hi,all
our company need this funcation. so we add this funcation into apache. and our 
company ??s all old tasks will be switched to incubator-dolphinscheduler system.

process definition need to support parallel or serial choose.
if is serial in dispatch??need to the previous process_instance execute 
complete??next process_instance can to run??

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 in database, table t_ds_process_definition need add 
cloum:is_parallel,serial_command_lengh. sql script need to exec in database.
alter table t_ds_process_definition add is_parallel tinyint default '1' comment 
'0:serial,1:parallel';
alter table t_ds_process_definition add serial_command_lengh bigint default '0' 
comment 'serial exec command lengh';

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