What's New in Apache HBase

You can use Procedure V2 or procv2, which is an updated framework for executing multi-step, HBase administrative operations when there is a failure. The introduction of this capability is to implement all master operations using procv2 to remove the need for tools like hbck in the future. Use procv2 for creating, modifying and deleting tables. Other systems like new AssignmentManager is implemented using proc-v2.

When you write data into HBase through Put operation, the cell objects do not enter JVM heap until the data is flushed to disk in an HFile. This helps to reduce total heap usage of a RegionServer and it copies less data making it more efficient.

This replaces the old Java NIO RPC server with a Netty RPC server. Netty provides you the ability to easily provide an Asynchronous Java client API.

Periodic reorganization of the data in the Memstore can result in a reduction of overall I/O, that is data written and accessed from HDFS. The net performance increases when we keep more data in memory for a longer period of time.

HBase now internally shades commonly-incompatible dependencies to prevent issues for downstream users. You can use shaded client jars that will reduce the burden on the existing applications.

There are minor changes made to the API to remove ambiguous, misleading, and dangerous calls.