带有 poll=0 的 Ansible 任务异步不会从任务继续

Question

可翻译版本：4.10.0

我希望在单个主机上使此任务异步。当我使用poll:0时，我本以为它会启动任务并继续前进，但它比不使用async时需要更长的时间。

- name: "setup test databases on cluster"
block:
- name: "generate list of databases"
set_fact:
test_database_list: "{{ test_database_list | default([])+['test_db%02d'| format(item)] }}"
loop: "{{ range(1,10+1,1)| list }}"
- name: "create test database(s) on cluster"
postgresql_db:
name: "{{ item }}"
with_items: "{{ test_database_list }}"
become_user: postgres
- name: "install postgresql extensions"
postgresql_ext:
db: "{{ item[0] }}"
name: "{{ item[1] }}"
with_nested:
- "{{ test_database_list }}"
- - pageinspect
- pg_buffercache
- pg_freespacemap
- pg_prewarm
- pg_stat_statements
- pg_visibility
- pg_trgm
- pgrowlocks
- pgstattuple
become_user: postgres
async: 30
poll: 0
register: postgres_ext_install_status
- ansible.builtin.async_status:
jid: "{{ item.ansible_job_id }}"
loop: "{{ postgres_ext_install_status.results }}"
loop_control:
label: "{{ item.item }}"
register: job_result
until: job_result.finished
retries: 100
delay: 2
- debug:
msg: "{{ item.start }} -- {{ item.end }} -- {{ item.delta }}"
loop: "job_result.results"
loop_control:
label: "{{ item.item.item }}

以下是输出：https://pastebin.com/DTkbbqgR

文档明确指出，poll:0将导致播放从任务中转移，但它会停留在任务中，并在转移到下一个任务之前缓慢地移动每个数据库的每个扩展。

我是否误解了async/poll的使用？

以下示例适用于在单个主机上运行async并使其从任务中转移。

- hosts: localhost
gather_facts: no
tasks:
- name: sleep 10s
command: "sleep 10"
loop: "{{range(3)|list}}"
async: 11
poll: 0

这和我现在做的有什么不同？

编辑：添加了更多代码和链接到结果

Answer 1

使用aync_status并查看时间，例如

- hosts: localhost
gather_facts: false
tasks:
- shell: 'sleep 2 && echo {{ item.0 }}{{ item.1 }}'
with_nested:
- [a, b]
- [1, 2, 3]
async: 30
poll: 0
register: result
- async_status:
jid: "{{ item.ansible_job_id }}"
loop: "{{ result.results }}"
loop_control:
label: "{{ item.item }}"
register: job_result
until: job_result.finished
retries: 100
delay: 2
- debug:
msg: "{{ item.start }} {{ item.end }} {{ item.delta }}"
loop: "{{ job_result.results }}"
loop_control:
label: "{{ item.item.item }}"

给出

PLAY [localhost] ************************************************************
TASK [shell] ****************************************************************
changed: [localhost] => (item=['a', 1])
changed: [localhost] => (item=['a', 2])
changed: [localhost] => (item=['a', 3])
changed: [localhost] => (item=['b', 1])
changed: [localhost] => (item=['b', 2])
changed: [localhost] => (item=['b', 3])
TASK [async_status] *********************************************************
FAILED - RETRYING: [localhost]: async_status (100 retries left).
changed: [localhost] => (item=['a', 1])
changed: [localhost] => (item=['a', 2])
changed: [localhost] => (item=['a', 3])
changed: [localhost] => (item=['b', 1])
changed: [localhost] => (item=['b', 2])
changed: [localhost] => (item=['b', 3])
TASK [debug] ****************************************************************
ok: [localhost] => (item=['a', 1]) => 
msg: 2022-02-23 01:43:53.697183 2022-02-23 01:43:55.703037 0:00:02.005854
ok: [localhost] => (item=['a', 2]) => 
msg: 2022-02-23 01:43:53.987039 2022-02-23 01:43:55.993030 0:00:02.005991
ok: [localhost] => (item=['a', 3]) => 
msg: 2022-02-23 01:43:54.269019 2022-02-23 01:43:56.275290 0:00:02.006271
ok: [localhost] => (item=['b', 1]) => 
msg: 2022-02-23 01:43:54.592526 2022-02-23 01:43:56.601432 0:00:02.008906
ok: [localhost] => (item=['b', 2]) => 
msg: 2022-02-23 01:43:54.880133 2022-02-23 01:43:56.886689 0:00:02.006556
ok: [localhost] => (item=['b', 3]) => 
msg: 2022-02-23 01:43:55.220324 2022-02-23 01:43:57.228616 0:00:02.008292