Add timeout for fetch file

    Currently, when fetch a file, the connection's connect timeout
    and read timeout is based on the default jvm setting, in this change, I change it to
    use spark.worker.timeout. This can be usefull, when the
    connection status between worker is not perfect. And prevent
    prematurely remove task set.

Author: Jiacheng Guo <[email protected]>

Closes #98 from guojc/master and squashes the following commits:

abfe698 [Jiacheng Guo] add space according request
2a37c34 [Jiacheng Guo] Add timeout for fetch file     Currently, when fetch a file, the connection's connect timeout     and read timeout is based on the default jvm setting, in this change, I change it to     use spark.worker.timeout. This can be usefull, when the     connection status between worker is not perfect. And prevent     prematurely remove task set.

core/src/main/scala/org/apache/spark/util/Utils.scala

@@ -278,6 +278,10 @@ private[spark] object Utils extends Logging {
           uc = new URL(url).openConnection()
         }
 
+        val timeout = conf.getInt("spark.files.fetchTimeout", 60) * 1000
+        uc.setConnectTimeout(timeout)
+        uc.setReadTimeout(timeout)
+        uc.connect()
         val in = uc.getInputStream();
         val out = new FileOutputStream(tempFile)
         Utils.copyStream(in, out, true)

docs/configuration.md

@@ -523,6 +523,15 @@ Apart from these, the following properties are also available, and may be useful
   <td>
     Whether to overwrite files added through SparkContext.addFile() when the target file exists and its contents do not match those of the source.
   </td>
+</tr>
+<tr>
+  <td>spark.files.fetchTimeout</td>
+  <td>false</td>
+  <td>
+    Communication timeout to use when fetching files added through SparkContext.addFile() from
+    the driver.
+  </td>
+</tr>
 <tr>  
   <td>spark.authenticate</td>
   <td>false</td>