[HDFS-14840] Use Java Conccurent Instead of Synchronization in BlockPoolTokenSecretManager

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.2.0
• Fix Version/s: 3.3.0
• Component/s: hdfs
• Hadoop Flags: Reviewed
• Assignee: David Mollitor
• Reporter: David Mollitor
• Created: 10/Sep/19 21:07
• Updated: 12/Sep/19 03:43
• Resolved: 12/Sep/19 03:43

Description

https://github.com/apache/hadoop/blob/d8bac50e12d243ef8fd2c7e0ce5c9997131dee74/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/security/token/block/BlockPoolTokenSecretManager.java#L40

Instead of synchronizing the entire class, just synchronize the collection.