[infinispan-issues] [JBoss JIRA] (ISPN-2442) Ability to take site offline needs to be extended to async replication

[Dan Berindei (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573247#comment-13573247 ] 

Dan Berindei commented on ISPN-2442:
------------------------------------

{{SITE_UNREACHABLE}} messages are still ignored for async backup sites, as the backup take-offline policy can only act on individual RPC failures and there is no way to connect a {{SITE_UNREACHABLE}} message to a previous async backup command.

As a compromise, we could make {{SITE_UNREACHABLE}} trigger a failure on all the async backups to that site. To keep the take-offline policy settings independent of the number of caches, we could assign the failure randomly to one of the async backups to that site (or to none of them if one of the sync backups has outstanding requests).

It would be even better to define the site and the take-offline policy at the cache manager level. That way all the {{SITE_UNREACHABLE}} messages will be counted as failures against the same target, and the backup site will be taken offline at the same time for all the caches.

> Ability to take site offline needs to be extended to async replication
> ----------------------------------------------------------------------
>
>                 Key: ISPN-2442
>                 URL: https://issues.jboss.org/browse/ISPN-2442
>             Project: Infinispan
>          Issue Type: Feature Request
>          Components: Cross-Site Replication
>    Affects Versions: 5.2.0.Beta2
>            Reporter: Erik Salter
>
> Currently the site offline implementation only accounts for synchronous caches.  This needs to be extended to asynchronous replication as well.  
> Best case, this avoids wasted cycles and thread resources sending to a dead site.  Worst case this could tie up all OOB threads, which could halt communication in the local site.



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