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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what is different between database clustering and database partitioning

I would like to know what is different between database clustering and database partitioning? As i know there are two types called attributes or record clustering sometimes called partitioning sometimes called fragmentation (i know partitioning…
Dheya Majid
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Java EE Application-scoped variables in a clustered environment (Websphere)?

Is there any easy way in a Java EE application (running on Websphere) to share an object in an application-wide scope across the entire cluster? Something maybe similar to Servlet Context parameters, but that is shared across the cluster. For…
WayneC
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Raspberry Pi cluster, neuron networks and brain simulation

Since the RBPI (Raspberry Pi) has very low power consumption and very low production price, it means one could build a very big cluster with those. I'm not sure, but a cluster of 100000 RBPI would take little power and little room. Now I think it…
jokoon
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Jetty/Tomcat encrypted cookie-based session storage?

Ruby on Rails has supported signed cookie-based sessions for quite some time, with a few encrypted implementations springing up since then. Python and PHP also have implementations. Does such a beast exist for the Java servlet containers Jetty or…
tjdett
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Running slurm script with multiple nodes, launch job steps with 1 task

I am trying to launch a large number of job steps using a batch script. The different steps can be completely different programs and do need exactly one CPU each. First I tried doing this using the --multi-prog argument to srun. Unfortunately, when…
Nils_M
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Run @Scheduled task only on one WebLogic cluster node?

We are running a Spring 3.0.x web application (.war) with a nightly @Scheduled job in a clustered WebLogic 10.3.4 environment. However, as the application is deployed to each node (using the deployment wizard in the AdminServer's web console), the…
Axel Knauf
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Kubernetes- error uploading crisocket: timed out waiting for the condition

I am trying to create a template for a Kubernetes cluster having 1 master and 2 worker nodes. I have installed all the pre-req software and have run the kubeadmn init on my master node. But when i try to run the kubeadmn join which i get as an…
sierralimaa
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Running a binary without a top level script in SLURM

In SGE/PBS, I can submit binary executables to the cluster just like I would locally. For example: qsub -b y -cwd echo hello would submit a job named echo, which writes the word "hello" to its output file. How can I submit a similar job to SLURM.…
highBandWidth
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What is the difference between failover vs high availability?

According to my reading on jboss documentation it says, We define high availability as the ability for the system to continue functioning after failure of one or more of the servers. A part of high availability is failover which we define as…
Techie
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My Spark's Worker cannot connect Master.Something wrong with Akka?

I want to install Spark Standlone mode to a Cluster with my two virtual machines. With the version of spark-0.9.1-bin-hadoop1, I execute spark-shell successfully in each vm. I follow the offical document to make one vm(ip:xx.xx.xx.223) as both…
FatGhosta
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Java 8 MapReduce for distributed computing

It made me happy when I heard about parallelStream() in Java 8, that processes on multiple cores and finally gives back the result within single JVM. No more lines of multithreading code. As far as I understand this is valid for single JVM only. But…
abishkar bhattarai
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Injecting non-serializable application scoped bean as managed property of serializable session scoped bean in a cluster

I have the following managed beans : @ApplicationScoped public class ApplicationBean { // ... } @SessionScoped public class SessionBean implements Serializable { @ManagedProperty("#{applicationBean}") private ApplicationBean…
user3008066
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Mysql cluster for dummies

So what's the idea behind a cluster? You have multiple machines with the same copy of the DB where you spread the read/write? Is this correct? How does this idea work? When I make a select query the cluster analyzes which server has less…
Uffo
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How to tell Condor to dispatch jobs only to machines on the cluster, that have "numpy" installed on them?

I just figured out how to send jobs to be processed on machines on the cluster by using Condor. Since we have a lot of machines and not each of those machines are configured the same, I was wondering: Is it possible to tell condor only to dispatch…
Aufwind
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How can I copy files between pods or between nodes in the kubernetes cluster?

Is this possible inside the kubernetes cluster? All examples I've found are copying from a local disk to a pod or vice versa, or is the only option to copy from node to node, for example over SSH, SCP or with other utilities?
JDev
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