Szehon Ho created HIVE-6050:
-------------------------------
Summary: JDBC backward compatibility is broken
Key: HIVE-6050
URL: https://issues.apache.org/jira/browse/HIVE-6050
Project: Hive
Issue Type: Bug
Components: JDBC
Reporter: Szehon Ho
Connect from JDBC driver of Hive 0.12 (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://hive-c5-mysql-1.ent.cloudera.com: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
com.cloudera.itest.hiveserver.UnmanagedHiveServer.createConnection(UnmanagedHiveServer.java:73)
at
com.cloudera.itest.AbstractTestWithStaticConfiguration.createConnection(AbstractTestWithStaticConfiguration.java:68)
at com.cloudera.itest.FirstTest.sanityConnectionTest(FirstTest.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:69)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)
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$2.evaluate(ParentRunner.java:222)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.ParentRunner.run(ParentRunner.java:292)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at
com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:77)
at
com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:195)
at
com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:63)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: org.apache.thrift.TApplicationException: Required field
'client_protocol' is unset! Struct:TOpenSessionReq(client_protocol:null)
at
org.apache.thrift.TApplicationException.read(TApplicationException.java:108)
at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:71)
at
org.apache.hive.service.cli.thrift.TCLIService$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 generated file
'TOpenSessionReq.java', the method TOpenSessionReqStandardScheme.read(). The
method will call 'TProtocolVersion.findValue() on the thrift protocol's bytes,
which returns null if the client is sending an enum value unknown to the
server. Then struct.validate() at the end of the method will fail because
protocol version is null. So doesn't look like the current
backward-compatibility scheme will work.
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