[IOTDB-1565] Add sql: set system to readonly/writable

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: master branch, 0.12.2
• Component/s: Core/Engine
• Labels: pull-request-available
• Assignee: Haonan Hou
• Reporter: Jialin Qiao
• Created: 13/Aug/21 07:06
• Updated: 03/Sep/21 01:05
• Resolved: 18/Aug/21 14:39

Description

When upgrading IoTDB, we need to stop insertion and then run flush. These two steps are not very close.

 

It's better to use two sql to accomplish this:

 

set system to readonly

flush

 

So we need two sql: 

set system to readonly

set system to writable

Issue Links

• fixes: IOTDB-1457 ”No space left on device“ causes iotdb system mode is read-only，iotdb does not have to be restarted when the device has available space
• links to: GitHub Pull Request #3764
• links to: GitHub Pull Request #3771
• links to: GitHub Pull Request #3885
• links to: GitHub Pull Request #3894