Now that Impala 3.4 is branched and master is Impala 4.0, we need to decide what breaking changes will happen in Impala 4.0. I have provided a series of proposals below. I welcome feedback on them. Other proposals are also welcome.
Thanks, Joe Proposal 0: Hadoop component versions Switch to CDP versions of components by default. This means that Impala will use Hive 3+ (which is already essentially Hive 4 and may change names to being Hive 4). Remove support for CDH versions of components. This was already discussed in the original thread for Impala 4, so this is not new. Proposal 1: OS support Drop support for Centos 6, Ubuntu 14, and Debian (all versions) Retain support for Ubuntu 16, Ubuntu 18, Centos 7, and SLES 12 Centos 7 development will be focused on newer Centos 7 versions such as 7.6 and 7.7. Add support for Centos 8 Move main development from Ubuntu 16 to Ubuntu 18 over time. Proposal 2: Python support Drop support for Python 2.6 Add support for Python 3 over time. Proposal 3: Impala-lzo Drop support for Impala-lzo/hadoop-lzo Proposal 4: Clients Deprecate beeswax protocol. This means that it can be removed in the next major version number, but it would not be removed in Impala 4. Current users of beeswax would need to start migrating to HS2. Proposal 5: Sentry Drop support for Sentry in favor of Ranger. Proposal 6: Metadata Metadata V2 will become the default. Metadata V1 will be deprecated. Thanks, Joe
