hive问题汇总

hive> select count(*) from duan;
Query ID = root_20190104154949_2c2d73dc-3059-455b-b845-1ee824f2fd82
Total jobs = 1
Launching Job 1 out of 1
Number of reduce tasks determined at compile time: 1
In order to change the average load for a reducer (in bytes):
  set hive.exec.reducers.bytes.per.reducer=<number>
In order to limit the maximum number of reducers:
  set hive.exec.reducers.max=<number>
In order to set a constant number of reducers:
  set mapreduce.job.reduces=<number>
Starting Job = job_1546564955240_0001, Tracking URL = http://servers3:8088/proxy/application_1546564955240_0001/
Kill Command = /opt/cloudera/parcels/CDH-5.12.2-1.cdh5.12.2.p0.4/lib/hadoop/bin/hadoop job  -kill job_1546564955240_0001
Hadoop job information for Stage-1: number of mappers: 5; number of reducers: 1
2019-01-04 15:53:03,609 Stage-1 map = 80%,  reduce = 0%
Ended Job = job_1546564955240_0001 with errors
Error during job, obtaining debugging information...
Examining task ID: task_1546564955240_0001_m_000003 (and more) from job job_1546564955240_0001
Examining task ID: task_1546564955240_0001_r_000000 (and more) from job job_1546564955240_0001

Task with the most failures(4): 
-----
Task ID:
  task_1546564955240_0001_m_000001

URL:
  http://servers3:8088/taskdetails.jsp?jobid=job_1546564955240_0001&tipid=task_1546564955240_0001_m_000001
-----
Diagnostic Messages for this Task:


FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask
MapReduce Jobs Launched: 
Stage-Stage-1: Map: 5  Reduce: 1   FAIL
Total MapReduce CPU Time Spent: -1 msec