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https://reviews.apache.org/r/61050/
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Review request for Ambari, Dmytro Grinenko, Di Li, Dmitro Lisnichenko, Jonathan 
Hurley, Sumit Mohanty, Sid Wagle, and Tim Thorpe.


Bugs: AMBARI-21555
    https://issues.apache.org/jira/browse/AMBARI-21555


Repository: ambari


Description
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IOP uses MariaDB instead of MySQL when a cluster is on RedHat 7. HDP 2.6/Ambari 
2.5.2 is yet to support MariaDB. A special flag is introduced to switch daemon 
type for migrated clusters. Currently the flag is added during EU 
(AMBARI-21351) to handle both IOP 4.2 and 4.2.5. We also need this flag to be 
added during Ambari upgrade for IOP 4.2.5 to restart MySQL ( IOP 4.2 is 
self-contained, thus not need this flag for restarting MySQL)


Diffs
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ambari-server/src/main/java/org/apache/ambari/server/upgrade/UpgradeCatalog252.java
 ea1b034 


Diff: https://reviews.apache.org/r/61050/diff/1/


Testing
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patch cluster with ambari-server jar, run ambari-server upgrade, verify 
mariadb_redhat_support=true got added to hive-env post ambari upgrade.


Thanks,

Di Li

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