[HBASE-6931] Refine WAL interface

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Later
• Component/s: wal
• Assignee: Unassigned
• Reporter: Flavio Paiva Junqueira
• Created: 03/Oct/12 08:23
• Updated: 14/Jun/22 21:21
• Resolved: 14/Jun/22 21:21

Description

We have transformed HLog into an interface and created FSHLog to contain the current implementation of HLog in HBASE-5937. In that patch, we have essentially exposed the public methods, moved method implementations to FSHLog, created a factory for HLog, and moved static methods to HLogUtil.

In this umbrella jira, the idea is to refine the WAL interface, making it not dependent upon a file system as it is currently. The high-level idea is to revisit the methods in HLog and HLogUtil and come up an interface that can accommodate other backends, such as BookKeeper. Another major task here is to decide what to do with the splitter.

Sub-Tasks

• Revisit methods of HLog: Closed
• Remove splitter from the wal interface: Closed
• Revisit methods of HLogUtil: Closed
• Revisit methods of HLogMetrics: Closed
• Rename HLog interface to WAL: Closed
• Remove synchronization around closeLogSyncer (findbugs warning): Closed
• Move resetLogReaderClass to TestHLogSplit: Closed
• Fix the wrong reference to getReader survived in theFSHLog javadoc: Closed