[HBASE-20509] Put List in HashSet directly without using addAll function to improve performance

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha-1
• Fix Version/s: 3.0.0-alpha-1, 2.3.0, 2.2.1, 2.1.6
• Component/s: Performance
• Hadoop Flags: Reviewed
• Assignee: taiyinglee
• Reporter: taiyinglee
• Created: 30/Apr/18 09:11
• Updated: 26/Aug/19 06:14
• Resolved: 23/Aug/19 22:28

Description

https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html

change

Set<ServerName> serverSet = new HashSet<>();
serverSet.addAll(serverList);

to

Set<ServerName> serverSet = new HashSet<>(serverList);

in

./hbase-server/src/main/java/org/apache/hadoop/hbase/favored/FavoredNodeAssignmentHelper.java