HeartSaVioR commented on code in PR #43425: URL: https://github.com/apache/spark/pull/43425#discussion_r1388798323
########## sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/state/StateDataSource.scala: ########## @@ -0,0 +1,216 @@ +/* + * 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.spark.sql.execution.datasources.v2.state + +import java.util +import java.util.UUID + +import scala.util.control.NonFatal + +import org.apache.hadoop.conf.Configuration +import org.apache.hadoop.fs.Path + +import org.apache.spark.sql.{RuntimeConfig, SparkSession} +import org.apache.spark.sql.connector.catalog.{Table, TableProvider} +import org.apache.spark.sql.connector.expressions.Transform +import org.apache.spark.sql.execution.datasources.v2.state.StateDataSource.JoinSideValues.JoinSideValues +import org.apache.spark.sql.execution.streaming.{CommitLog, OffsetSeqLog, OffsetSeqMetadata} +import org.apache.spark.sql.execution.streaming.StreamingSymmetricHashJoinHelper.{LeftSide, RightSide} +import org.apache.spark.sql.execution.streaming.state.{StateSchemaCompatibilityChecker, StateStore, StateStoreConf, StateStoreId, StateStoreProviderId} +import org.apache.spark.sql.sources.DataSourceRegister +import org.apache.spark.sql.types.StructType +import org.apache.spark.sql.util.CaseInsensitiveStringMap + +/** + * An implementation of [[TableProvider]] with [[DataSourceRegister]] for State Store data source. + */ +class StateDataSource extends TableProvider with DataSourceRegister { + import StateDataSource._ + + private lazy val session: SparkSession = SparkSession.active + + private lazy val hadoopConf: Configuration = session.sessionState.newHadoopConf() + + override def shortName(): String = "statestore" + + override def getTable( + schema: StructType, + partitioning: Array[Transform], + properties: util.Map[String, String]): Table = { + val sourceOptions = StateSourceOptions.apply(session, hadoopConf, properties) + val stateConf = buildStateStoreConf(sourceOptions.resolvedCpLocation, sourceOptions.batchId) + new StateTable(session, schema, sourceOptions, stateConf) + } + + override def inferSchema(options: CaseInsensitiveStringMap): StructType = { + val partitionId = StateStore.PARTITION_ID_TO_CHECK_SCHEMA + val sourceOptions = StateSourceOptions.apply(session, hadoopConf, options) + if (sourceOptions.joinSide != JoinSideValues.none && + sourceOptions.storeName != StateStoreId.DEFAULT_STORE_NAME) { + throw new IllegalArgumentException(s"The options '$PARAM_JOIN_SIDE' and " + + s"'$PARAM_STORE_NAME' cannot be specified together. Please specify either one.") + } + + val stateCheckpointLocation = sourceOptions.stateCheckpointLocation + + try { + val (keySchema, valueSchema) = sourceOptions.joinSide match { + case JoinSideValues.left => + StreamStreamJoinStateHelper.readKeyValueSchema(session, stateCheckpointLocation.toString, + sourceOptions.operatorId, LeftSide) + + case JoinSideValues.right => + StreamStreamJoinStateHelper.readKeyValueSchema(session, stateCheckpointLocation.toString, + sourceOptions.operatorId, RightSide) + + case JoinSideValues.none => + val storeId = new StateStoreId(stateCheckpointLocation.toString, sourceOptions.operatorId, + partitionId, sourceOptions.storeName) + val providerId = new StateStoreProviderId(storeId, UUID.randomUUID()) + val manager = new StateSchemaCompatibilityChecker(providerId, hadoopConf) + manager.readSchemaFile() + } + + new StructType() + .add("key", keySchema) + .add("value", valueSchema) + } catch { + case NonFatal(e) => + throw new IllegalArgumentException("Failed to read the state schema. Either the file " + + s"does not exist, or the file is corrupted. options: $sourceOptions", e) + } + } + + private def buildStateStoreConf(checkpointLocation: String, batchId: Long): StateStoreConf = { + val offsetLog = new OffsetSeqLog(session, new Path(checkpointLocation, "offsets").toString) + offsetLog.get(batchId) match { + case Some(value) => + val metadata = value.metadata.getOrElse( + throw new IllegalStateException(s"Metadata is not available for offset log for " + + s"$batchId, checkpoint location $checkpointLocation") + ) + + val clonedRuntimeConf = new RuntimeConfig(session.sessionState.conf.clone()) + OffsetSeqMetadata.setSessionConf(metadata, clonedRuntimeConf) + StateStoreConf(clonedRuntimeConf.sqlConf) + + case _ => + throw new IllegalStateException(s"The offset log for $batchId does not exist, " + + s"checkpoint location $checkpointLocation") + } + } + + override def supportsExternalMetadata(): Boolean = false +} + +object StateDataSource { + val PARAM_PATH = "path" Review Comment: This is actually for better UX, you pass the checkpoint path in load() and it works smoothly. -- This is an automated message from the Apache Git Service. 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