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---
tags:
- taskflow
references:
- https://docs.openstack.org/taskflow/latest/user/persistence.html
---
Main interface is called Backend.
**prep**
Backend + (Logbook ->) Flow Detail -> Engine -> Storage
**execution**
inspect existing atom details -> find unfinished -> inspect graph -> run atoms
**post exec**
destroy logbook, clear backend
can be configured to keep those things around for any purpose
> Logbook is the authoritive source of run-time state. Logbook written first, then persisted.
Namespace: `taskflow.persistence`.
```
from taskflow.persistence import backends
...
persistence = backends.fetch(conf={
"connection": "mysql",
"user": ...,
"password": ...,
})
logbookj
```
Types:
- memory (connection: memoery)
- files (connection: dir | file)
- https://docs.openstack.org/taskflow/latest/user/persistence.html#id5
- sqlalchemy (connection: mysql | postgres | sqlite)
- zookeper (connection: zookeeper)
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