpu_mem_total_util float" +
" )" +
" timestamp(at)" +
"PARTITION BY DAY;",
newContext());
// We should do this if we get a version where selecting on strings work embedded, see below
// compiler.compile("alter table " + tableName + " alter column hostname add index", context);
}
catch (SqlException e) {
throw new IllegalStateException("Could not create Quest db table '" + nodeTable.name + "'", e);
}
}
private void createClusterTable() {
try {
issue("create table " + clusterTable.name +
" (application string, cluster string, at timestamp, queries_rate float, write_rate float)" +
" timestamp(at)" +
"PARTITION BY DAY;",
newContext());
// We should do this if we get a version where selecting on strings work embedded, see below
// compiler.compile("alter table " + tableName + " alter column cluster add index", context);
}
catch (SqlException e) {
throw new IllegalStateException("Could not create Quest db table '" + clusterTable.name + "'", e);
}
}
private static String getStr(Record record, int col) {
CharSequence charSequence = record.getStrA(col);
return charSequence != null ? charSequence.toString() : "";
}
private ListMap getNodeSnapshots(Instant startTime,
Set hostnames,
SqlExecutionContext context) throws SqlException {
DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME.withZone(ZoneId.of("UTC"));
String from = formatter.format(startTime).substring(0, 19) + ".000000Z";
String to = formatter.format(clock.instant()).substring(0, 19) + ".000000Z";
String sql = "select * from " + nodeTable.name + " where at between('" + from + "', '" + to + "');";
// WHERE clauses does not work:
// String sql = "select * from " + tableName + " where hostname in('host1', 'host2', 'host3');";
try (RecordCursorFactory factory = issue(sql, context).getRecordCursorFactory()) {
ListMap snapshots = new ListMap<>();
try (RecordCursor cursor = factory.getCursor(context)) {
Record record = cursor.getRecord();
while (cursor.hasNext()) {
String hostname = getStr(record, 0);
if (hostnames.isEmpty() || hostnames.contains(hostname)) {
snapshots.put(hostname,
new NodeMetricSnapshot(Instant.ofEpochMilli(record.getTimestamp(1) / 1000),
new Load(record.getFloat(2),
record.getFloat(3),
record.getFloat(4),
getFloatOrDefault(record, 9, 0),
getFloatOrDefault(record, 10, 0)),
record.getLong(5),
record.getBool(6),
record.getBool(7),
record.getFloat(8)));
}
}
}
return snapshots;
}
}
private float getFloatOrDefault(Record record, int col, float defaultValue) {
float value = record.getFloat(col);
return Float.isNaN(value) ? defaultValue : value;
}
private ClusterTimeseries getClusterSnapshots(ApplicationId application, ClusterSpec.Id cluster) throws SqlException {
String sql = "select * from " + clusterTable.name;
var context = newContext();
try (RecordCursorFactory factory = issue(sql, context).getRecordCursorFactory()) {
List snapshots = new ArrayList<>();
try (RecordCursor cursor = factory.getCursor(context)) {
Record record = cursor.getRecord();
while (cursor.hasNext()) {
String applicationIdString = getStr(record, 0);
if ( ! application.serializedForm().equals(applicationIdString)) continue;
String clusterId = getStr(record, 1);
if (cluster.value().equals(clusterId)) {
snapshots.add(new ClusterMetricSnapshot(Instant.ofEpochMilli(record.getTimestamp(2) / 1000),
record.getFloat(3),
record.getFloat(4)));
}
}
}
return new ClusterTimeseries(cluster, snapshots);
}
}
/** Issues an SQL statement against the QuestDb engine */
private CompiledQuery issue(String sql, SqlExecutionContext context) throws SqlException {
SqlCompiler sqlCompiler = sqlCompilerPool.alloc();
try {
return sqlCompiler.compile(sql, context);
} finally {
sqlCompilerPool.free(sqlCompiler);
}
}
/**
* Issues and wait for an SQL statement to be executed against the QuestDb engine.
* Needs to be done for some queries, e.g. 'alter table' queries, see https://github.com/questdb/questdb/issues/1846
*/
private void issueAsync(String sql, SqlExecutionContext context) throws SqlException {
try (var future = issue(sql, context).execute(null)) {
future.await();
}
}
private SqlExecutionContext newContext() {
CairoEngine engine = engine();
return new SqlExecutionContextImpl(engine, 1)
.with(AllowAllSecurityContext.INSTANCE, null);
}
private static void repairTables(String dataDir, Exception e, String ... tableNames) {
log.log(Level.WARNING, "QuestDb seems corrupted, wiping data and starting over", e);
for (String name : tableNames)
repairTable(dataDir, name);
}
private static void repairTable(String dataDir, String name) {
var dir = new File(dataDir, name);
IOUtils.createDirectory(dir.getPath());
IOUtils.recursiveDeleteDir(dir);
IOUtils.createDirectory(dir.getPath());
}
/** A questDb table */
private class Table {
private final Object writeLock = new Object();
private final String name;
private final File dir;
private long highestTimestampAdded = 0;
Table(String dataDir, String name) {
this.name = name;
this.dir = new File(dataDir, name);
IOUtils.createDirectory(dir.getPath());
// https://stackoverflow.com/questions/67785629/what-does-max-txn-txn-inflight-limit-reached-in-questdb-and-how-to-i-avoid-it
new File(dir + "/_txn_scoreboard").delete();
}
private TableToken token() { return engine().getTableTokenIfExists(name); }
boolean exists() {
TableToken token = engine().getTableTokenIfExists(name);
if (token == null) return false;
return 0 == engine().getTableStatus(new Path(), token);
}
TableWriter getWriter() {
return engine().getWriter(token(), "getWriter");
}
void gc() {
synchronized (writeLock) {
try {
issueAsync("alter table " + name + " drop partition where at < dateadd('d', -4, now());", newContext());
}
catch (Exception e) {
if (e.getMessage().contains("no partitions matched WHERE clause")) return;
log.log(Level.WARNING, "Failed to gc old metrics data in " + dir + " table " + name, e);
}
}
}
/**
* Repairs this db on corruption.
*
* @param e the exception indicating corruption
*/
private void repair(Exception e) {
log.log(Level.WARNING, "QuestDb seems corrupted, wiping data and starting over", e);
repairTable(dataDir, name);
ensureTablesExist();
}
void ensureColumnExists(String column, String columnType) throws SqlException {
if (columnNames().contains(column)) return;
issueAsync("alter table " + name + " add column " + column + " " + columnType, newContext());
}
private Optional adjustOrDiscard(Instant at) {
long timestamp = at.toEpochMilli();
if (timestamp >= highestTimestampAdded) {
highestTimestampAdded = timestamp;
return Optional.of(timestamp);
}
// We cannot add old data to QuestDb, but we want to use all recent information
if (timestamp >= highestTimestampAdded - 60 * 1000) return Optional.of(highestTimestampAdded);
// Too old; discard
return Optional.empty();
}
private List columnNames() throws SqlException {
var context = newContext();
List columns = new ArrayList<>();
try (RecordCursorFactory factory = issue("show columns from " + name, context).getRecordCursorFactory()) {
try (RecordCursor cursor = factory.getCursor(context)) {
Record record = cursor.getRecord();
while (cursor.hasNext()) {
columns.add(getStr(record, 0));
}
}
}
return columns;
}
}
}
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