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https://issues.apache.org/jira/browse/HIVE-6050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14160519#comment-14160519
 ] 

Brock Noland commented on HIVE-6050:
------------------------------------

AFAIK there is no present work around. The server must be higher or equal to 
the client.

> JDBC backward compatibility is broken
> -------------------------------------
>
>                 Key: HIVE-6050
>                 URL: https://issues.apache.org/jira/browse/HIVE-6050
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2, JDBC
>    Affects Versions: 0.13.0
>            Reporter: Szehon Ho
>            Assignee: Carl Steinbach
>            Priority: Blocker
>
> Connect from JDBC driver of Hive 0.13 (TProtocolVersion=v4) to HiveServer2 of 
> Hive 0.10 (TProtocolVersion=v1), will return the following exception:
> {noformat}
> java.sql.SQLException: Could not establish connection to 
> jdbc:hive2://localhost:10000/default: Required field 'client_protocol' is 
> unset! Struct:TOpenSessionReq(client_protocol:null)
>       at 
> org.apache.hive.jdbc.HiveConnection.openSession(HiveConnection.java:336)
>       at org.apache.hive.jdbc.HiveConnection.<init>(HiveConnection.java:158)
>       at org.apache.hive.jdbc.HiveDriver.connect(HiveDriver.java:105)
>       at java.sql.DriverManager.getConnection(DriverManager.java:571)
>       at java.sql.DriverManager.getConnection(DriverManager.java:187)
>       at 
> org.apache.hive.jdbc.MyTestJdbcDriver2.getConnection(MyTestJdbcDriver2.java:73)
>       at 
> org.apache.hive.jdbc.MyTestJdbcDriver2.&lt;init&gt;(MyTestJdbcDriver2.java:49)
>       at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
>       at 
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
>       at 
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>       at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:187)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:236)
>       at 
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:233)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
>       at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
>       at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
>       at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
>       at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
>       at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
>       at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
>       at junit.framework.JUnit4TestAdapter.run(JUnit4TestAdapter.java:39)
>       at 
> org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:523)
>       at 
> org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1063)
>       at 
> org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:914)
> Caused by: org.apache.thrift.TApplicationException: Required field 
> 'client_protocol' is unset! Struct:TOpenSessionReq(client_protocol:null)
>       at 
> org.apache.thrift.TApplicationException.read(TApplicationException.java:108)
>       at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:71)
>       at 
> org.apache.hive.service.cli.thrift.TCLIService$Client.recv_OpenSession(TCLIService.java:160)
>       at 
> org.apache.hive.service.cli.thrift.TCLIService$Client.OpenSession(TCLIService.java:147)
>       at 
> org.apache.hive.jdbc.HiveConnection.openSession(HiveConnection.java:327)
>       ... 37 more
> {noformat}
> On code analysis, it looks like the 'client_protocol' scheme is a ThriftEnum, 
> which doesn't seem to be backward-compatible.  Look at the code path in the 
> generated file 'TOpenSessionReq.java', method 
> TOpenSessionReqStandardScheme.read():
> 1. The method will call 'TProtocolVersion.findValue()' on the thrift 
> protocol's byte stream, which returns null if the client is sending an enum 
> value unknown to the server.  (v4 is unknown to server)
> 2. The method will then call struct.validate(), which will throw the above 
> exception because of null version.  
> So doesn't look like the current backward-compatibility scheme will work.



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