[HDFS-16939] Fix the thread safety bug in LowRedundancyBlocks

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.0, 3.3.5
• Fix Version/s: 3.4.0, 3.3.5
• Component/s: namanode
• Labels: pull-request-available
• Target Version/s: 3.4.0, 3.3.5
• Hadoop Flags: Reviewed
• Assignee: Shuyan Zhang
• Reporter: Shuyan Zhang
• Created: 03/Mar/23 06:39
• Updated: 28/Jan/24 07:14
• Resolved: 06/Mar/23 12:13

Description

The remove method in LowRedundancyBlocks is not protected by synchronized. This method is private and is called by BlockManager. As a result, priorityQueues has the risk of being accessed concurrently by multiple threads.

Issue Links

• links to: GitHub Pull Request #5450
• links to: GitHub Pull Request #5471