What does it mean that multiple map=0%,reduce=0% appear in succession in hadoop?

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normal hadoop execution

hadoop

what does it mean that multiple map=0%,reduce=0% appear in succession?
Last error report:
Error while processing statement: FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask

guess: is it caused by the deep nesting of sql?

Update: just add this sentence set hive.auto.convert.join=false

Mysql oracle redis

Mar.10,2021

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