WingsGo opened a new issue #2262: [Proposal] Support Dynamic Partition in Doris URL: https://github.com/apache/incubator-doris/issues/2262 ## Background: In some scenarios, when a user creates an Olap table that is range partition by time, the user needs to periodically add and remove partitions to ensure that the data is valid. As a result, adding and removing partitions dynamically can be very useful for users. ## How to Use When create a Olap Table in Doris, users can specify following properties: | Properties | Instructions | Value | | :-----| :----: | :----: | | dynamic_partition.window_timeunit | Dynamic partition units for olap tables | day/week/month | | dynamic_partition.window_end | Dynamic partition end location for olap tables | Integer | | dynamic_partition.template | The prefix partition name template | String | | dynamic_partition.buckets | The number of buckets in a partition | Integer | For example ``` CREATE TABLE `dynamic_partition` ( `olap_date` date NULL COMMENT "", `event_name` varchar(256) NULL COMMENT "", `distinct_id` varchar(36) NULL COMMENT "", `content` varchar(256) NULL COMMENT "" ) ENGINE=OLAP DUPLICATE KEY(`olap_date`, `event_name`, `distinct_id`) PARTITION BY RANGE(`olap_date`) (PARTITION p20191120 VALUES LESS THAN ("2019-11-21"), PARTITION p20191121 VALUES LESS THAN ("2019-11-22")) DISTRIBUTED BY HASH(`distinct_id`) BUCKETS 100 PROPERTIES ( "storage_type" = "COLUMN", "dynamic_partition.timeunit" = "day", "dynamic_partition.end" = 3, "dynamic_partition.format" = "p", "dynamic_partition.buckets" = "100" ); ``` In the example, the user specifies the automatically add partition units of time, and the number of partitions to be created in advance.dynamic_partition.format specifies the prefix of partition name, in this case, take 2019-11-21 as an example, a three-day partition named p20191122, p20191123 and p20191124 will be created in advance, and the number of buckets for each partition will be 100. ## How to realize 1. When create table, FE parse these properties, check if these properties are valid and persistents them to metadata. 2. Once FE starts, create a daemon called DynamicPartitionTask to check all tables properties if they have dynamic_partition property, if the dynamic_partition property is set, FE execute DDL stmt to add partitions. 3. User can set how often the daemon thread execute in fe.conf with key `dynamic_partition_check_interval_seconds`, the default value is 600.
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