最近再hue 集群查詢任務經常失敗，經過幾天的觀察，終於找到原因，報錯如下
Status: Failed
Vertex failed, vertexName=Map 1, vertexId=vertex_1514128895713_0770_1_00, diagnostics=[Task failed, taskId=task_1514128895713_0770_1_00_000006, diagnostics=[TaskAttempt 0 failed, info=[Container container_1514128895713_0770_01_000008 finished with diagnostics set to [Container failed, exitCode=-100. Container released on a *lost* node]], TaskAttempt 1 failed, info=[Container container_1514128895713_0770_01_000026 finished with diagnostics set to [Container failed, exitCode=-100. Container released on a *lost* node]], TaskAttempt 2 failed, info=[Container container_1514128895713_0770_01_000036 finished with diagnostics set to [Container failed, exitCode=-100. Container released on a *lost* node]], TaskAttempt 3 failed, info=[Container container_1514128895713_0770_01_000042 finished with diagnostics set to [Container failed, exitCode=-100. Container released on a *lost* node]]], Vertex did not succeed due to OWN_TASK_FAILURE, failedTasks:1 killedTasks:0, Vertex vertex_1514128895713_0770_1_00 [Map 1] killed/failed due to:OWN_TASK_FAILURE]
Vertex killed, vertexName=Reducer 2, vertexId=vertex_1514128895713_0770_1_01, diagnostics=[Vertex received Kill while in RUNNING state., Vertex did not succeed due to OTHER_VERTEX_FAILURE, failedTasks:0 killedTasks:6, Vertex vertex_1514128895713_0770_1_01 [Reducer 2] killed/failed due to:OTHER_VERTEX_FAILURE]
DAG did not succeed due to VERTEX_FAILURE. failedVertices:1 killedVertices:1
FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.tez.TezTask. Vertex failed, vertexName=Map 1, vertexId=vertex_1514128895713_0770_1_00, diagnostics=[Task failed, taskId=task_1514128895713_0770_1_00_000006, diagnostics=[TaskAttempt 0 failed, info=[Container container_1514128895713_0770_01_000008 finished with diagnostics set to [Container failed, exitCode=-100. Container released on a *lost* node]], TaskAttempt 1 failed, info=[Container container_1514128895713_0770_01_000026 finished with diagnostics set to [Container failed, exitCode=-100. Container released on a *lost* node]], TaskAttempt 2 failed, info=[Container container_1514128895713_0770_01_000036 finished with diagnostics set to [Container failed, exitCode=-100. Container released on a *lost* node]], TaskAttempt 3 failed, info=[Container container_1514128895713_0770_01_000042 finished with diagnostics set to [Container failed, exitCode=-100. Container released on a *lost* node]]], Vertex did not succeed due to OWN_TASK_FAILURE, failedTasks:1 killedTasks:0, Vertex vertex_1514128895713_0770_1_00 [Map 1] killed/failed due to:OWN_TASK_FAILURE]Vertex killed, vertexName=Reducer 2, vertexId=vertex_1514128895713_0770_1_01, diagnostics=[Vertex received Kill while in RUNNING state., Vertex did not succeed due to OTHER_VERTEX_FAILURE, failedTasks:0 killedTasks:6, Vertex vertex_1514128895713_0770_1_01 [Reducer 2] killed/failed due to:OTHER_VERTEX_FAILURE]DAG did not succeed due to VERTEX_FAILURE. failedVertices:1 killedVertices:1
分析：
taskId=task_1514128895713_0770_1_00_000006 失敗了幾次，失敗的原因是container被高優先級的任務搶占了。而task最大的失敗次數默認是4.當集群上的任務比較多時，比較容易出現這個問題。還有一個原因我認為container設置的內存太小，我這是1.5G 不過沒有修改，我設置了以下參數就解決了：
解決方案：
問題解決了，希望幫到你