[HBASE-24490] Revisit onlineRegions and onlineRegionsLock in HRegionServer

• Type: Task
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Component/s: regionserver
• Assignee: Semen Komissarov
• Reporter: Duo Zhang
• Created: 02/Jun/20 08:47
• Updated: 20/Aug/21 12:07

Description

The onlineRegionsLock is only used in closeMetaTableRegions and closeUserRegions, and only writeLock is used so I wonder whether we can change it to a Lock instead of ReadWriteLock.

And also, in the several getRegions method, we have synchronized (this.onlineRegions), which is not necessary, since the onlineRegions is already a ConcurrentMap.

Issue Links

• links to: GitHub Pull Request #2554