Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1648#issuecomment-51140783
It looks like deserializing the JobConf could be pretty expensive. Here's
part of the deserialization stack trace:
```java
Executor task launch worker-0 [RUNNABLE]
java.util.zip.ZipFile.getEntry(long, byte[], boolean)
java.util.zip.ZipFile.getEntry(String)
java.util.jar.JarFile.getEntry(String)
java.util.jar.JarFile.getJarEntry(String)
sun.misc.URLClassPath$JarLoader.getResource(String, boolean)
sun.misc.URLClassPath$JarLoader.findResource(String, boolean)
sun.misc.URLClassPath.findResource(String, boolean)
java.net.URLClassLoader$2.run()<2 recursive calls>
java.security.AccessController.doPrivileged(PrivilegedAction,
AccessControlContext)
java.net.URLClassLoader.findResource(String)
java.lang.ClassLoader.getResource(String)<2 recursive calls>
java.net.URLClassLoader.getResourceAsStream(String)
javax.xml.parsers.SecuritySupport$4.run()
java.security.AccessController.doPrivileged(PrivilegedAction)
javax.xml.parsers.SecuritySupport.getResourceAsStream(ClassLoader, String)
javax.xml.parsers.FactoryFinder.findJarServiceProvider(String)
javax.xml.parsers.FactoryFinder.find(String, String)
javax.xml.parsers.DocumentBuilderFactory.newInstance()
org.apache.hadoop.conf.Configuration.loadResource(Properties, Object,
boolean)
org.apache.hadoop.conf.Configuration.loadResources(Properties, ArrayList,
boolean)
org.apache.hadoop.conf.Configuration.getProps()
org.apache.hadoop.conf.Configuration.get(String, String)
org.apache.hadoop.hive.conf.HiveConf.initialize(Class)
org.apache.hadoop.hive.conf.HiveConf.<init>()
sun.reflect.GeneratedConstructorAccessor142.newInstance(Object[])
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Object[])
java.lang.reflect.Constructor.newInstance(Object[])
org.apache.hadoop.util.ReflectionUtils.newInstance(Class, Configuration)
org.apache.hadoop.io.WritableFactories.newInstance(Class, Configuration)
org.apache.hadoop.io.ObjectWritable.readObject(DataInput, ObjectWritable,
Configuration)
org.apache.hadoop.io.ObjectWritable.readFields(DataInput)
org.apache.spark.SerializableWritable.readObject(ObjectInputStream)
[...]
org.apache.spark.serializer.JavaDeserializationStream.readObject(ClassTag)
org.apache.spark.serializer.JavaSerializerInstance.deserialize(ByteBuffer,
ClassLoader, ClassTag)
org.apache.spark.scheduler.ResultTask.runTask(TaskContext)
org.apache.spark.scheduler.Task.run(long)
org.apache.spark.executor.Executor$TaskRunner.run()
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker)
java.util.concurrent.ThreadPoolExecutor$Worker.run()
java.lang.Thread.run()
```
This seems to involve fairly expensive searches of the classpath.
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