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https://issues.apache.org/jira/browse/GERONIMO-4021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12599167#action_12599167
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Viet Hung Nguyen commented on GERONIMO-4021:
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isReachable() uses ICMP echo requests, which aren't always supported by the
destination host. This will lead to an inaccurate assessment of whether or not
the server is online.
> monitoring console takes too long to recognize that a server is offline
> -----------------------------------------------------------------------
>
> Key: GERONIMO-4021
> URL: https://issues.apache.org/jira/browse/GERONIMO-4021
> Project: Geronimo
> Issue Type: Improvement
> Security Level: public(Regular issues)
> Components: monitoring
> Reporter: Viet Hung Nguyen
> Assignee: Viet Hung Nguyen
> Fix For: 2.2
>
>
> Whenever the monitoring plugin attempts to monitor a server that is
> offline/doesn't exist, it takes way too long to load the page. We need to
> reduce this timeout period.
> I suggest that we add a parameter for the admin to set as the "timeout
> period" somewhere in the portlet. By default, we can choose to have this
> timeout parameter be set to 5000 milliseconds.
> We can use the InetAddress class to call isReachable(int timeout) to see if
> the server is online.
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