SPARK-1408 Modify Spark on Yarn to point to the history server when app ...

...finishes

Note this is dependent on https://github.com/apache/spark/pull/204 to have a working history server, but there are no code dependencies.

This also fixes SPARK-1288 yarn stable finishApplicationMaster incomplete. Since I was in there I made the diagnostic message be passed properly.

Author: Thomas Graves <tgraves@apache.org>

Closes #362 from tgravescs/SPARK-1408 and squashes the following commits:

ec89705 [Thomas Graves] Fix typo.
446122d [Thomas Graves] Make config yarn specific
f5d5373 [Thomas Graves] SPARK-1408 Modify Spark on Yarn to point to the history server when app finishes

docs/running-on-yarn.md

@@ -42,6 +42,7 @@ System Properties:
 * `spark.yarn.preserve.staging.files`, set to true to preserve the staged files(spark jar, app jar, distributed cache files) at the end of the job rather then delete them.
 * `spark.yarn.scheduler.heartbeat.interval-ms`, the interval in ms in which the Spark application master heartbeats into the YARN ResourceManager. Default is 5 seconds. 
 * `spark.yarn.max.executor.failures`, the maximum number of executor failures before failing the application. Default is the number of executors requested times 2 with minimum of 3.
+* `spark.yarn.historyServer.address`, the address of the Spark history server (i.e. host.com:18080). The address should not contain a scheme (http://). Defaults to not being set since the history server is an optional service. This address is given to the Yarn ResourceManager when the Spark application finishes to link the application from the ResourceManager UI to the Spark history server UI. 
 
 # Launching Spark on YARN
 

yarn/alpha/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala

@@ -366,8 +366,7 @@ class ApplicationMaster(args: ApplicationMasterArguments, conf: Configuration,
         finishReq.setAppAttemptId(appAttemptId)
         finishReq.setFinishApplicationStatus(status)
         finishReq.setDiagnostics(diagnostics)
-        // Set tracking url to empty since we don't have a history server.
-        finishReq.setTrackingUrl("")
+        finishReq.setTrackingUrl(sparkConf.get("spark.yarn.historyServer.address", ""))
         resourceManager.finishApplicationMaster(finishReq)
       }
     }

yarn/stable/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala

@@ -347,8 +347,8 @@ class ApplicationMaster(args: ApplicationMasterArguments, conf: Configuration,
 
       logInfo("finishApplicationMaster with " + status)
       if (registered) {
-        // Set tracking URL to empty since we don't have a history server.
-        amClient.unregisterApplicationMaster(status, "" /* appMessage */ , "" /* appTrackingUrl */)
+        val trackingUrl = sparkConf.get("spark.yarn.historyServer.address", "")
+        amClient.unregisterApplicationMaster(status, diagnostics, trackingUrl)
       }
     }
   }