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From "Justin Bertram (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ARTEMIS-517) Provide public API method to check whether backup is synchronized with live server
Date Fri, 06 May 2016 21:30:12 GMT

    [ https://issues.apache.org/jira/browse/ARTEMIS-517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15274752#comment-15274752
] 

Justin Bertram commented on ARTEMIS-517:
----------------------------------------

Are you wanting to be able to execute this on the backup server or on the live server or both?

{{org.apache.activemq.artemis.core.server.impl.SharedNothingBackupActivation#isRemoteBackupUpToDate}}
already exists for the backup.  Of course, the traditional management mechanisms won't be
available until the backup actually becomes live.  

For the live server, {{org.apache.activemq.artemis.core.server.impl.Activation#getReplicationManager}}
exists already which (if not null) can be used to invoke {{org.apache.activemq.artemis.core.replication.ReplicationManager#isSynchronizing()}}.
 If that returns {{false}} then you know the live and backup have synced up.

> Provide public API method to check whether backup is synchronized with live server 
> -----------------------------------------------------------------------------------
>
>                 Key: ARTEMIS-517
>                 URL: https://issues.apache.org/jira/browse/ARTEMIS-517
>             Project: ActiveMQ Artemis
>          Issue Type: New Feature
>          Components: Broker
>    Affects Versions: 1.2.0
>            Reporter: Miroslav Novak
>            Assignee: Justin Bertram
>
> If HA is configured with replicated journal then it takes some time to backup to synchronize
with live server.  Once backup is in sync with live then following information appears in
server.log:
> {code}
> 13:20:00,739 INFO  [org.apache.activemq.artemis.core.server] (Thread-3 (ActiveMQ-client-netty-threads-457000966))
AMQ221024: Backup server ActiveMQServerImpl::serverUUID=bc015b34-fd73-11e5-80ca-1b35f669abb8
is synchronized with live-server.
> 13:20:01,500 INFO  [org.apache.activemq.artemis.core.server] (Thread-2 (ActiveMQ-server-org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl$2@41f992ab-83559664))
AMQ221031: backup announced
> {code}
> Reading server logs to see whether backup is in sync is not convenient and user friendly
way. 
> We should provide public API to check state of synchronization. It should be added to
{{Activation}} interface. 
> This method should be implemented for {{SharedNothingBackupActivation}} and also {{SharedNothingLiveActivation}}.



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