You can check the explain plan . It provided the order of the execution. It is not a rule that certain reucers would start after all the mapper phase. The ceratin mapper phase depends on the results from the reducers too. You can check the explain plan . If you want map join then you can set property map.auto.conevrt.join =true
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Can you provide the output from MySQL show variables like 'max_allowed_packet'; Please also increase the variable in MySQL: https://dev.mysql.com/doc/refman/8.0/en/packet-too-large.html
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1. Follow below document to run Oozie in time basis (weekly/daily/hourly) https://docs.cloudera.com/documentation/enterprise/6/6.3/topics/admin_oozie_cron.html 2. Follow below document for Oozie email action http://oozie.apache.org/docs/5.2.0/DG_EmailActionExtension.html
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Derby only allows single connection (process) to access the database at a give time, hence only one user can access the Hive. Upgrade your hive metastore to either MySQL, PostgreSQL to support multiple concurrent connections to Hive.
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