kangpinghuang opened a new issue #2249: add a mechanism for FE to collect the 
table's format statistics
URL: https://github.com/apache/incubator-doris/issues/2249
 
 
   For issue #2245 , in order to be aware of the convert process from 
AlphaRowset to BetaRowset, we need a mechanism to know the process of convert.
   here is my basic design:
   1. when BE report to FE, add fields to indicate how many AlphaRowset and 
BetaRowset there are.
   2. FE collect the total statistics from all BEs, and calcute the the total 
process of convert, and should also provide a api to get the convert process of 
single table.
   3. http api or show proc can be the apis to get the statistics.
   like:
   curl -x GET http://fe_host:fe_http_port/api/format/convert/progress
   curl -x GET 
http://fe_host:fe_http_port/api/format/convert/progress/cluster/db/table_name
   
   show proc "/convert/process";
   show proc "/convert/cluster/db/table_name"

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