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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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How to identify a master node in an AWS cluster

I want to make a cluster system within an AWS enterprise. The cluster will have a master node and several slaves. The slaves will connect to the master using a TCP/IP connection. There may be several clusters in our organization's AWS enterprise…
user3923124
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Spark workers and master not communicating (both start without error) in standalone cluster

I have the same question as Spark Clusters: worker info doesn't show on web UI , but I can't seem to figure out what the problem is. In addition to what's written there, there are two extra interesting/useful points: The workers will show up on…
StackOverflow_Name
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How check that Cluster sharding is started properly?

I want to check whether ClusterSharding started on not for one region. Here is the code: def someMethod: { val system = ActorSystem("ClusterSystem", ConfigFactory.load()) val region: ActorRef =…
Cherry
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Storing data under source code, hidden in comments

I have been working with databases for quite a while and have found my sweet spot is in storing the data collected by a shell script, within the shell script itself. Sometimes it'll be single line logs for tracking data in quick projects but other…
codykochmann
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How to integrate Cassandra with Hadoop

I am trying to set up clustered Hadoop and Cassandra. Many sites I've read use a lot of words and concepts I am slowly grasping but I still need some help. I have 3 nodes. I want to set up Hadoop and Cassandra on all 3. I am familiar with Hadoop and…
Ree
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Static variable in Spring session bean on a cluster

I have a Spring bean with scope session and it implements Serializable. My application is deployed on a cluster of 3 nodes. Session replication is enabled in the cluster. One of my variable inside the session scoped bean is static variable. I…
Rakesh
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how to configure cluster address in weblogic

I am configuring cluster which group of managed server in console. I have 2 managed server: Managed_server_name listen_address listen_port ip_address m1 slc001.us.xxx.com 7001 10.1.1.1 m2 …
C.c
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Hazelcast HTTP session replication doesn't replicate anything

i've some problems with hazelcast http session replication feature. I'm trying to deploy a web application with hazelcast http session replication in a pair of tomcat 7.0.54 already in cluster (SimpleTcpCluster with a DeltaManager), running under…
Matteo Bruni
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Beowulf Cluster - Identical users on slave nodes

In relation to building a Beowulf cluster, why is it necessary to create identical users on the slave nodes? If one were to create the users on the slave nodes in a different order to the order in which they were created on the master node, what…
Reis
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Retrieve full JSESSIONID on a Websphere Cluster

In a clustered Websphere environment, I retrieve the JSESSIONID of the current HTTP request using the following code: HttpServletRequest servletRequest = ...; servletRequest.getSession().getId(); From this code, I get the identifier, something like…
LaurentG
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julia on PBS cluster: what to give to addprocs()?

I'm trying to setup a cluster across machines on a PBS managed cluster. I'm perfectly able to compute within one node by saying julia -p 12 (after having reserved one node with 12 CPUs). I understand that to use several machines, I have to add them…
Florian Oswald
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How to submit a cat command to a cluster using qsub and use the pipe correctly

I want to submit several "cat jobs" on the fly to a cluster using qsub. Currently I'm concatenating several files with cat to a single one at the end (using > output_file) at the end of the command. The problem is that qsub takes the > output_file…
biojl
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Is it necessary to execute a task on Hadoop DataNode?

Is this the way Hadoop works? Client submit a MapReducer job/program to NameNode. JobTracker (resides on NameNode) allocates task to the slave task trackers that are running on individual worker machines(date nodes) Each Tasktracker is responsible…
Amit Pal
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Error in locking authority file for parallelisation with qmake

I work with Rscript on a cluster. qmake (a specialized version of GNU-make for the cluster) is used to parallelize jobs on several nodes. But Rscript seems to need to write a Xauthority file and it creates an error when every nodes work in the same…
tmaroilley
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Clustering in Matlab

Hi I am trying to cluster using linkage(). Here is the code I am trying.. Y = pdist(data); Z = linkage(Y); T = cluster(Z,'maxclust',4096); I am getting error as follows The number of elements exceeds the maximum allowed size in MATLAB. Error in…
Nilkanta Sahu
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