prateekm commented on a change in pull request #1163: Transactional State [4/5]: Added new interfaces for TaskRestoreManager and TaskStorageManager URL: https://github.com/apache/samza/pull/1163#discussion_r330677864
########## File path: samza-core/src/main/scala/org/apache/samza/storage/NonTransactionalStateTaskStorageManager.scala ########## @@ -0,0 +1,144 @@ +/* + * 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.samza.storage + +import java.io._ + +import com.google.common.annotations.VisibleForTesting +import com.google.common.collect.ImmutableSet +import org.apache.samza.container.TaskName +import org.apache.samza.job.model.TaskMode +import org.apache.samza.system._ +import org.apache.samza.util.Logging +import org.apache.samza.util.ScalaJavaUtil.JavaOptionals +import org.apache.samza.{Partition, SamzaException} + +import scala.collection.JavaConverters._ + +/** + * Manage all the storage engines for a given task + */ +class NonTransactionalStateTaskStorageManager( + taskName: TaskName, + containerStorageManager: ContainerStorageManager, + storeChangelogs: Map[String, SystemStream] = Map(), + systemAdmins: SystemAdmins, + loggedStoreBaseDir: File = new File(System.getProperty("user.dir"), "state"), + partition: Partition) extends Logging with TaskStorageManager { + + private val storageManagerUtil = new StorageManagerUtil + private val persistedStores = containerStorageManager.getAllStores(taskName).asScala + .filter { case (storeName, storageEngine) => storageEngine.getStoreProperties.isPersistedToDisk } + + def getStore(storeName: String): Option[StorageEngine] = JavaOptionals.toRichOptional(containerStorageManager.getStore(taskName, storeName)).toOption + + def flush(): Map[SystemStreamPartition, Option[String]] = { + debug("Flushing stores.") + containerStorageManager.getAllStores(taskName).asScala.values.foreach(_.flush) + val newestChangelogSSPOffsets = getNewestChangelogSSPOffsets() + writeChangelogOffsetFiles(newestChangelogSSPOffsets) + newestChangelogSSPOffsets Review comment: The checkpointed offset is is the offset to restore _upto_. Starting offset is determined based on the oldest offset in the topic and the persisted offset file in the latest valid store checkpoint (if any). For logged in-memory stores, since there are no store checkpoints, TransactionalStateTaskRestoreManager will restore from oldest to checkpointed offset (line 302 in current impl). These offsets aren't used in existing (non-transactional) restore manager, so will have no impact. Does this make answer your question? ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
