[ROCKETMQ-323] Release semaphore after callback being finished for async invoke

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0-incubating, 4.1.0-incubating
• Fix Version/s: 4.2.0
• Component/s: rocketmq-client
• Assignee: Xinyu Zhou
• Reporter: Xinyu Zhou
• Created: 06/Dec/17 06:33
• Updated: 13/Dec/17 12:27
• Resolved: 13/Dec/17 12:27

Description

Currently, the async semaphore will be released before invoking the callback, if the callback is a heavy task which is not recommended, lots of async requests will be queued in `publicExecutor` thread pool, may cause OOM or FGC.

Issue Links

• links to: GitHub Pull Request #200