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author | Hossein Falaki <falaki@gmail.com> | 2013-10-17 22:17:06 -0700 |
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committer | Hossein Falaki <falaki@gmail.com> | 2013-10-17 22:17:06 -0700 |
commit | 843727af99786a45cf29352b4e05df92c6b3b6b9 (patch) | |
tree | 5d56f0e6d755014d375ac5f0bc8bc6d06a6782df /core | |
parent | fc26e5b8320556b9edb93741391b759813b4079b (diff) | |
download | spark-843727af99786a45cf29352b4e05df92c6b3b6b9.tar.gz spark-843727af99786a45cf29352b4e05df92c6b3b6b9.tar.bz2 spark-843727af99786a45cf29352b4e05df92c6b3b6b9.zip |
Added a serializable wrapper for HyperLogLog
Diffstat (limited to 'core')
-rw-r--r-- | core/src/main/scala/org/apache/spark/util/SerializableHyperLogLog.scala | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/core/src/main/scala/org/apache/spark/util/SerializableHyperLogLog.scala b/core/src/main/scala/org/apache/spark/util/SerializableHyperLogLog.scala new file mode 100644 index 0000000000..28a8accb33 --- /dev/null +++ b/core/src/main/scala/org/apache/spark/util/SerializableHyperLogLog.scala @@ -0,0 +1,44 @@ +/* + * 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.util + +import java.io.{ObjectOutputStream, ObjectInputStream} +import com.clearspring.analytics.stream.cardinality.{ICardinality, HyperLogLog} + +/** + * A wrapper around com.clearspring.analytics.stream.cardinality.HyperLogLog that is serializable. + */ +private[spark] +class SerializableHyperLogLog(@transient var value: ICardinality) extends Serializable { + + + def merge(other: SerializableHyperLogLog) = new SerializableHyperLogLog(value.merge(other.value)) + + private def readObject(in: ObjectInputStream) { + val byteLength = in.readInt() + val bytes = new Array[Byte](byteLength) + in.readFully(bytes) + value = HyperLogLog.Builder.build(bytes) + } + + private def writeObject(out: ObjectOutputStream) { + val bytes = value.getBytes() + out.writeInt(bytes.length) + out.write(bytes) + } +} |