Increase size of 'value' column in sys.operator table

[vitobotta]

Hi, as discussed on Slack this increases the size of the value column of the sys.operator table.
Thanks!

[eik3]

I'm interested in understanding the problem that's being tackled here - I had a look at #mysql-operator in the Kubernetes Slack but didn't find the discussion.
Would you mind sharing where we can find the discussion or describe the problem with the value column size?

[AMecea]

Hi @eik3 ,

Long story short, xtrabackup tool can write a PURGE_GTID longer than 256 characters, see the example below.

For example, a value that overflows a varchar(256).

REPLACE INTO sys_operator.status VALUES ('backup_gtid_purged', '11e5285c-2bb0-11ea-a652-c691ce6e5474:1-176182,215fc1da-2d4b-11ea-b76b-16cb551023a2:1-126,221995c5-2fcf-11ea-92c0-56336a6d6b9f:1-109947,2ed660d8-16c7-11ea-b5e0-9ee33242215a:1-1740694,44aa9c3a-2968-11ea-98f2-e2c8070b618f:1-9466,4892323d-289b-11ea-a3cb-66a14998e5d8:1-59643,79830932-2991-11ea-9de7-a22c2fff612c:1-105173,886b5fe6-0a2b-11ea-b4a2-1e569d296ed3:1-407421,a6a57e6e-2721-11ea-b52b-3a220c4f6ab0:1-104395,ba326e47-0dfc-11ea-9b67-6ad8f55f6ea5:1-245303,cdf9403c-2a88-11ea-80f9-dac0a15d95ce:1-64009,dd8a762c-1395-11ea-8650-726faff0e1df:1-323914,ec2a2236-103f-11ea-bd78-8e12c0794c17:1-361459');

The following query will fail with [ERROR] 1406 Data too long for column 'value' at row 1 and queries before him will not be executed. This will result in a bad cluster configuration, usually with errors like CoMaster in orchestrator when restoring a cluster from a backup or Duplicate entry '458' for key 'PRIMARY'.

The related issue is #446 but is not updated.

The discussion was private on slack, sorry.

[vitobotta]

Hi guys,

sorry @eik3 I should have added some info... but @AMecea explained it better than I would.

@AMecea I just restored my cluster using the 0.3.6 tag and all looks good 👍
No more errors when setting up the first replica nor the additional replicas, and the replication works just fine. Thanks!

[eik3]

Thanks @AMecea for the great explanation, makes sense!