[HBASE-13129] Add troubleshooting hints around WAL retention from replication

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: documentation, Replication
• Labels: operations supportability
• Assignee: M Linville
• Reporter: Sean Busbey
• Created: 28/Feb/15 17:11
• Updated: 23/Jun/22 20:26
• Resolved: 14/Apr/16 03:50

Description

There's been some confusion on the mailing list about when WALs get retained / cleaned up once replication is on at all in a cluster. (ref this thread)

We should add a NOTE in the replication section that wals are saved across enable/disable so long as there are peers. There looks like there might also be some confusing language around replication being enabled in the configs vs the enable/disable suspension mechanism.

We should also add a troubleshooting item specific for "my HDFS space keeps growing and it's all in oldWALs."