[ZOOKEEPER-2132] Follower::syncWithLeader should roll logs before taking snapshot

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.4.6
• Component/s: server
• Assignee: Unassigned
• Reporter: Asad Saeed
• Created: 26/Feb/15 18:49
• Updated: 04/Feb/16 12:17

Description

If multiple leader elections occur before SyncRequestProcessor takes a snapshot and rolls logs (at least 50000 transactions by default). PurgeTxnLog may inadvertently delete the current transaction log file.

Follower::syncWithLeader currently takes a snapshot after it is synced with the leader but does not roll logs. If a zookeeper restart of a quorum of nodes occurs, the cluster may silently revert back to the last snapshot, loosing all transactions in the log!