[jira] [Commented] (OAK-2739) take appropriate action when lease cannot be renewed (in time)

["Julian Reschke (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-2739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14738716#comment-14738716 ] 

Julian Reschke commented on OAK-2739:
-------------------------------------

[~mreutegg] [~egli] [~chetanm] unless I'm missing something, the concept of using a DS wrapper will cause the "instancof MongoDocumentStore" in the DocumentNodeStore not to function properly anymore!

> take appropriate action when lease cannot be renewed (in time)
> --------------------------------------------------------------
>
>                 Key: OAK-2739
>                 URL: https://issues.apache.org/jira/browse/OAK-2739
>             Project: Jackrabbit Oak
>          Issue Type: Task
>          Components: core
>    Affects Versions: 1.2
>            Reporter: Stefan Egli
>            Assignee: Stefan Egli
>              Labels: resilience
>             Fix For: 1.3.4
>
>         Attachments: OAK-2739.patch
>
>
> Currently, in an oak-cluster when (e.g.) one oak-client stops renewing its lease (ClusterNodeInfo.renewLease()), this will be eventually noticed by the others in the same oak-cluster. Those then mark this client as {{inactive}} and start recoverying and subsequently removing that node from any further merge etc operation.
> Now, whatever the reason was why that client stopped renewing the lease (could be an exception, deadlock, whatever) - that client itself still considers itself as {{active}} and continues to take part in the cluster action.
> This will result in a unbalanced situation where that one client 'sees' everybody as {{active}} while the others see this one as {{inactive}}.
> If this ClusterNodeInfo state should be something that can be built upon, and to avoid any inconsistency due to unbalanced handling, the inactive node should probably retire gracefully - or any other appropriate action should be taken, other than just continuing as today.
> This ticket is to keep track of ideas and actions taken wrt this.



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