Details
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Bug
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Status: Open
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Major
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Resolution: Unresolved
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0.13.0
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None
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None
Description
HiveServer2 instance has to be upgraded before the JDBC drivers used by applications are upgraded. If jdbc drivers are updated before HiveServer2 is upgraded it will not be functional.
Connect from JDBC driver of Hive 0.13 (TProtocolVersion=v4) to HiveServer2 of Hive 0.10 (TProtocolVersion=v1), will return the following exception:
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.<init>(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.$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
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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