# MY-012985 A long semaphore wait

**URL:** <https://forums.percona.com/t/my-012985-a-long-semaphore-wait/7371>\
**Category:** Percona Server for MySQL 8.0\
**Created:** [January 7, 2020, 3:25pm UTC](https://forums.percona.com/t/my-012985-a-long-semaphore-wait/7371 "2020-01-07T15:25:15Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![acerola](https://avatars.discourse-cdn.com/v4/letter/a/91b2a8/32.png) [@acerola](https://forums.percona.com/u/acerola)\
**Post date:** [January 7, 2020, 6:27pm UTC](https://forums.percona.com/t/my-012985-a-long-semaphore-wait/7371/3 "2020-01-07T18:27:52Z")

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I created the bug report: [URL][[PS-6756] MY-012985 A long semaphore wait - Percona JIRA](https://jira.percona.com/browse/PS-6756%5B/URL%5D)

I noticed this in the log:

```auto
2019-12-19T08:12:25.030516Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.16-7) Percona Server (GPL), Release 7, Revision 613e312.
2019-12-19T08:12:27.503856Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.18-9) starting as process 175120
2019-12-19T08:12:38.587506Z 1 [System] [MY-011090] [Server] Data dictionary upgrading from version '80016' to '80017'.
2019-12-19T08:12:39.402430Z 1 [System] [MY-013413] [Server] Data dictionary upgrade from version '80016' to '80017' completed.
2019-12-19T08:12:44.208245Z 4 [System] [MY-013381] [Server] Server upgrade from '80016' to '80018' started.
2019-12-19T08:12:49.309843Z 4 [System] [MY-013381] [Server] Server upgrade from '80016' to '80018' completed.

```

The data dictionary upgraded from 80016 to 80017, and not to 80018. Is this normal?

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