# What's mean this error in percona logs

**URL:** <https://forums.percona.com/t/whats-mean-this-error-in-percona-logs/2443>\
**Category:** Percona XtraDB Cluster 5.x\
**Created:** [June 14, 2012, 9:55am UTC](https://forums.percona.com/t/whats-mean-this-error-in-percona-logs/2443 "2012-06-14T09:55:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![azigui](https://avatars.discourse-cdn.com/v4/letter/a/cab0a1/32.png) [@azigui](https://forums.percona.com/u/azigui)\
**Post date:** [June 14, 2012, 9:55am UTC](https://forums.percona.com/t/whats-mean-this-error-in-percona-logs/2443/1 "2012-06-14T09:55:15Z")

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Hi,

I don’t know what’s mean this logs errors :  
120614 15:25:55 [ERROR] Slave SQL: Could not execute Delete\_rows event on table pa.AreaType; Cannot delete or update a parent row: a foreign key constraint fails (`pa`.`Area`, CONSTRAINT `fk_Area_AreaType` FOREIGN KEY (`areaTypeId`) REFERENCES `AreaType` (`id`) ON UPDATE CASCADE), Error\_code: 1451; handler error HA\_ERR\_ROW\_IS\_REFERENCED; the event’s master log FIRST, end\_log\_pos 129, Error\_code: 1451  
120614 15:25:55 [Warning] WSREP: RBR event 2 Delete\_rows apply warning: 152, 1925  
120614 15:25:55 [ERROR] WSREP: Failed to apply trx: source: 938778e1-b61c-11e1-0800-00d9733f9bb3 version: 2 local: 0 state: CERTIFYING flags: 1 conn\_id: 1673 trx\_id: 17946 seqnos (l: 364, g: 1925, s: 1924, d: 1906, ts: 1339680355633397546)  
120614 15:25:55 [ERROR] WSREP: Failed to apply app buffer: cæÙO, seqno: 1925, status: WSREP\_FATAL

120614 15:28:23 [Warning] WSREP: Certification failed for TO isolated action: source: 938778e1-b61c-11e1-0800-00d9733f9bb3 version: 2 local: 0 state: MUST\_ABORT flags: 65 conn\_id: 1673 trx\_id: -1 seqnos (l: 4, g: 1930, s: 1929, d: 1929, ts: 1339680357271361415)  
120614 15:28:23 [Warning] WSREP: Certification failed for TO isolated action: source: 938778e1-b61c-11e1-0800-00d9733f9bb3 version: 2 local: 0 state: MUST\_ABORT flags: 65 conn\_id: 1673 trx\_id: -1 seqnos (l: 6, g: 1932, s: 1931, d: 1931, ts: 1339680357309181941)  
120614 15:28:23 [Warning] WSREP: Certification failed for TO isolated action: source: 938778e1-b61c-11e1-0800-00d9733f9bb3 version: 2 local: 0 state: MUST\_ABORT flags: 65 conn\_id: 1673 trx\_id: -1 seqnos (l: 8, g: 1934, s: 1933, d: 1933, ts: 1339680357347609350)

Thx for ur help

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**Author:** ![ayurchen](https://avatars.discourse-cdn.com/v4/letter/a/35a633/32.png) [@ayurchen](https://forums.percona.com/u/ayurchen)\
**Post date:** [June 14, 2012, 11:28am UTC](https://forums.percona.com/t/whats-mean-this-error-in-percona-logs/2443/2 "2012-06-14T11:28:33Z")

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What version of XtraDB cluster are you running?

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**Author:** ![azigui](https://avatars.discourse-cdn.com/v4/letter/a/cab0a1/32.png) [@azigui](https://forums.percona.com/u/azigui)\
**Post date:** [June 15, 2012, 3:38am UTC](https://forums.percona.com/t/whats-mean-this-error-in-percona-logs/2443/3 "2012-06-15T03:38:16Z")

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hi,

This is Percona 5.5.24, the last version

Thx