[GitHub] [incubator-doris] francisoliverlee commented on issue #4824: [fe bug] query information_schema.tables cost 7s, even more

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

francisoliverlee commented on issue #4824:
URL: https://github.com/apache/incubator-doris/issues/4824#issuecomment-719142181


   after some check, it's known to us how this happened.
   ## 1 how to exec the sql between fe and be
   ```
   we user  --------> fe --------------> be --------------------------------------------------------> fe
                     sql           sql plan                            rpc call to get information_schema data from fe
   ```
   when socket between FE and BE for rpc call timeout and BE calling fe, FE would send TCP RST command to BE, BE would retry ( after 1s in default, can be configed for thrift_client_retry_interval_ms ). 
   
   the retry is the COST.
   


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