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/*
* 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.api.python
import java.io.{File, InputStream, IOException, OutputStream}
import scala.collection.mutable.ArrayBuffer
import org.apache.spark.SparkContext
private[spark] object PythonUtils {
/** Get the PYTHONPATH for PySpark, either from SPARK_HOME, if it is set, or from our JAR */
def sparkPythonPath: String = {
val pythonPath = new ArrayBuffer[String]
for (sparkHome <- sys.env.get("SPARK_HOME")) {
pythonPath += Seq(sparkHome, "python").mkString(File.separator)
pythonPath += Seq(sparkHome, "python", "lib", "py4j-0.8.1-src.zip").mkString(File.separator)
}
pythonPath ++= SparkContext.jarOfObject(this)
pythonPath.mkString(File.pathSeparator)
}
/** Merge PYTHONPATHS with the appropriate separator. Ignores blank strings. */
def mergePythonPaths(paths: String*): String = {
paths.filter(_ != "").mkString(File.pathSeparator)
}
}
/**
* A utility class to redirect the child process's stdout or stderr.
*/
private[spark] class RedirectThread(
in: InputStream,
out: OutputStream,
name: String)
extends Thread(name) {
setDaemon(true)
override def run() {
scala.util.control.Exception.ignoring(classOf[IOException]) {
// FIXME: We copy the stream on the level of bytes to avoid encoding problems.
val buf = new Array[Byte](1024)
var len = in.read(buf)
while (len != -1) {
out.write(buf, 0, len)
out.flush()
len = in.read(buf)
}
}
}
}
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