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Full Discussion: Restart TomEE frequently because URL is not responding
Top Forums Web Development Restart TomEE frequently because URL is not responding Post 303031362 by hicksd8 on Wednesday 27th of February 2019 04:32:05 AM
Old 02-27-2019
Be warned that bumping posts are against the rules on this forum and moderators might sanction you for it.

Which load balancer (LB) are you using??

However, I would be likely to compare the 4 configurations (conf/server.xml) to explore any differences seen. TomEE still uses normal Tomcat Clustering and that needs checking out.

I would be inclined to guess that the LB is not overloading node1, on the contrary, the LB is continuing to send requests to node1 after that node has failed (for some reason). There is a fault (hardware, software or configuration) with node1.

The two minute delay you see to load the page is, in fact, the timeout before the request is successfully delivered to a surviving node. If everything is configured properly, it shouldn't take this long. Furthermore, once the failed node is kicked out of the cluster (until you issue the command for it to rejoin), the LB should know that node1 is dead and no longer send requests to it. You then run on three nodes after failover and all is fine and dandy.

So your problem is that failover is not occurring in an orderly fashion. I would confirm whether node1 is actually joining the cluster at all or you have a cluster of three plus a stand-alone node.

The way it should work is that the four cluster members should know immediately if one of them fails. The failed node gets kicked out. The surviving nodes relay this state to the LB which no longer sends requests to the failed node.

Which LB are you using??

Ref:
Apache TomEE
How to Setup Load Balancing in Tomcat/TomEE with mod_proxy_balancer - Simples Assim
Tomcat Clustering - A Step By Step Guide | MuleSoft
This User Gave Thanks to hicksd8 For This Post:
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LEARN ABOUT SUNOS

clinfo

clinfo(1M)						  System Administration Commands						clinfo(1M)

NAME

       clinfo - display cluster information

SYNOPSIS

       clinfo [-nh]

DESCRIPTION

       The clinfo command displays cluster configuration information about the node from which the command is executed.

       Without	arguments, clinfo returns an exit status of 0 if the node is configured and booted as part of a cluster. Otherwise, clinfo returns
       an exit status of 1.

OPTIONS

       The following options are supported:

       -h	Displays the highest node number allowed to be configured. This is different from the maximum number of nodes supported in a given
		cluster. The current highest configured node number can change immediately after the command returns since new nodes can be dynam-
		ically added to a running cluster.

		For example, clinfo -h might return 64, meaning that the highest number you can use to identify a node is 64. See the Sun  Cluster
		3.0 System Administration Guide for a description of utilities you can use to determine the number of nodes in a cluster.

       -n	Prints the number of the node from which clinfo is executed.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       1	An error occurred.

		This is usually because the node is not configured or booted as part of a cluster.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

SunOS 5.10							    12 Mar 2002 							clinfo(1M)
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