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https://issues.apache.org/jira/browse/SPARK-12255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-12255.
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Resolution: Invalid
Questions go to u...@spark.apache.org not JIRA
> why "cache table a as select * from b" will do shuffle,and create 2 stages
> --------------------------------------------------------------------------
>
> Key: SPARK-12255
> URL: https://issues.apache.org/jira/browse/SPARK-12255
> Project: Spark
> Issue Type: Question
> Environment: spark-1.4.1-bin-hadoop2.4
> Reporter: ant_nebula
> Attachments: pic1.jpg, pic2.jpg
>
>
> why "cache table a as select * from b" will do shuffle,and create 2 stages.
> example:
> table "ods_pay_consume" is from "KafkaUtils.createDirectStream"
> {code}
> hiveContext.sql("cache table dwd_pay_consume as select * from
> ods_pay_consume")
> {code}
> this code will create DAG as pic1.jsp
> {code}
> hiveContext.sql(""cache table dw_game_server_recharge as select * from
> dwd_pay_consume")
> {code}
> this code will create DAG as pic2.jsp,and this similar caculate from the
> beginning,"cache table dwd_pay_consume" is not effect.
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