[HBASE-13885] ZK watches leaks during snapshots

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.98.12
• Fix Version/s: 0.98.14, 1.0.2, 1.2.0, 1.1.1, 1.3.0, 2.0.0
• Component/s: snapshots
• Hadoop Flags: Reviewed
• Assignee: Lars Hofhansl
• Reporter: Abhishek Singh Chouhan
• Created: 10/Jun/15 06:57
• Updated: 31/Aug/15 22:39
• Resolved: 16/Jun/15 19:29

Description

When taking snapshot of a table a watcher over /hbase/online-snapshot/abort/snapshot-name is created which is never cleared when the snapshot is successful. If we use snapshots to take backups daily we accumulate a lot of watches.

Steps to reproduce -
1) Take snapshot of a table - snapshot 'table_1', 'abc'
2) Run the following on zk node or alternatively observe zk watches metric
echo "wchc" | nc localhost 2181
/hbase/online-snapshot/abort/abc can be found.