[BOOKKEEPER-1061] BookieWatcher should not do ZK blocking operations from ZK async callback thread

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.5.0
• Assignee: Matteo Merli
• Reporter: Matteo Merli
• Created: 10/May/17 20:50
• Updated: 16/May/17 13:36
• Resolved: 15/May/17 19:35

Description

In some cases, the BookieWatcher can get the ZK event thread stuck. This happens when a ZK blocking request is issued from a ZK callback thread.

We should decouple the blocking requests in a separate executor to avoid deadlocking ZK client.

Issue Links

• links to: GitHub Pull Request #149