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SPARK-1127 Add saveAsHBase to PairRDDFunctions #123
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106 changes: 106 additions & 0 deletions
106
core/src/main/scala/org/apache/spark/SparkHBaseWriter.scala
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| @@ -0,0 +1,106 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.spark | ||
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| import org.apache.hadoop.hbase.client.{Put, HTable} | ||
| import org.apache.hadoop.conf.Configuration | ||
| import org.apache.hadoop.hbase.util.Bytes | ||
| import org.apache.commons.codec.binary.Hex | ||
| import org.apache.hadoop.io.Text | ||
| import org.apache.hadoop.hbase.HConstants | ||
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| /** | ||
| * Internal helper class that saves an RDD using a HBase OutputFormat. This is only public | ||
| * because we need to access this class from the `spark` package to use some package-private HBase | ||
| * functions, but this class should not be used directly by users. | ||
| * | ||
| * Saves the RDD using a JobConf, which should contain an output key class, an output value class, | ||
| * a filename to write to, etc, exactly like in a HBase MapReduce job. | ||
| */ | ||
| private[apache] | ||
| class SparkHBaseWriter(conf: HBaseConf) | ||
| extends Logging { | ||
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| private var htable: HTable = null | ||
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| val zkHost = conf.zkHost | ||
| val zkPort = conf.zkPort | ||
| val zkNode = conf.zkNode | ||
| val table = conf.table | ||
| val rowkeyType = conf.rowkeyType | ||
| val columns = conf.columns | ||
| val delimiter = conf.delimiter | ||
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| def setup() { | ||
| val conf = new Configuration() | ||
| conf.set(HConstants.ZOOKEEPER_QUORUM, zkHost) | ||
| conf.set(HConstants.ZOOKEEPER_CLIENT_PORT, zkPort) | ||
| conf.set(HConstants.ZOOKEEPER_ZNODE_PARENT, zkNode) | ||
| htable = new HTable(conf, table) | ||
| } | ||
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| def toByteArr(field: String, kind: String) = kind match { | ||
| case HBaseType.Boolean => Bytes.toBytes(field.toBoolean) | ||
| case HBaseType.Int => Bytes.toBytes(field.toInt) | ||
| case HBaseType.Long => Bytes.toBytes(field.toLong) | ||
| case HBaseType.Float => Bytes.toBytes(field.toFloat) | ||
| case HBaseType.Double => Bytes.toBytes(field.toDouble) | ||
| case HBaseType.String => Bytes.toBytes(field) | ||
| case HBaseType.Bytes => Hex.decodeHex(field.toCharArray) | ||
| } | ||
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| def parseRecord(record: String) = { | ||
| val fields = record.split(delimiter) | ||
| val put = new Put(toByteArr(fields(0), rowkeyType)) | ||
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| List.range(1, fields.size) foreach { | ||
| i => put.add(columns(i - 1).family, columns(i - 1).qualifier, toByteArr(fields(i), columns(i - 1).typ)) | ||
| } | ||
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| put | ||
| } | ||
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| def write(record: Text) { | ||
| val put = parseRecord(record.toString) | ||
| htable.put(put) | ||
| } | ||
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| def close() { | ||
| htable.close() | ||
| } | ||
| } | ||
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| private[apache] | ||
| object HBaseType { | ||
| val Boolean = "bool" | ||
| val Int = "int" | ||
| val Long = "long" | ||
| val Float = "float" | ||
| val Double = "double" | ||
| val String = "string" | ||
| val Bytes = "bytes" | ||
| } | ||
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| private[apache] | ||
| class HBaseColumn(val family: Array[Byte], val qualifier: Array[Byte], val typ: String) | ||
| extends Serializable | ||
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| private[apache] | ||
| class HBaseConf(val zkHost: String, val zkPort: String, val zkNode: String, | ||
| val table: String, val rowkeyType: String, val columns: List[HBaseColumn], val delimiter: Char) | ||
| extends Serializable |
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Where is writer closed ?
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Sorry, I forgot to add exception handle and close table later. As discussion in SPARK-1127, I would try to provide a higher-level abstraction for this.