Java. Lang. OutOfMemoryError

[#1]

Iam using Ambari. I ran few queries and got the following errors: Vertex failed, vertexName=Map 1, vertexId=vertex_1469016431837_0001_1_00, diagnostics= Task failed, taskId=task_1469016431837_0001_1_00_000000, diagnostics= TaskAttempt 0 failed, info= Error: Failure while running task:java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space at org.apache.hadoop.hive.ql.exec.tez.TezProcessor.initializeAndRunProcessor(TezProcessor.java:159) at org.apache.hadoop.hive.ql.exec.tez.TezProcessor.run(TezProcessor.java:139)

[#2]

I tried to go in tez-site.xml and increased the resource size but i can't write in that file