samza-kv-rocksdb/src/main/scala/org/apache/samza/storage/kv/RocksDbKeyValueStorageEngineFactory.scala

/*
 * Licensed to the Apache Software Foundation (ASF) under one
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 * 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,
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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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 * specific language governing permissions and limitations
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package org.apache.samza.storage.kv

import java.io.File
import org.apache.samza.container.SamzaContainerContext
import org.apache.samza.metrics.MetricsRegistry
import org.apache.samza.storage.kv._
import org.apache.samza.system.SystemStreamPartition
import org.rocksdb.WriteOptions

class RocksDbKeyValueStorageEngineFactory [K, V] extends BaseKeyValueStorageEngineFactory[K, V]
{
  /**
   * Return a KeyValueStore instance for the given store name
   * @param storeName Name of the store
   * @param storeDir The directory of the store
   * @param registry MetricsRegistry to which to publish store specific metrics.
   * @param changeLogSystemStreamPartition Samza stream partition from which to receive the changelog.
   * @param containerContext Information about the container in which the task is executing.
   * @return A valid KeyValueStore instance
   */
  override def getKVStore(storeName: String,
                          storeDir: File,
                          registry: MetricsRegistry,
                          changeLogSystemStreamPartition: SystemStreamPartition,
                          containerContext: SamzaContainerContext): KeyValueStore[Array[Byte], Array[Byte]] = {
    val storageConfig = containerContext.config.subset("stores." + storeName + ".", true)
    val rocksDbMetrics = new KeyValueStoreMetrics(storeName, registry)
    val rocksDbOptions = RocksDbKeyValueStore.options(storageConfig, containerContext)
    val rocksDbWriteOptions = new WriteOptions().setDisableWAL(true)
    val rocksDb = new RocksDbKeyValueStore(storeDir, rocksDbOptions, rocksDbWriteOptions, rocksDbMetrics)
    rocksDb
  }
}