[SQOOP-2574] Sqoop2: Provide classpath isolation for Connectors - ASF JIRA

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Currently there is no classpath isolation in Sqoop 2. This will cause problems in the following two cases:

If the dependencies of the downstream users of the Sqoop 2 client conflicts with the dependencies of Sqoop 2 client
If the dependencies of third-part connectors conflicts with the dependencies of Sqoop 2 server or conflicts with other third-part connectors
This JIRA focuses on providing classpath isolation for connectors by using a webapp-style custom classloader to load third-part connectors.

1.	Sqoop2: Support loading classes using custom classloader in ClassUtils	Resolved	Dian Fu
2.	Sqoop2: Port the ApplicationClassLoader in Hadoop into Sqoop	Resolved	Dian Fu
3.	Sqoop2: Provide classpath isolation for Connectors	Resolved	Unassigned
4.	Sqoop2: Add documentation about connector classpath isolation	Resolved	Dian Fu
5.	Sqoop2: Add documentation about connector classpath isolation	Resolved	Dian Fu
6.	Sqoop2: add partition class to FROM	Resolved	Dian Fu
7.	Sqoop2: Allow to specify extra system classes for ConnectorClassLoader	Resolved	Dian Fu
8.	Sqoop2: Provide classpath isolation for connectors and its dependencies	Resolved	Dian Fu
9.	Sqoop2: Improve ConnectorClassLoader to support loading classes from the dependencies inside the connector jar	Resolved	Dian Fu
10.	Sqoop2: Provide connector classpath isolation during running MR job	Resolved	Dian Fu
11.	Sqoop2: Provide connector classpath isolation during running MR job	Resolved	Unassigned
12.	Sqoop2: Add integration tests for connector classpath isolation	Resolved	Dian Fu
13.	Sqoop2: Remove unnecessary dependencies of sqoop server module	Resolved	Dian Fu
14.	Sqoop2: Use maven shade plugin to package connector dependencies with the connector jar itself	Resolved	Unassigned