Hi all:
I'd like to propose issue
1429(https://github.com/apache/incubator-doris/issues/1429), which is to
refactor the process of Alter Table.
The current process of Alter Table has following problems:
1. Slow
Each sub task of an alter job has to wait the current running transaction
to be finished before starting the task.
2. Relation chain with base tablet.
Each new tablet created by alter job has a relation chain with its base
tablet (the base tablet is where history data comes from).
Maintaining this chain make the process very complicated.
3. FINISHING state of Alter job
The Alter Job has a state called FINISHING. The job in FINISHING state
need to wait all current running transactions to be finished before
transferring to FINISHED.
But in some case, FINISHING may last for a very long time.
To solve these problem, I would like to refactor the Alter Table process.
More design details can be seen in Github issue #1429
--
此致！Best Regards
陈明雨 Mingyu Chen
Email:
[email protected]
