Databricks Runtime 6.4 Extended Support was a version of Databricks’ platform that offered extended support for legacy applications and workloads. It was based on Apache Spark 2.4.5 and Scala 2.11.

Key points:

• End of Support: The official end-of-support date for Databricks Runtime 6.4 Extended Support was extended to June 30, 2022. This means it no longer receives updates or security patches.
• Legacy Applications: It was primarily intended for users who had older applications or libraries that were not compatible with newer Databricks Runtime versions.
• Not Recommended: Databricks strongly recommends upgrading to newer versions of Databricks Runtime for improved performance, features, and security.