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Questions tagged [cluster-computing]

A computer cluster is a set of connected systems that work together so that in many respects they can be viewed as a single system.

A computer cluster consists of a set of loosely connected computers that work together so that in many respects they can be viewed as a single system. Cluster management is centralized as opposed to a grid's non-central approach. (wikipedia).

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Can Infinispan be used for comunication between server instances

We are currently using Infinispan for caching data from database which is working fine. Since we are already using Infinspan, I was wondering if it can be used for communication and coordination between application server instances that are running…
user624558
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Configuring Glassfish 4 Cluster without multicast

I'm configuring Glassfish 4 Cluster on DigitalOcean which doesn't allow multicast. I want to deploy an EAR application with one WAR inside and I want all instances on Cluster share session info. The web.xml has the tag. The setup: I have one…
kienvaser
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How to perform clustering based on the edges of a graph?

I have a CSV with the following, x,y,6 y,z,9 y,p,5 x,p,3 here, letters are nodes and numbers are the edges. I drew the graph : Gph = nx.read_edgelist(filepath, delimiter=',', data=[('weight', int)]) G.edges(data=True) edge_labels = dict(((u, v),…
Gworld
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How make a cluster of CoreOS on my local infrastructure?

I have some professional servers, and I want to create a cluster of 7-15 machines with CoreOS. I'm a little familiar with Proxmox, but I'm not clear about how create a virtual machine(VM) with CoreOS on proxmox. Also, I'm not sure if the idea of…
enrique-carbonell
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restore a cassandra cluster from snapshot failed

Hope someone can help. We are having issues restoring all nodes of a cassandra 2.0 cluster from a snapshot. I have reviewed the instructions [Restoring from a snapshot][1] Specific steps done include: All data had been flushed from the…
user3803055
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Infinispan async replication queue - not being used when configured

Objective I have a cluster using Infinispan in embedded + replication mode. Cluster size is just 2 systems. In order to examine the performance gains by using async-replication using replication-queue I experimented a bit whose details are as…
user1511595
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DotNetOpenAuth RelayParty not working on load balanced cluster

We're trying to move an ASP.NET MVC application, which uses DotNetOpenAuth OpenID Version 3.4.1, from a single server web garden to a physical server cluster held behind a hardware load balancer. Our old setup (OpenID RP working): Browser => SHTTP…
Garth
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Spark: how to set worker-specific SPARK_HOME in standalone mode

I'm setting up a [somewhat ad-hoc] cluster of Spark workers: namely, a couple of lab machines that I have sitting around. However, I've run into a problem when I attempt to start the cluster with start-all.sh: namely, Spark is installed in different…
Magsol
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Simple cluster HA singleton

I'm looking for a simple HA singleton implementation in Java. I just need to ensure that there is always exactly 1 instance of service running in a cluster. Is there any stable implementation not based on app server? I thought I could use…
Piotr Gwiazda
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Node.js Cluster + Express always invoke the same worker

I'm trying to use the cluster module to handle multiple http requests concurrently with Express. With the code below I'm able to spawn multiple workers and have all of them listen on the same port. The large for loop is there to simulate heavy load…
user2752402
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Weblogic Managed Servers Restart On Own

We are running WebLogic 8.1.6.0 and when we attempt to shutdown all managed servers in a cluster some of the managed servers shutdown and start back up prior to us interacting with them. In order to stop all of the managed servers we have to manual…
berlebutch
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windows cluster - SSH seems to be failing

Two physical systems, each is running Server 2008 Installed DataStax Community (version 2.0.7 64-bit) on each (that is the version number in the DataStax package I downloaded according to the file name) OpCenter running locally shows a running 1…
user3716377
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Java maximum heap size on SGE cluster

I have a pipeline written in python calling some processes in Java. The pipeline runs with two possible modes, on local mode (on a single node) or on SGE cluster. When I set the option to cluster mode, the error message in the logs are such this…
Rad
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qsub array job - get number of tasks

Is it possible to get the number of tasks for a submitted array job? Like $SGE_TASK_ID for the task number. For example if I submit the job qsub -t 1-4 my_script.sh I'd like to get 4.
Mouagip
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h2 cluster with file based database

I have set up an h2 cluster but cannot connect via the console or using a datasource all I get is this: IO Exception: "java.io.IOException: The filename, directory name, or volume label syntax is incorrect";…
Gurnard
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