開發四年只會寫業務代碼，分布式高并發都不會還做程式員？->>>
Total jobs = 1
Launching Job 1 out of 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>
FAILED: Execution Error, return code 30041 from org.apache.hadoop.hive.ql.exec.spark.SparkTask. Failed to create Spark client for Spark session 25449a9c-954c-4860-a0f8-8a625e7826d7: java.util.concurrent.TimeoutException: Client '25449a9c-954c-4860-a0f8-8a625e7826d7' timed out waiting for connection from the Remote Spark Driver
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