[ambari-2.7.3][mysql]ambari-server upgrade commands fails with SQLSyntaxErrorException

[#1]

Problem statement : i am upgrading my ambari-2.6.2.2 to ambari-2.7.3 and the ambari-server upgrade commands fails with exception : java.sql.SQLSyntaxErrorException: Unknown table 'ambari_configuration' in information_schema

[root@slambe-1 java]# ambari-server upgrade
Using python  /usr/bin/python
Upgrading ambari-server
INFO: Upgrade Ambari Server
INFO: Updating Ambari Server properties in ambari.properties ...
INFO: Updating Ambari Server properties in ambari-env.sh ...
INFO: Original file ambari-env.sh kept
INFO: Fixing database objects owner
Ambari Server configured for MySQL. Confirm you have made a backup of the Ambari Server database [y/n] (n)? y
INFO: Upgrading database schema
ERROR: Unexpected ValueError: No JSON object could be decoded
For more info run ambari-server with -v or --verbose option

when i see ambari-server logs i see the following exception:

2018-12-28 13:59:07,062  INFO [main] DBAccessorImpl:869 - Executing query: CREATE TABLE ambari_configuration (category_name VARCHAR(100) NOT NULL, property_name VARCHAR(100) NOT NULL, property_value VARCHAR(2048)) ENGINE=INNODB
2018-12-28 13:59:07,087 ERROR [main] SchemaUpgradeHelper:209 - Upgrade failed.
java.sql.SQLSyntaxErrorException: Unknown table 'ambari_configuration' in information_schema
  at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120)
  at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
  at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
  at com.mysql.cj.jdbc.StatementImpl.executeQuery(StatementImpl.java:1218)
  at com.mysql.cj.jdbc.DatabaseMetaData$7.forEach(DatabaseMetaData.java:2965)
  at com.mysql.cj.jdbc.DatabaseMetaData$7.forEach(DatabaseMetaData.java:2953)
  at com.mysql.cj.jdbc.IterateBlock.doForAll(IterateBlock.java:56)
  at com.mysql.cj.jdbc.DatabaseMetaData.getPrimaryKeys(DatabaseMetaData.java:3006)
  at org.apache.ambari.server.orm.DBAccessorImpl.tableHasPrimaryKey(DBAccessorImpl.java:1086)
  at org.apache.ambari.server.orm.DBAccessorImpl.addPKConstraint(DBAccessorImpl.java:577)
  at org.apache.ambari.server.orm.DBAccessorImpl.addPKConstraint(DBAccessorImpl.java:588)
  at org.apache.ambari.server.upgrade.UpgradeCatalog270.addAmbariConfigurationTable(UpgradeCatalog270.java:989)
  at org.apache.ambari.server.upgrade.UpgradeCatalog270.executeDDLUpdates(UpgradeCatalog270.java:319)
  at org.apache.ambari.server.upgrade.AbstractUpgradeCatalog.upgradeSchema(AbstractUpgradeCatalog.java:970)
  at org.apache.ambari.server.upgrade.SchemaUpgradeHelper.executeUpgrade(SchemaUpgradeHelper.java:207)
  at org.apache.ambari.server.upgrade.SchemaUpgradeHelper.main(SchemaUpgradeHelper.java:450)
2018-12-28 13:59:07,093 ERROR [main] SchemaUpgradeHelper:475 - Exception occurred during upgrade, failed
org.apache.ambari.server.AmbariException: Unknown table 'ambari_configuration' in information_schema
  at org.apache.ambari.server.upgrade.SchemaUpgradeHelper.executeUpgrade(SchemaUpgradeHelper.java:210)
  at org.apache.ambari.server.upgrade.SchemaUpgradeHelper.main(SchemaUpgradeHelper.java:450)
Caused by: java.sql.SQLSyntaxErrorException: Unknown table 'ambari_configuration' in information_schema
  at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120)
  at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
  at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)

Root Cause : If you are facing the abouve exception while upgrading to ambari-2.7.0 versions the main reason will be mysql-connector.jar .

Please upgrade to supported MySQL connector jar ,currently mysql-5.7 is supported version for ambari, please download connector that supports this version

Please download the MYSQL Connector jar from url : https://dev.mysql.com/downloads/connector/j/5.1.html

Download MYSQL connector 5.1.47 .jar from this url

Change the the mysql-connector using the following docs : https://docs.hortonworks.com/HDPDocuments/Ambari-2.7.3.0/administering-ambari/content/amb_using_hive...

and retry the ambari-server upgrade operation again.

Please contact Hortonworks support if its a production cluster and you cannot do the steps of your own