[FLINK-21789] Make FileChannelManagerImpl#getNextPathNum select data directories fairly

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.15.0
• Component/s: Runtime / Network
• Labels: pull-request-available
• Assignee: Yuxin Tan
• Reporter: Yingjie Cao
• Created: 15/Mar/21 06:27
• Updated: 26/Jan/22 02:24
• Resolved: 26/Jan/22 02:24

Description

The get and increase next path index in FileChannelManagerImpl#getNextPathNum is not atomic which may cause unfairness of data directory selection (bad for performance if multiple disk is configured).

Issue Links

• links to: GitHub Pull Request #18458