==============================================================================
Amazon JDBC Connector for Apache Hive Release Notes
==============================================================================

The release notes provide details of enhancements, features, known issues, 
and workflow changes in Amazon JDBC Connector for Apache Hive 2.6.33, as well 
as the version history.


This version of the connector supports the following data source versions and 
Java platforms:

 * Apache Hive 1.0.1 to 3.1.3

 * Java 8, 9, 11, 17, 21, 25


2.6.33 =======================================================================

Released 2026-04-24

Enhancements & New Features

 * [HIVEJ-904] Updated third-party libraries

   The connector now uses the following third-party libraries:
   - jackson-annotations 2.21 (previously 2.20.0)
   - jackson-core 2.21.2 (previously 2.20.0)
   - jackson-databind 2.21.2 (previously 2.20.0)   
   - log4j-api 2.25.4 (previously 2.25.3)
   - log4j-core 2.25.4 (previously 2.25.3)
   - log4j-slf4j-impl 2.25.4 (previously 2.25.3)
   - zookeeper 3.9.5 (previously 3.9.4)
   - zookeeper-jute 3.9.5 (previously 3.9.4)
   
 * [HIVEJ-905] Added support for Java 25

   The connector now supports Java 25.  


Workflow Changes =============================================================

The following changes may disrupt established workflows for the connector. 

2.6.32 -----------------------------------------------------------------------

 * [HIVEJ-901] Fixed an issue where the driver does not handle URL encoding in
   the connection string correctly.

   When using semicolons (;), percent signs (%), or any other URL reserved 
   characters in the connection string for any property value, 
   URL encoding/Percent-encoding must be used to represent them.

2.6.26 -----------------------------------------------------------------------
 
 * [04836192][HIVEJ-820] Updated JAAS configuration information

   By default, the JAAS configuration is turned off when Kerberos  
   authentication is used. To turn it on, set the JDBC_ENABLE_JAAS environment  
   variable to 1. For more information, see the Installation and Configuration
   Guide.
   
 * [HIVEJ-649] Removed support for Hive Server 1.0.0 and earlier versions

   Beginning with this release, the connector no longer supports Hive Server 
   1.0.0 and earlier versions. For a list of supported Hive Server versions,  
   see the Installation and Configuration Guide.
   

2.6.19 -----------------------------------------------------------------------

 * Removed slf4j-log4j12 dependency

   Beginning with this release, the connector no longer includes the 
   slf4j-log4j12 library in the JAR file.   


2.6.17 -----------------------------------------------------------------------

 * Removed support for JDBC 4 (Java 6)

   Beginning with this release, the connector no longer supports JDBC 4 (Java
   6). For a list of supported JDBC versions, see the Installation and 
   Configuration Guide.


2.6.1 ------------------------------------------------------------------------

 * Removed support for JDBC 3 (Java 5)

   Beginning with this release, the driver no longer supports JDBC 3 (Java 5).
   For a list of supported JDBC versions, see the Installation and 
   Configuration Guide.


Version History ==============================================================

2.6.32 -----------------------------------------------------------------------

Released 2026-03-06

Enhancements & New Features

 * [HIVEJ-882][HIVEJ-883][HIVEJ-895][HIVEJ-897] Updated third-party libraries

   The connector now uses the following third-party libraries:
   - log4j-api 2.25.3 (previously 2.25.2)
   - log4j-core 2.25.3 (previously 2.25.2)
   - log4j-slf4j-impl 2.25.3 (previously 2.25.2)
   - netty-handler 4.1.130 (previously 4.1.118)
   
   The commons-lang library has been removed.


Resolved Issues
The following issue have been resolved in Amazon JDBC Connector for Apache 
Hive 2.6.32.

 * [HIVEJ-900] When using Kerberos with IBM Java 17, an exception 
   occurs during connection.

2.6.30 -----------------------------------------------------------------------

Released 2025-11-28

Enhancements & New Features

 * [HIVEJ-868] Added server logging support
 
   Added the capability to print available server log information to the
   driver logs. To do this, set the EnableServerLogs property. For more 
   details, see the Installation and Configuration Guide.

 * [HIVEJ-872] Added support for Java 21

   The connector now supports Java 21.
   
 * [HIVEJ-873] Updated third-party libraries

   The connector now uses the following third-party libraries:
   - commons-logging 1.3.5 (previously 1.3.4)
   - jackson-annotations 2.20.0 (previously 2.18.2)
   - jackson-core 2.20.0 (previously 2.18.2)
   - jackson-databind 2.20.0 (previously 2.18.2)
   - log4j-api 2.25.2 (previously 2.24.3)
   - log4j-core 2.25.2 (previously 2.24.3)
   - log4j-slf4j-impl 2.25.2 (previously 2.24.3)
   - slf4j 2.0.17 (previously 2.0.16)
   - zookeeper 3.9.4 (previously 3.9.3)
   - zookeeper-jute 3.9.4 (previous 3.9.3)


Resolved Issues
The following issues have been resolved in Amazon JDBC Connector for Apache 
Hive 2.6.30.

 * [HIVEJ-851] Fixed an issue where Netty Handler still shows version 4.1.113 
   in META-INF, even after upgrading to 4.1.118.

 * [HIVEJ-853] Fixed an issue with incorrect rounding of Decimal numbers with
   varying precision for parameterized insert batch queries.

 * [HIVEJ-854][HIVEJ-869] Fixed an issue with the driver logging extraneous 
   messages when log4j is already in the classpath. To resolve the issue, 
   please use the lean connector JAR instead of the standard connector JAR.


2.6.28 -----------------------------------------------------------------------

Released 2025-02-28

Enhancements & New Features

 * [HIVEJ-834][HIVEJ-841] Updated third-party libraries

   The connector now uses the following third-party libraries:
   - commons-codec 1.17.2 (previously 1.17.1)
   - Jackson annotations 2.18.2 (previously 2.16.1)
   - Jackson core 2.18.2 (previously 2.16.1)
   - Jackson databind 2.18.2 (previously 2.16.1)
   - log4j-api 2.24.3 (previously 2.24.1)
   - log4j-core 2.24.3 (previously 2.24.1)
   - log4j-slf4j-impl 2.24.3 (previously 2.24.1)
   - netty-handler 4.1.118 (previously 4.1.115)


2.6.26 -----------------------------------------------------------------------

Released 2024-08-13

Enhancements & New Features

 * [HIVEJ-779] Updated SSLTrustStoreType property

   For the SSLTrustStoreType property, you can now specify the TrustStore  
   type. For more information, see the Installation and Configuration Guide.

 * [04836192][HIVEJ-820] Security improvement
   
   The connector has been updated with security improvements.


2.6.19 -----------------------------------------------------------------------

Released 2022-03-04

Enhancements & New Features

 * Updated log4j third-party libraries

   The JDBC 4.2 version of the connector has been updated to version 2.17.1
   of the log4j third-party libraries.

   The JDBC 4.1 version of the connector has been updated to version 2.12.4
   of the log4j third-party libraries. To address security vulnerabilities, do
   one of the following: 
   - In PatternLayout in the logging configuration, replace Context Lookups 
     like ${ctx:loginId} or $${ctx:loginId} with Thread Context Map patterns 
     (%X, %mdc, or %MDC). 
   - Otherwise, in the configuration, remove references to Context Lookups 
     like ${ctx:loginId} or $${ctx:loginId} where they originate from sources
     external to the application such as HTTP headers or user input.
 
 * Updated Jackson library

   The connector now uses version 2.13.1 of the Jackson library. Previously, 
   the connector used Jackson version 2.12.3. 
   

Resolved Issues
The following issue has been resolved in Amazon JDBC Connector for Apache Hive
2.6.19.

 * When close() is not called on the connection object, the connector prevents
   the JVM from exiting.  


2.6.17 ----------------------------------------------------------------------- 

Released 2021-12-24

Enhancements & New Features

 * Updated log4j third-party libraries

   The JDBC 4.2 version of the connector has been updated to version 2.17.0 
   of the log4j third-party libraries.
   
   The JDBC 4.1 version of the connector has been updated to version 2.12.2
   of the log4j third-party libraries. To address security vulnerabilities, do
   one of the following: 
   - In PatternLayout in the logging configuration, replace Context Lookups 
     like ${ctx:loginId} or $${ctx:loginId} with Thread Context Map patterns 
     (%X, %mdc, or %MDC). 
   - Otherwise, in the configuration, remove references to Context Lookups 
     like ${ctx:loginId} or $${ctx:loginId} where they originate from sources
     external to the application such as HTTP headers or user input.

 * Third-party library upgrades

   The connector has been upgraded with the following third-party libraries:
   - Apache Commons Codec 1.15 (previously 1.9)
   - Apache HttpClient 4.5.13 (previously 4.5.3)
   - Apache HttpCore 4.4.14 (previously 4.4.6)
   - Jackson 2.12.3 (previously 2.10.1)
      
   The JDBC 4.1 connector has been updated to use slf4j 1.7.30. 

 * Upgraded ZooKeeper library 
 
   The JDBC 4.2 version of the connector now uses version 3.7.0 of the 
   ZooKeeper and ZooKeeper Jute library. Previously, this version of the 
   connector used ZooKeeper version 3.4.14. 

   The JDBC 4.1 version of the connector continues to use ZooKeeper version
   3.4.14 because ZooKeeper versions later than 3.4.14 no longer support 
   Java 7.
   
 * SSO authentication
 
   You can now authenticate using single sign-on (SSO) via SAML 2.0 on
   supported servers. For more information, see the Installation and
   Configuration Guide.

 * Updated SSL support
 
   The connector now supports BCFKS TrustStores files. To specify the 
   TrustStore type, set the SSLTrustStoreType property to the preferred type.
   For more information, see the Installation and Configuration Guide.
   
 * Simulate transactions
 
   You can now specify whether the connector simulates or ignores 
   transactions. To do this, set the IgnoreTransactions property. For more
   details, see the Installation and Configuration Guide.

 * Updated documentation

   The FastConnection and LoginTimeout properties are now documented in the
   Installation and Configuration Guide. For more details, see the 
   Installation and Configuration Guide.

 * Updated ZooKeeper support

   When connecting with ZooKeeper, the connector now returns available servers
   in a round-robin rotation.    
   
 * Support for Java 11

   The connector now supports Java 11.   
   

Resolved Issues
The following issues have been resolved in Amazon JDBC Connector for Apache 
Hive 2.6.17.

 * The HiveJDBCDataEngine does not check getFunctions and returns an empty 
   result set. 

 * When a ZooKeeper connection URL does not contain a namesapce for each host,
   the connector does not close the connection properly.  

 * When connecting to HiveServer1 instances using the Connection
   isValid method, the connector returns an incorrect value.  

 * The connector logs incorrect socket timeout values. 

 * When the connection is not valid, the connector does not notify the 
   ConnectionEventListener object as expected.      
   

2.6.12 ----------------------------------------------------------------------- 

Released 2020-09-04

Enhancements & New Features

 * Binary column length

   You can now specify the maximum size of binary columns. To do this, set the
   BinaryColumnLength property to the specified column length. For more 
   details, see the Installation and Configuration Guide.
    
 * Updated third-party libraries
 
   The JDBC 4.2 driver has been updated to use the following libraries:
   - jackson 2.10.1
   - log4j 2.13.3
   - slf4j 1.7.30
   - Thrift 0.13.0

   The JDBC 4.1 driver continues to use the previous versions of these 
   libraries.


Resolved Issues
The following issues have been resolved in Amazon JDBC Driver for Apache Hive 
2.6.12. 

 * The driver does not honor the values set via the Statement.setFetchSize 
   JDBC API call.
   
 * Queries with a UNION clause are replaced with a UNION ALL clause.
   
 * The JDBC 4.1 version of the driver fails to connect to servers that require
   encryption using TLS 1.2.

 * When you invoke the JDBC 4.2 driver with the Datasource class, an exception
   occurs.

 * When you use the driver with the Denodo application, it returns the 
   following error: "Could not initialize Class".

 * In some cases, Hive queries fail with the following error: 
   "com.amazon.hiveserver2.exceptions.ExceptionConverter.toSQLException:
   [JDBC Driver]Index: 4, Size: 4"

 * SQL statements using the EXISTS predicate return an error.

 * The driver returns incorrect results for decimal columns.
 

2.6.9 ------------------------------------------------------------------------

Released 2019-10-04

Enhancements & New Features

 * Updated third-party libraries

   The driver now uses the following third-party libraries:
   - jackson 2.9.9
   - jackson-databind 2.9.9.3
   - Log4j 1.2.17
   - slf4j-api 1.7.25
   - slf4j-log4j12 1.7.25
   - Thrift 0.12.0
   - ZooKeeper 3.4.14

 * Support for JDBC 4.2

   The driver now supports JDBC 4.2. For more details see the Installation and
   Configuration Guide.

 * New JDBC class names

   The driver now supports the following class names for Driver and 
   DataSource that are independent of the JDBC version used:
   - com.amazon.hive.jdbc.HS1Driver
   - com.amazon.hive.jdbc.HS2Driver
   - com.amazon.hive.jdbc.HS1DataSource
   - com.amazon.hive.jdbc.HS2DataSource

   The previous JDBC-version-specific class names for 4.0 and 4.1 are still 
   supported.

 * Renaming join columns

   By default, the driver does not allow join columns to be renamed. To 
   enable the renaming of join columns, set the RenameJoinColumn property to 
   "true".

 * Updated Hive Service support

   The driver now uses Hive Service 3.1.1 for HiveServer2 connections.

 * Updated Hive support

   The driver now supports Apache Hive versions 0.11 through 3.1.


Resolved Issues
The following issues have been resolved in Amazon JDBC Driver for Apache Hive 
2.6.9. 

 * The driver resolves the host name to an IP address for SSL 
   verification, causing the host name verification step to fail.

  * The driver incorrectly treats SSLTrustStore and SSLTrustStorePWD as 
    server-side properties.

 * If a SQL query ends in a semicolon, the driver reports an error.

   This issue has been resolved. The driver now removes trailing semicolons 
   from queries before sending them to the server.

 * Queries that use REGEX column specification fail.
   
   This issue has been resolved. The driver no longer attempts to parse REGEX 
   column specification.


2.6.2 ------------------------------------------------------------------------ 

Released 2018-08-03

Resolved Issues
The following issue was resolved in Amazon Hive JDBC Driver 2.6.2.

 * The driver does not behave according to the SocketTimeout setting, and
   stops responding instead of returning an  error when the server takes too
   long to respond to a request.
   
   This issue has been resolved. The driver now returns an error if the amount
   of time taken by the server to respond to a request exceeds the number of
   seconds specified by the SocketTimeout setting.
   

2.6.1 ------------------------------------------------------------------------

Released 2018-04-24

Enhancements & New Features

 * Improved installation process

   Third-party libraries are now bundled with the driver as a shaded jar 
   file.

 * Updated hive-service

   The driver has been upgraded to use hive-service-2.0.1 with JDBC 4.1 and
   hive-service-1.1.1 for JDBC 4.

 * Updated third-party libraries

   The driver has been upgraded to use 
   - http-client 4.5.3
   - http-core 4.4.6
   - commons-codec 1.9
   - commons-logging 1.2
   - ZooKeeper 3.4.11


Resolved Issues
The following issues have been resolved in Amazon JDBC Driver for Apache Hive 
2.6.1.

 * A string literal after a back-tick ( ` ) is treated as a comment.

 * When the driver attempts to connect to the server using Beeline, an 
   error occurs on the server and an exception is logged by the driver. 

   This issue has been resolved. Now, when connecting to the server using 
   Beeline, connection properties such as "driver" and "url" are no longer 
   treated as configuration properties for the server, and the driver does 
   not send SET queries to the server with these properties.
   
 * The driver removes query comments and hints when the UseNativeQuery 
   property is set to 1. 


==============================================================================
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