| package org.apache.samza.storage |
| |
| /* |
| * 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. |
| */ |
| |
| import java.util |
| import java.util.concurrent.CompletableFuture |
| |
| import com.google.common.annotations.VisibleForTesting |
| import com.google.common.collect.ImmutableSet |
| import org.apache.samza.checkpoint.kafka.KafkaStateCheckpointMarker |
| import org.apache.samza.checkpoint.{Checkpoint, CheckpointId} |
| import org.apache.samza.container.TaskName |
| import org.apache.samza.system._ |
| import org.apache.samza.util.Logging |
| import org.apache.samza.{Partition, SamzaException} |
| |
| import scala.collection.JavaConverters._ |
| |
| /** |
| * Manage all the storage engines for a given task |
| */ |
| class KafkaTransactionalStateTaskBackupManager( |
| taskName: TaskName, |
| storeChangelogs: util.Map[String, SystemStream] = new util.HashMap[String, SystemStream](), |
| systemAdmins: SystemAdmins, |
| partition: Partition) extends Logging with TaskBackupManager { |
| |
| override def init(checkpoint: Checkpoint): Unit = {} |
| |
| override def snapshot(checkpointId: CheckpointId): util.Map[String, String] = { |
| debug("Getting newest offsets for kafka changelog SSPs.") |
| getNewestChangelogSSPOffsets(taskName, storeChangelogs, partition, systemAdmins) |
| } |
| |
| override def upload(checkpointId: CheckpointId, snapshotCheckpointsMap: util.Map[String, String]): |
| CompletableFuture[util.Map[String, String]] = { |
| CompletableFuture.completedFuture(snapshotCheckpointsMap) |
| } |
| |
| override def cleanUp(checkpointId: CheckpointId, |
| stateCheckpointMarker: util.Map[String, String]): CompletableFuture[Void] = { |
| CompletableFuture.completedFuture(null) |
| } |
| |
| override def close() {} |
| |
| /** |
| * Returns the newest offset for each store changelog SSP for this task. Returned map will |
| * always contain an entry for every changelog SSP. |
| * @return A map of storenames for this task to their ssp and newest offset (null if empty) wrapped in KafkaStateCheckpointMarker |
| * @throws SamzaException if there was an error fetching newest offset for any SSP |
| */ |
| @VisibleForTesting |
| def getNewestChangelogSSPOffsets(taskName: TaskName, storeChangelogs: util.Map[String, SystemStream], |
| partition: Partition, systemAdmins: SystemAdmins): util.Map[String, String] = { |
| storeChangelogs.asScala |
| .map { case (storeName, systemStream) => { |
| try { |
| debug("Fetching newest offset for taskName %s store %s changelog %s" format (taskName, storeName, systemStream)) |
| val ssp = new SystemStreamPartition(systemStream.getSystem, systemStream.getStream, partition) |
| val systemAdmin = systemAdmins.getSystemAdmin(systemStream.getSystem) |
| |
| val sspMetadata = Option(systemAdmin.getSSPMetadata(ImmutableSet.of(ssp)).get(ssp)) |
| .getOrElse(throw new SamzaException("Received null metadata for ssp: %s" format ssp)) |
| |
| // newest offset == null implies topic is empty |
| val newestOffsetOption = Option(sspMetadata.getNewestOffset) |
| newestOffsetOption.foreach(newestOffset => |
| debug("Got newest offset %s for taskName %s store %s changelog %s" format(newestOffset, taskName, storeName, systemStream))) |
| |
| (storeName, KafkaStateCheckpointMarker.serialize(new KafkaStateCheckpointMarker(ssp, newestOffsetOption.orNull))) |
| } catch { |
| case e: Exception => |
| throw new SamzaException("Error getting newest changelog offset for taskName %s store %s changelog %s." |
| format(taskName, storeName, systemStream), e) |
| } |
| }} |
| .toMap.asJava |
| } |
| } |