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From rxin <>
Subject [GitHub] spark pull request #15089: [SPARK-15621] [SQL] Support spilling for Python U...
Date Thu, 29 Sep 2016 21:38:00 GMT
Github user rxin commented on a diff in the pull request:
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/python/RowQueue.scala
    @@ -0,0 +1,277 @@
    +* 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
    +* 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.python
    +import org.apache.spark.SparkException
    +import org.apache.spark.memory.{MemoryConsumer, TaskMemoryManager}
    +import org.apache.spark.sql.catalyst.expressions.UnsafeRow
    +import org.apache.spark.unsafe.Platform
    +import org.apache.spark.unsafe.memory.MemoryBlock
    + * A RowQueue is an FIFO queue for UnsafeRow.
    + *
    + * This RowQueue is ONLY designed and used for Python UDF, which has only one writer
and only one
    + * reader, the reader ALWAYS ran behind the writer. See the doc of class [[BatchEvalPythonExec]]
    + * on how it works.
    + */
    +private[python] trait RowQueue {
    +  /**
    +   * Add a row to the end of it, returns true iff the row has added into it.
    --- End diff --
    OK i understand this now after reading more code. Regardless it would be great to explain
some of the possible causes when this can return false, e.g. when we run out of buffer space.

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