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Wei-Chiu Chuang updated HBASE-26032: ------------------------------------ Priority: Minor (was: Major) > 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 > Priority: Minor > 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)