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From "Mark Grey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6050) JDBC backward compatibility is broken
Date Thu, 03 Jul 2014 13:48:25 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14051444#comment-14051444
] 

Mark Grey commented on HIVE-6050:
---------------------------------

Is there a workaround for overcoming the Thrift problem when connecting newer clients to an
older hiveserver2?  I'd like to hook up Hue into an existing hiveserver in production.

> 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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