adarshsanjeev commented on code in PR #14322: URL: https://github.com/apache/druid/pull/14322#discussion_r1298287267
########## extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/SegmentLoadWaiter.java: ########## @@ -0,0 +1,304 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +package org.apache.druid.msq.exec; + +import com.fasterxml.jackson.annotation.JsonCreator; +import com.fasterxml.jackson.annotation.JsonIgnore; +import com.fasterxml.jackson.annotation.JsonInclude; +import com.fasterxml.jackson.annotation.JsonProperty; +import com.fasterxml.jackson.databind.ObjectMapper; +import org.apache.druid.discovery.BrokerClient; +import org.apache.druid.java.util.common.DateTimes; +import org.apache.druid.java.util.common.StringUtils; +import org.apache.druid.java.util.common.logger.Logger; +import org.apache.druid.java.util.http.client.Request; +import org.apache.druid.sql.http.ResultFormat; +import org.apache.druid.sql.http.SqlQuery; +import org.jboss.netty.handler.codec.http.HttpMethod; +import org.joda.time.DateTime; +import org.joda.time.Interval; + +import javax.annotation.Nullable; +import javax.ws.rs.core.MediaType; +import java.util.HashMap; +import java.util.Iterator; +import java.util.Map; +import java.util.Set; +import java.util.TreeSet; +import java.util.concurrent.TimeUnit; + +/** + * Class that periodically checks with the broker if all the segments generated are loaded by querying the sys table + * and blocks till it is complete. This will account for and not wait for segments that would never be loaded due to + * load rules. Should only be called if the query generates new segments or tombstones. + * <br> + * If an exception is thrown during operation, this will simply log the exception and exit without failing the task, + * since the segments have already been published successfully, and should be loaded eventually. + * <br> + * If the segments are not loaded within {@link #TIMEOUT_DURATION_MILLIS} milliseconds, this logs a warning and exits + * for the same reason. + */ +public class SegmentLoadWaiter +{ + private static final Logger log = new Logger(SegmentLoadWaiter.class); + private static final long INITIAL_SLEEP_DURATION_MILLIS = TimeUnit.SECONDS.toMillis(5); + private static final long SLEEP_DURATION_MILLIS = TimeUnit.SECONDS.toMillis(5); + private static final long TIMEOUT_DURATION_MILLIS = TimeUnit.MINUTES.toMillis(10); + private static final String LOAD_QUERY = "SELECT COUNT(*) AS totalSegments,\n" + + "COUNT(*) FILTER (WHERE is_available = 0 AND is_published = 1 AND replication_factor != 0) AS loadingSegments\n" Review Comment: Replication factor is used to filter out cold segments. Even if a cold segment is unavailable, we don't wait for it. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
