[HBASE-15228] Add the methods to RegionObserver to trigger start/complete restoring WALs

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: Coprocessors
• Hadoop Flags: Reviewed

Release Note

Added two hooks around WAL restore.
preReplayWALs(final ObserverContext<? extends RegionCoprocessorEnvironment> ctx, HRegionInfo info, Path edits)
and
postReplayWALs(final ObserverContext<? extends RegionCoprocessorEnvironment> ctx, HRegionInfo info, Path edits)

Will be called at start and end of restore of a WAL file.
The other hook around WAL restore (preWALRestore ) will be called before restore of every entry within the WAL file.

• Assignee: Toshihiro Suzuki
• Reporter: Toshihiro Suzuki
• Created: 08/Feb/16 05:30
• Updated: 21/May/16 08:09
• Resolved: 21/May/16 04:27

Description

In our use case, we write indexes to a index table when restoring WALs. We want to trigger start/complete restoring WALs for initial and end processing for writing indexes.