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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3501) Implement a JMX replicationMBean for monitoring of replication.
Date Fri, 11 Sep 2009 15:52:57 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754180#action_12754180

Rick Hillegas commented on DERBY-3501:

Thanks for the great spec, Francois. I have some comments:

o It would be nice to have TOC entries for the following sections: Assumptions, Requirements,
Replication MBean, and Attributes.

o There's a Javadoc entry in the TOC but no corresponding section further down.

o I would recommend changing the names of some of the attributes:

 - Master attributes:

   HostName -> SlaveHostName
   PortNumber -> SlavePortNumber
   LastInstant -> LastLogInstant
   LastShipped -> LastLogChunkShipped

 - Slave attributes:

   HostName -> MasterHostName
   LastInstant -> LastLogInstant
   LastReceived -> LastLogChunkReceived

o In "JMX Client API and ReplicationMBean Access", did you intend for the last line of the
first code block to appear in a bigger font and to be split off from the previous line?

o Could you give us an example of how to use the ping feature?

o I agree that writing a VisualVM plugin for Derby would be very useful. You may have some
idea of how hard that is--I don't! I don't know what the licensing issues are for such a plugin
so I can't say whether this work is even possible for our Apache community. Provided that
there are no intractable licensing issues, I think that this work falls inside the Derby charter--but
other community members may have other opinions.

o Public API - The existing MBeans are documented in our public api in the org.apache.derby.mbeans
package. I think that we should document this new MBean there too.

> Implement a JMX replicationMBean for monitoring of replication.
> ---------------------------------------------------------------
>                 Key: DERBY-3501
>                 URL: https://issues.apache.org/jira/browse/DERBY-3501
>             Project: Derby
>          Issue Type: Improvement
>          Components: JMX
>    Affects Versions:
>            Reporter: Bernt M. Johnsen
>            Assignee: Francois Orsini
>         Attachments: ReplicationMonitoring_JMX_FS_v0_1.html
> Imlement a replicationMBean for monitoring of replication. Example attributes
> - master/slave state
> - replication buffer usage
> - replication network traffic

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