[teiid-issues] [JBoss JIRA] Commented: (TEIID-616) Start time of the system could be incorrect in rare cases where processes are brought down and back up

Fri May 22 21:30:56 EDT 2009

    [ https://jira.jboss.org/jira/browse/TEIID-616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12468940#action_12468940 ] 

Steven Hawkins commented on TEIID-616:
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The question is what is system start time supposed to represent.  The point of my first comment is that the previous notion of start time was tied to configuration state.  The concern that Van is expressing is from a user perspective that the current approach may seem to understate our old notion of system start time in a rolling restart scenario where the configuration hasn't changed. 

Without considering configuration state you could track:
eldest process start time
as Larry suggests, propagate the original start time
you could even use use the eldest or propagate the start time from all vms including host controllers

Any one of these could be considered a correct system start time - and they could all be different than what we tracked previously.  The next thing to note is that none of these actually capture if the cluster is viable (such as a queryservice or other essential service failure), just when it was started.  Using it as a measure of availability would also be misleading.   So the broader questions are what do we want the system start time to be and why is it meaningful? 

> Start time of the system could be incorrect in rare cases where processes are brought down and back up
> ------------------------------------------------------------------------------------------------------
>
>                 Key: TEIID-616
>                 URL: https://jira.jboss.org/jira/browse/TEIID-616
>             Project: Teiid
>          Issue Type: Bug
>          Components: AdminApi, Server
>            Reporter: Van Halbert
>            Assignee: Steven Hawkins
>            Priority: Minor
>             Fix For: 6.1.1
>
>
> The system start time is determined by the Eldest Process start time.   This is not a 100% guaranteed to be true in all cases.   In a rare cases where proceses are brought down and backup, the oldest process start time might not represent how long the system had actually been running.

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