workming：请教一下，Spark On YARN总会失败，信息如下：|@|2014-01-03 16:14:06,675 WARN [main] yarn.ApplicationMaster (Logging.scala:logWarning(60)) - Failed to connect to driver at namenode1:3039, retrying ...|@|2014-01-03 16:14:06,775 WARN [main] yarn.ApplicationMaster (Logging.scala:logWarning(60)) - Failed to connect to driver at namenode1:3039, retrying ...|@|2014-01-03 16:14:06,878 WARN [main] yarn.ApplicationMaster (Logging.scala:logWarning(60)) - Failed to connect to driver at namenode1:3039, retrying ...|@|2014-01-03 16:14:06,979 INFO [main] yarn.ApplicationMaster (Logging.scala:logInfo(48)) - Waiting for Spark context initialization|@|2014-01-03 16:14:06,979 INFO [main] yarn.ApplicationMaster (Logging.scala:logInfo(48)) - Waiting for Spark context initialization ... 0|@|2014-01-03 16:14:07,509 INFO [Thread-3] ipc.Client (Client.java:handleConnectionFailure(783)) - Retrying connect to server: 0.0.0.0/0.0.0.0:8030. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)|@|2014-01-03 16:14:08,510 INFO [Thread-3] ipc.Client (Client.java:handleConnectionFailure(783)) - Retrying connect to server: 0.0.0.0/0.0.0.0:8030. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)|@||@|