题目内容
（请给出正确答案）
[多选题]
hiveTezjob的Reducetask启动数量只有2个，导致job在Reducetask阶段运行时长过大，应对关注那些参数调优?()
A.hive.exec.reducers.max
B.mapred.reduce.tasks
C.hive.exec.reducers.bytes.per.reducer
D.explainplan分析hsql关注ReduceOutputOperator的Datasize
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