Wei-Chiu Chuang created HBASE-26032: ---------------------------------------
Summary: Make HRegion.getStores() an O(1) operation Key: HBASE-26032 URL: https://issues.apache.org/jira/browse/HBASE-26032 Project: HBase Issue Type: Improvement Reporter: Wei-Chiu Chuang Assignee: Wei-Chiu Chuang Attachments: Screen Shot 2021-06-24 at 3.56.33 PM.png This is a relatively minor issue, but I did spot HRegion.getStores() popping up in my profiler. Checking the code, I realized that HRegion.getStores() allocates a new array list in it, converting the Collection<> to List<>. But it also makes it an O( n ) in space and time complexity. This conversion appears mostly unnecessary, because we only iterate the stores in production code, and so the new ArrayList object is thrown away immediately. Only in a number of test code where we index into the stores. -- This message was sent by Atlassian Jira (v8.3.4#803005)