[STORM-244] DRPC timeout can return null instead of throwing an exception

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.9.2-incubating
• Component/s: storm-core
• Assignee: Kyle Nusbaum
• Reporter: Robert Joseph Evans
• Created: 25/Feb/14 18:17
• Updated: 09/Oct/15 00:55
• Resolved: 06/Jun/14 16:47

Description

In DPRC there is a race condition when the cleanup method is called between releasing the sem, cleaning up the atoms and the blocked thread fetching the result. It looks like it is possible on a timeout that the sem will be released but by the time the thread blocked on the sem actually wakes up the result may have been removed, causing a null to be returned instead of an exception being thrown.