[GitHub] [incubator-doris] decster edited a comment on issue #3382: [Proposal] Memory Optimized Column Storage Engine

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decster edited a comment on issue #3382:
URL: https://github.com/apache/incubator-doris/issues/3382#issuecomment-620355243


   @morningman 
   > Does it allow to update the column which already be flushed to the hard disk?
   
   Do you mean 1: MemTablet migrate to SSD/HDD tablet or 2: ColumnPages flush to hard disk?
   For case 1: we will add partial row update support for disk storage engine, which may be slower.
   For case 2: it's allowed
   
   > What about the recovery process？How to recover the data from WAL?
   
   WAL is just a set of WriteTx files, we load the snapshot, and all the committed WriteTx files after the snapshot version.
   


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