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.
7
votes
0answers
642 views
Node js 0.10.7: cluster support for udp dgram?
I'm trying to run following node js application as mentioned https://github.com/joyent/node/issues/2194
var util = require("util"),
dgram = require("dgram"),
cluster = require('cluster');
var ...
4
votes
0answers
80 views
Scalability of Apache hama cluster
I am programming for Apache Hama using Hama graph API. I have problem in scalability when running my program in a cluster. The problem is when I increase the number of machines in the cluster I am ...
4
votes
0answers
63 views
PBS non-uniform process request and qstat output
I'm working on a 18 node cluster, running TORQUE/PBS Pro/Open MPI.
Setup - 2 CPUs/node, 12 cores/CPU (so 24 allowable process per node).
If I submit PBS jobs that need an uneven split across the ...
3
votes
0answers
228 views
Error occurring in caret when running on a cluster
I am running the train function in caret on a cluster via doRedis. For the most part, it works, but every so often I get errors at the very end of this nature:
error calling combine function:
...
3
votes
0answers
305 views
H2 Cluster Setup
Since H2 supports clustering and the process is pretty much like:
start servers
use java org.h2.tools.CreateCluster in order to replicate database among the desired cluster
And knowing that ...
3
votes
0answers
715 views
jsf 2 session not replicating on cluster?
I read some question here some days ago that made me understand that a view scoped bean is on the session. Is this right?
I am asking because I have an jsf 2 + seam 3 + cdi app that on a single node ...
3
votes
0answers
247 views
NodeJS|Cluster Are process.send and worker.send blocking? If so, what's the performance?
I have 2 questions.
Are the process.send and worker.send functions blocking? And what is the performance of this type of inter-process communication?
I have a cluster which has the master pushing ...
3
votes
0answers
548 views
Whirr: Cannot connect to Hadoop cluster on EC2 after lauch-cluster
I am new to Whirr and I'm trying to setup a Hadoop cluster on EC2 with Whirr,I have followed the tutorial on Cloudera https://ccp.cloudera.com/display/CDHDOC/Whirr+Installation
Before install Whirr, ...
3
votes
0answers
979 views
How to use JSF2.0 view scope in cluster environment?
I want to use JSF2.0 in cluster environment. I'm building a JPA2.0 + Spring 3.0 + JSF2.0 stack. I know how to replicate session scoped beans. But how to replicate view scoped beans? I plugged view ...
2
votes
0answers
16 views
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 ...
2
votes
0answers
35 views
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 ...
2
votes
0answers
44 views
JPA + Hibernate in a JBoss Cluster
Assume that I have a Scheduled Bean that executes some pooling over a table and deploy it over a JBoss Clustered Domain environment.
1 - Does this Scheduled bean will be deployed in all instances of ...
2
votes
0answers
38 views
Running LevelDB on Lustre filesystem
I am running a piece of code that's based on LevelDB. It works fine in my workstation, but when I deploy it into a cluster (with Lustre file system), the program breaks with an "Invalid argument" ...
2
votes
0answers
83 views
Quartz JobStoreTX instances disappear on cluster recovery
I have configured two Java WARs with quartz schedulers (version 2.2.1) starting with XMLSchedulingProcessorPlugin. Both web applications are also running in a cluster mode (they are deployed in two ...
2
votes
0answers
379 views
Implementation of Affinity propagation in Java code
I've been trying to implement Affinity Propagation in Java for the past week. I did exactly as the original paper by frey and dueck describes yet I do not get good exemplars.
The research paper can ...
2
votes
0answers
232 views
Trouble with Hadoop Native Libraries
Am using
Apache Hadoop 1.0.4
JDK 1.7
CentOS 5.6
When I install Hadoop Cluster with 2-nodes, it runs fine. I am able to see the status through http://:50070 and http://:50030. However when I build ...
2
votes
0answers
36 views
Virtual memory allocation in cluster - line command
I`m running a code on a computer cluster with 24 nodes, 12 processors each one and something about 64Gb memory each node. The commands I'm using to launch it are the following
#!/bin/sh
#PBS -N cclit
...
2
votes
0answers
164 views
HornetQ cluster node consumers
I have a HornetQ standalone cluster with 2 nodes and Mule ESB is configured to connect HornetQ Cluster discovery group.
I wrote a Mule Callback Listener which is consuming messages from HornetQ ...
2
votes
0answers
209 views
tomcat 6 horizontal clustering?
Please don't hesitate to ask for additional resource from me and don't hesitate to edit the question.
My Load Balancing configuration will be,
workers.java_home=C:/Program Files/Java/jdk1.6.0_25
...
2
votes
0answers
238 views
File system syncing/replicating in Java application cluster
I have the following setup:
1+ clustered instances of a client serving (custom web) application
1 instance of a system serving web application that deploys large (100 MB) files used by
the ...
2
votes
0answers
236 views
quartz jobs in a cluster running on wrong node
uI have an application that is clustered in a 2+2 setup where 2 machines are used in alpha product phase, and the other two are used for real customers. all machines are looking at the same database,
...
2
votes
0answers
137 views
How quartz detect nodes fails
My production environment running a java scheduler job using quartz 2.1.4. on weblogic cluster server with 4 machine and only one schedule job execute at one cluster node (node 1) normally for few ...
2
votes
0answers
573 views
Terracotta DSO with spring security THROWS NotSerializableException for SessionRegistryImpl.java
Our application stack is hibernate/ spring / spring security/JSF running inside tomcat 7.
I have downloaded and installed the Open source Terracotta 3.6.2.
We want to configure Terracotta DSO. we ...
2
votes
0answers
67 views
Managing large objects across a cluster.
What kind of architecture should I use for the app below?
In our SAAS app each customer gets a directory of files. These files can be quite large, and need to be read and written to very quickly. ...
2
votes
0answers
313 views
jboss start up with clustering works in one order not the other
I have two clustered jboss nodes for this example I will call them A and B.
If i start node B first and then node A everything works fine and the servers start up in <45 seconds. If I switch the ...
2
votes
0answers
527 views
RabbitMQ loadbalancing and failover with ipvsadm LVS
We have a plateform that uses 2 rabbitmq nodes loadbalanced by a linux LVS (ipvsadm) in front. We have ipvsadm configured with persistent connections and clients with heartbeat. So far so good.
After ...
2
votes
0answers
177 views
How much time does Tomcat take to replicate sessions on redeploy
We have a Tomcat cluster with two instances (version 5.5.25) running on a single machine. We use this to make sure our web page is available and that all sessions survive during redeployment.
We were ...
2
votes
0answers
773 views
Clustering on WebLogic exception on Failover
I deploy an application on a WebLogic 10.3.2 cluster with two nodes, and a load balancer in front of the cluster.
I have set the
<core:init distributable="true" debug="true" />
My Session ...
2
votes
0answers
445 views
Terracotta Web Sessions - dynamically reload configuration and/or change configured webapps on the fly
Is there a way to dynamically reload the Terracotta configuration file without restarting Terracotta and losing Session replication for every web app?
More Info: I'm in charge of about 30 unruly, ...
2
votes
0answers
267 views
checking cluster-wide open files using gfs / clvm
I wonder if it is possible to check if a file has already been opened by another node in the same GFS cluster. For example, fuser command runs cluster-wide in TruCluster. Is it possible to query lock ...
1
vote
0answers
22 views
Datanode appears to work only on the localhost
In my $HADOOP_HOME/etc/hadoop/slaves file,I have
localhost
slave1
slave2
When I start dfs, I see
namenode, datanode on master
datanode on both the slaves
which is correct.
But if I check the ...
1
vote
0answers
29 views
Why I cannot scale openshift cart having an environment variable defined?
I am trying to integrate Hazelcast in Tomcat cartridge (https://github.com/worldline/openshift-cartridge-tomcat). The problem is to retrieve ip:ports of gears of a scalable application. I looked at ...
1
vote
0answers
15 views
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 ...
1
vote
0answers
17 views
Faye clustering multiple nodes NodeJS
I am trying to make a pub/sub infra using faye (nodejs). I wish to know whether horizontal scaling would be possible or not.
One nodejs process will run on single core, so when people are talking ...
1
vote
0answers
18 views
tomcat clustering and load balancing issue
I have web application that is using a configuration file and it is loaded once on application start up in application context
For configuration application also has a administrator panel that ...
1
vote
0answers
10 views
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 ...
1
vote
0answers
54 views
Python: subprocess memory leak
I want to run a serial program on multiple cores at the same time and I need to do that multiple time (in a loop).
I use subprocess.Popen to distribute the jobs on the processors by limiting the ...
1
vote
0answers
10 views
Jobs going in queue on free nodes
I am trying to submit a job on my cluster using qsub but the job seems to be going in queue even when the nodes are free. I had submitted some jobs a couple of days ago using the same job submission ...
1
vote
0answers
31 views
How to move firms depending on universities & resources
I'm working on a little "paper" on Industrial Clusters with net logo and i have some problems in some fields..
The goal of my little model is to have firms that can move depending on the proximity to ...
1
vote
0answers
29 views
Are there systems that are put on the cluster nodes and find each other by using UDP broadcast?
I want to automate the compilation of a list of IP addresses on which I can run the MPI program. I.e. get a list of all available servers automatically.
Are there cluster management systems that are ...
1
vote
0answers
76 views
Statsd Cluster Proxy
I'm trying to set up a Statsd cluster with their cluster proxy. But all i found was their "official" readme file... https://github.com/etsy/statsd/blob/master/docs/cluster_proxy.md
Can someone tell ...
1
vote
0answers
230 views
Apache Kafka consumer client connecting to Apache Zookeeper: EndOfStreamException
I get an error when trying to 'consume' messages from Kafka (2.9.2-0.8.1) with a Zookeer stand-alone (3.4.5). You can see the source code below as well as the error message and logfile from Zookeeper. ...
1
vote
0answers
35 views
What is the best way to reserve a cluster node without submitting a job right away?
I need to reserve a node, then interactively log in and do something, log out and have the reservation expire after N minutes (not right after I log out as it happens when I do this with qlogin). I'm ...
1
vote
0answers
281 views
Run Node.js forked processes in Docker containers
I'm considering using Docker and thus trying to find as much information possible about it's integration with Node.js applications.
In production, my applications run the Node.js cluster module to ...
1
vote
0answers
43 views
How to configure com.datastax.driver.core.Cluster.Initializer from a configuration file
I wanted to know if it's possible to build a com.datastax.driver.core.Cluster.Initializer from a configuration file as mentioned in the API java docs.
Are there any existing implementations that ...
1
vote
0answers
21 views
can I run readonly git slaves behind a loadbalancer?
My servers are querying git very often. I figure multiple read slaves will help.
Can you place git servers behind a load balancer?
On the git/ssh protocol supported.
1
vote
0answers
180 views
Windows Server 2012 MSMQ Issue
I have setup a failover cluster in Windows Server 2012 which contains two nodes. I have used Microsoft MSMQ for communication. If I try the write on the queue remotely using the node name ...
1
vote
0answers
33 views
Mater-master database replication on 5 servers
My current project requires immediate replication between 5 databases. Servers are physically distributed across the globe. Currently we use Redis with one master server installed on another 6th ...
1
vote
0answers
140 views
How to test HornetQ cluster has been setup properly?
I am new to HornetQ, trying to setup a cluster of 2 hornetq instances on my local network. I copied the config file from confif/stand-alone/clustered and use it on both instances :
<configuration ...
1
vote
0answers
224 views
Nodejs+socket.io : Prevent fallback to xhr-polling after reconnect to worker process (cluster module)
I am using cluster module to fork a new worker every time a worker process dies. My node server and client communicate over websockets (socket.io). What I see is that after a worker dies and the ...
