Issue #8779: Task started on removed worker - Pulp

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Issue #8779

closed

Issue #8912: [EPIC] Issues with the traditional tasking system

Task started on removed worker

Added by adam.winberg@smhi.se over 3 years ago. Updated about 3 years ago.

Status:

CLOSED - CURRENTRELEASE

Priority:

Normal

Assignee:

mdellweg

Category:

Sprint/Milestone:

3.15.0

Start date:

Due date:

Estimated time:

Severity:

2. Medium

Version:

Platform Release:

OS:

Triaged:

Yes

Groomed:

Sprint Candidate:

Tags:

Katello

Sprint:

Sprint 101

Quarter:

Description

After a postgres outage a couple of tasks were started on workers which logs claim to have been removed. The tasks then got stuck in a 'waiting' state and I had to cancel them to make them go away.

Logs showing worker being removed:

May 19 10:56:34 lxserv2285 rq[589125]: pulp [None]: pulpcore.tasking.worker_watcher:ERROR: Worker '2961917@lxserv2285' has gone missing, removing from list of workers
May 19 10:56:34 lxserv2285 rq[589125]: pulp [None]: pulpcore.tasking.worker_watcher:ERROR: The worker named 2961917@lxserv2285 is missing. Canceling the tasks in its queue.

Task being started after removal of workers (snippet):

{                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    "pulp_created": "2021-05-19T10:57:17.819927Z",                                                                                                                                                                                                                                  "state": "waiting",                                                                                                                                                                                                                                                             
  "worker": "/pulp/api/v3/workers/4d159eb5-01e4-4750-a921-c5b28c411e4a/",
  }

The worker above is the worker that had been removed.

Any idea why the task was started on a worker that should have been removed from the list of workers?

On RHEL8, with python3-pulpcore-3.11.0-1.el8.noarch

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Updated by adam.winberg@smhi.se over 3 years ago

Sorry, the task output was not complete

{
    "child_tasks": [],
    "created_resources": [],
    "error": null,
    "finished_at": null,
    "logging_cid": "565b8b02bed8467997bc7d1f1a7440e4",
    "name": "pulp_rpm.app.tasks.synchronizing.synchronize",
    "parent_task": null,
    "progress_reports": [],
    "pulp_created": "2021-05-19T10:57:23.076422Z",
    "pulp_href": "/pulp/api/v3/tasks/492ad82e-a55f-46fe-94ad-e017f378d162/",
    "reserved_resources_record": [
        "/pulp/api/v3/remotes/rpm/rpm/3e276c7e-dbf7-4860-b6b1-965dfd188039/",
        "/pulp/api/v3/repositories/rpm/rpm/bed5516d-50ab-4c20-889b-747470e88551/"
    ],
    "started_at": null,
    "state": "waiting",
    "task_group": null,
    "worker": "/pulp/api/v3/workers/4d159eb5-01e4-4750-a921-c5b28c411e4a/"
}

And also the worker details.

{
    "last_heartbeat": "2021-05-19T10:56:34.675050Z",
    "name": "2961917@lxserv2285.smhi.se",
    "pulp_created": "2021-05-03T05:43:18.304676Z",
    "pulp_href": "/pulp/api/v3/workers/4d159eb5-01e4-4750-a921-c5b28c411e4a/"
}

So, since this worker was removed at 10:56:34 how could a task be assigned to it at 10:57:23?

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Updated by ttereshc over 3 years ago

Tags Katello added

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Updated by dkliban@redhat.com over 3 years ago

Priority changed from Normal to High
Triaged changed from No to Yes
Sprint set to Sprint 98

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Updated by dalley over 3 years ago

Severity changed from 2. Medium to 3. High

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Updated by mdellweg over 3 years ago

Parent issue set to #8912

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Updated by rchan over 3 years ago

Sprint changed from Sprint 98 to Sprint 99

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Updated by rchan over 3 years ago

Sprint changed from Sprint 99 to Sprint 100

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Updated by bmbouter over 3 years ago

Status changed from NEW to CLOSED - WONTFIX

Users are recommended to upgrade to the new tasking system as the resolution to this issue. If someone is not able to do that, please comment here with information on why we should reopen the issue.

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#10

Updated by ggainey over 3 years ago

Status changed from CLOSED - WONTFIX to NEW

Reopening - this is considered a blocker for katello/3.18 upgrade-to-pulp3 process, as it has been causing the 2to3 tasks to hang forever. See 1975858 for more details.

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#11

Updated by ggainey over 3 years ago

Priority changed from High to Normal
Severity changed from 3. High to 2. Medium

ggainey wrote:

Reopening - this is considered a blocker for katello/3.18 upgrade-to-pulp3 process, as it has been causing the 2to3 tasks to hang forever. See 1975858 for more details.

After discussion with katello, here's where we are on this:

the current "concerning" reports are only from users experimenting with Pulp3.7/katello3.18, post-2to3-migration
this is not ever going to be a supported environment for major Pulp3 work
- current sequence is pulp3.7/katello3.18/pulp2.21.5, migrate your data using 2to3 migration, upgrade to pulp3.14/katello4.1/no-pulp2 and then do Complicated Stuff
if this problem occurs during 2to3 migration, there is a workaround
- cancel the task(s) and restart migration
- disable parallel-processing of 2to3 if needed

As a result, the priority on this goes way down - this may not be worth fixing for 3.7, and is not a problem in 3.14.

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#12