[MCOL-1162] Document information about auto-restarts Created: 2018-01-15  Updated: 2020-08-25  Resolved: 2018-09-20

Status: Closed
Project: MariaDB ColumnStore
Component/s: Documentation
Affects Version/s: 1.0.12, 1.1.2
Fix Version/s: Icebox

Type: Task Priority: Major
Reporter: Geoff Montee (Inactive) Assignee: Geoff Montee (Inactive)
Resolution: Incomplete Votes: 0
Labels: None

Issue Links:
Relates
relates to MCOL-1161 ColumnStore automatically restarted Closed

 Description   

There are certain cases where ColumnStore will automatically restart. For example, see MCOL-1161. For another example, ColumnStore will also auto-restart if the system is excessively swapping (I believe this swapping threshold is configurable).

These auto-restarts appear to be completely undocumented. We should probably create a new documentation page to document all of the cases where ColumnStore will automatically restart.

The page should probably also say what happens to queries that are running when the system auto-restarts. Are the queries killed and all uncommitted changes are rolled back?

 Comments   
Comment by David Hill (Inactive) [ 2018-01-15 ]

Yes, the process of ColumnStore restarting due to Swap space issues should be documented...

Comment by David Hill (Inactive) [ 2018-09-20 ]

https://mariadb.com/kb/en/library/columnstore-system-monitoring-configuration/#automated-restart-based-on-excessive-swapping

Comment by David Hill (Inactive) [ 2018-09-20 ]

I Documented, please review to see if additional info is required.

Comment by Geoff Montee (Inactive) [ 2018-09-20 ]

This Jira issue wasn't specifically about auto-restarts caused by excessively swapping. MCOL-1161 suggested that restarts could also happen in other scenarios. I'll just go ahead and close this.

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