[STORM-1027] Topology may hang because metric-tick function is a blocking call from spout

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.10.0, 0.9.5
• Fix Version/s: 0.10.0, 0.9.6
• Component/s: storm-core
• Assignee: Abhishek Agarwal
• Reporter: Abhishek Agarwal
• Created: 04/Sep/15 07:24
• Updated: 09/Nov/15 21:04
• Resolved: 16/Sep/15 22:35

Description

Nathan had fixed the dining philosopher problem by putting a overflow buffer in the spout so that spout is not blocking. However, overflow buffer is not used when emitting the metric, and that could result in the deadlock. I modified the executor to use overflow buffer for emitting metrics and afterwards topology didn't hang.