我正在尝试在Hadoop(2.6.1)上运行Gridmix我能够在yarn上运行mapreduce作业并运行Rumen来提取轨迹进行模拟,但是我无法完成最后一步并运行gridmix。如果我检查日志,我发现了一个错误:{"org.apache.hadoop.mapreduce.jobhistory.TaskAttemptUnsuccessfulCompletion"{"taskid":"task_1449829849459_0042_m_000000","taskType":"MAP","attemptId":"attempt_1449829849459_0042_m_000000_0"