[GitHub] [incubator-doris] WingsGo commented on issue #3966: [Proposal]Optimize the memory consumption of TransactionMgr

[GitBox <gi...@apache.org>]

WingsGo commented on issue #3966:
URL: https://github.com/apache/incubator-doris/issues/3966#issuecomment-653489222


   I found that most of memory usage in DatabaseTransactionMgr is a HashMap struct idToFinalStatusTransactionState, following shows that 270W TransactionState object almost cost 50G memory, but some data in TransactionState is useless, so we have no need to save the data.
   
   ```
   Label | Number of Objects | Used Heap Size | Retained Heap Size
   -- | -- | -- | --
   java.util.HashMap$NodeFirst 10 of 2,718,787 objects | 2,718,787 | 130,501,776 | 53,717,135,376
   ```
   


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