[jira] [Comment Edited] (MESOS-5368) Consider introducing persistent agent ID

["Yan Xu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MESOS-5368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16344190#comment-16344190 ] 

Yan Xu edited comment on MESOS-5368 at 1/29/18 11:27 PM:
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[~vinodkone] It still seems to me that the proposal to tie the current agent ID (and the latest agent symlink) to the entire work_dir is problematic. Even with MESOS-1739 there still exits possibilities for the agent's checkpointed info to lose compatibility with the new configuration. If that happens {{rm -f <meta>/slaves/latest}} is still the cleanest way to discard the state of the "agent" (and not the resources it manages). So we can still end up with the need to clean up the "agent" but keep the metadata for the resources on the host. Of course we should design this in light of the local resource providers.


was (Author: xujyan):
[~vinodkone] It still seems to me that the proposal to tie the current agent ID (and the latest agent symlink) to the entire work_dir is problematic. Even with MESOS-1739 there still exits possibilities for the agent's checkpointed info to lose compatibility with the new configuration. If that happens {{rm -f <meta>/slaves/latest}} is still the cleaned way to discard the state of the "agent" (and not the resources it manages). So we can still end up with the need to clean up the "agent" but keep the metadata for the resources on the host. Of course we should design this in light of the local resource providers.

> Consider introducing persistent agent ID
> ----------------------------------------
>
>                 Key: MESOS-5368
>                 URL: https://issues.apache.org/jira/browse/MESOS-5368
>             Project: Mesos
>          Issue Type: Improvement
>    Affects Versions: 1.2.1, 1.3.0
>            Reporter: Neil Conway
>            Priority: Major
>              Labels: mesosphere
>
> Currently, agent IDs identify a single "session" by an agent: that is, an agent receives an agent ID when it registers with the master; it reuses that agent ID if it disconnects and successfully reregisters; if the agent shuts down and restarts, it registers anew and receives a new agent ID.
> It would be convenient to have a "persistent agent ID" that remains the same for the duration of a given agent {{work_dir}}. This would mean that a given persistent volume would not migrate between different persistent agent IDs over time, for example (see MESOS-4894). If we supported permanently removing an agent from the cluster (i.e., the {{work_dir}} and any volumes used by the agent will never be reused), we could use the persistent agent ID to report which agent has been removed.



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