GitHub user witgo opened a pull request:
https://github.com/apache/spark/pull/15505
[WIP][SPARK-17931]taskScheduler has some unneeded serialization
## What changes were proposed in this pull request?
When taskScheduler instantiates TaskDescription, it calls
`Task.serializeWithDependencies(task, sched.sc.addedFiles, sched.sc.addedJars,
ser)`. It serializes task and its dependency.
But after SPARK-2521 has been merged into the master, the ResultTask class
and ShuffleMapTask class no longer contain rdd and closure objects.
TaskDescription class can be changed as below:
```scala
class TaskDescription(
var taskId: Long,
var attemptNumber: Int,
var executorId: String,
var name: String,
var index: Int,
var taskFiles: mutable.Map[String, Long],
var taskJars: mutable.Map[String, Long],
var task: Task[_])
```
## How was this patch tested?
TODO ...
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/witgo/spark SPARK-17931
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15505.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #15505
----
commit b51d00ce0f737e5b3568668e5d9225a805a4abea
Author: Guoqiang Li <wi...@qq.com>
Date: 2016-10-16T08:27:37Z
taskScheduler has some unneeded serialization
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