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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2021/09/17 09:41:42 UTC

[GitHub] [iotdb] zyk990424 opened a new pull request #3996: [IOTDB-1703] Fix MManager slow recover with tag

zyk990424 opened a new pull request #3996:
URL: https://github.com/apache/iotdb/pull/3996


   ## Description
   
   
   ### Problem
   IoTDB support tagIndex in memory for tag based timeseries query.
   
   Current tagIndex is based on CopyOnWriteArraySet and the time complexity to construct each set is O(n2).
   
   An existing case is that the time for recovering tagIndex for 50000 timeseries with tags costs 5min or even more, based on working environment.
   
   ### Solution
   
   Replace CopyOnWriteArraySet usage with Collections.synchronizedSet(new HashSet()) and the time cost is only 2s on my laptop.
   
   


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[GitHub] [iotdb] HTHou merged pull request #3996: [To rel/0.12][IOTDB-1703] Fix MManager slow recover with tag

Posted by GitBox <gi...@apache.org>.

HTHou merged pull request #3996:
URL: https://github.com/apache/iotdb/pull/3996


   


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