[jira] [Commented] (OAK-7854) Add liveliness monitoring for FileStore background operations

["Michael Dürig (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-7854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16660238#comment-16660238 ] 

Michael Dürig commented on OAK-7854:
------------------------------------

I suggest to expose the flush rate via a meter: [https://github.com/mduerig/jackrabbit-oak/commit/1e8330c9694b82a80448535197bb16062b742f2f]

This commit is based on the [https://github.com/mduerig/jackrabbit-oak/commits/OAK-7852-2] branch from OAK-7852. However it would be simple enough to decouple it should we decide on a different approach there.

[~frm], could you have a look?

> Add liveliness monitoring for FileStore background operations  
> ---------------------------------------------------------------
>
>                 Key: OAK-7854
>                 URL: https://issues.apache.org/jira/browse/OAK-7854
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segment-tar
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>            Priority: Major
>             Fix For: 1.10
>
>
> The FileStore background operations are ultimately executed through a {{ScheduledExecutorService}}. In the case this scheduling gets blocked (e.g. because of a deadlock or lock contention in one of its tasks) there is chance of repository corruption. 
> To minimise potential data loss we should implement monitoring endpoints for the vital background operations. This would allow deployments to take action early in case of failures and thus minimise potential data loss and simplify recovery.



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