1. upgrade log4j to 2.12.1
2. Add 2 new FE config:
'sys_log_delete_age' and default is '7d', for sys log.
'audit_log_delete_age' and default is '30d', for audit log.
it means if a log's last modification time is 7/30 days ago, it will be deleted.
When creating table with OLAP engine, use can specify multi parition columns.
eg:
PARTITION BY RANGE(`date`, `id`)
(
PARTITION `p201701_1000` VALUES LESS THAN ("2017-02-01", "1000"),
PARTITION `p201702_2000` VALUES LESS THAN ("2017-03-01", "2000"),
PARTITION `p201703_all` VALUES LESS THAN ("2017-04-01")
)
Notice that load by hadoop cluster does not support multi parition column table.
