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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
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cmdo(1m)																  cmdo(1m)

NAME
cmdo - Execute process on multiple remote Serviceguard nodes. SYNOPSIS
cmdo [[-n node_name]...] [-t timeout] command DESCRIPTION
cmdo will execute a process on a multiple remote Serviceguard nodes and return any output or return value. cmdo is limited in several ways. cmdo is best suited for situations where other remote execution facilities are not available. For a more full featured tool for remote execution within a cluster, see cexec(1m) provided by Distributed Systems Administration Utilities. To use this command, the local user must have the root access role on each of the involved nodes. For more information on Serviceguard access control policies, see the manual, Managing Serviceguard. To use the cmdo command without specifying -n options, the local node must be configured into a Serviceguard cluster. If no -n options are specified, the command will be executed on all available nodes in the cluster. The command will be executed in an environment which matches the local node. All environment variables defined locally will be available on the remote node. Output from stderr and stdout for the remote process will be combined and delivered in one transmission. This command should not be used for interactive commands or commands which will return large quantities of output. Output from each node will be displayed sequentially as the operation is executed on each remote node. Input via stdin is not supported. Killing the cmdo process does not stop any remote executions of the command. cmdo should not be used on any command which may hang without specifying a timeout value. Options And Arguments -t timeout Kill the executed command if it does not exit within the specified timeout (in seconds) -n node_name Serviceguard node to execute command on. If no -n options are specified, all the nodes configured in the cluster are used. command Command to execute on remote node. May be quoted. RETURN VALUE
cmdo returns the following values: 0 Successful completed on all nodes. >0 Command failed on one or more nodes with the specified exit value. EXAMPLES
Execute an 'ls' in a remote directory on all nodes within the cluster. cmdo ls /tmp Execute an 'ls' in a remote directory on two nodes not configured within a Serviceguard cluster. cmdo -n node1 -n node2 ls /tmp AUTHOR
cmdo was developed by HP. SEE ALSO
cexec(1m), cmcp(1m), cmexec(1m), cmsync(1m), cmquerycl(1m), cmviewcl(1m) Requires Optional Serviceguard Software cmdo(1m)
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