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From pwendell <>
Subject [GitHub] incubator-spark pull request: Patch for SPARK-942
Date Tue, 25 Feb 2014 01:26:29 GMT
Github user pwendell commented on a diff in the pull request:
    --- Diff: core/src/main/scala/org/apache/spark/serializer/JavaSerializer.scala ---
    @@ -25,7 +25,22 @@ import org.apache.spark.SparkConf
     private[spark] class JavaSerializationStream(out: OutputStream) extends SerializationStream
       val objOut = new ObjectOutputStream(out)
    -  def writeObject[T](t: T): SerializationStream = { objOut.writeObject(t); this }
    +  var counter = 0;
    +  /* Calling reset to avoid memory leak:
    +   *
    +   * But only call it every 1000th time to avoid bloated serialization streams (when
    +   * the stream 'resets' object class descriptions have to be re-written)  
    +   */
    +  def writeObject[T](t: T): SerializationStream = {
    +    objOut.writeObject(t);
    +    if (counter >= 1000) {
    --- End diff --
    It's funny we had the same problem earlier in Spark and I looked for a long time and was
convinced this reset() thing didn't work this way. We ended up solving it another way. But
after reading the OOS source code (again) it looks like this is what we want. Good catch.

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