cluster-computing

问题 I'm setting up clustering/replication on Tomcat 7 on my local machine, to evaluate it for use with my environment/codebase. Setup I have two identical tomcat servers in sibling directories running on different ports. I have httpd listening on two other ports and connecting to the two tomcat instances as VirtualHosts. I can access and interact with both environments on the configured ports; everything is working as expected. The tomcat servers have clustering enabled like this, in server.xml:

问题 BASIC PROBLEM: I want to submit N + 1 jobs to an LSF-managed Linux cluster in such a way that the ( N + 1)-st "wrap-up" job is not run until all the preceding N jobs have finished. EXTRA: If possible , it would be ideal if I could arrange matters so that the ( N + 1)-st ("wrap-up") job receives, as its first argument, a value of 0 (say) if all the previous N jobs terminated successfully, and a value different from 0 otherwise. This problem (or at least the part labeled "BASIC PROBLEM") is

问题 BASIC PROBLEM: I want to submit N + 1 jobs to an LSF-managed Linux cluster in such a way that the ( N + 1)-st "wrap-up" job is not run until all the preceding N jobs have finished. EXTRA: If possible , it would be ideal if I could arrange matters so that the ( N + 1)-st ("wrap-up") job receives, as its first argument, a value of 0 (say) if all the previous N jobs terminated successfully, and a value different from 0 otherwise. This problem (or at least the part labeled "BASIC PROBLEM") is

问题 BASIC PROBLEM: I want to submit N + 1 jobs to an LSF-managed Linux cluster in such a way that the ( N + 1)-st "wrap-up" job is not run until all the preceding N jobs have finished. EXTRA: If possible , it would be ideal if I could arrange matters so that the ( N + 1)-st ("wrap-up") job receives, as its first argument, a value of 0 (say) if all the previous N jobs terminated successfully, and a value different from 0 otherwise. This problem (or at least the part labeled "BASIC PROBLEM") is

问题 What's the meaning of the title "Locality Level" and the 5 status Data local --> process local --> node local --> rack local --> Any? 回答1: The locality level as far as I know indicates which type of access to data has been performed. When a node finishes all its work and its CPU become idle, Spark may decide to start other pending task that require obtaining data from other places. So ideally, all your tasks should be process local as it is associated with lower data access latency. You can

问题 I'm using the cluster module for nodejs . Here is how I have it set up: var cluster = require('cluster'); if (cluster.isMaster) { var numCPUs = require('os').cpus().length; for (var i = 0; i < numCPUs; i++) { cluster.fork(); } }else{ console.log("Turkey Test"); } Now, I am forking 6 threads (6 cores) on my PC. So, when debugging my app and reading data from the console, this will appear: Is there anyway to make console.log output only once regardless of how many clusters are running? 回答1: You

问题 When use Spark-submit in cluster mode(yarn-cluster),jars and packages configuration confused me: for jars, i can put them in HDFS, instead of in local directory . But for packages, because they build with Maven, with HDFS,it can't work. my way like below: spark-submit --jars hdfs:///mysql-connector-java-5.1.39-bin.jar --driver-class-path /home/liac/test/mysql-connector-java-5.1.39/mysql-connector-java-5.1.39-bin.jar --conf "spark.mongodb.input.uri=mongodb://192.168.27.234/test.myCollection2

问题 I'm aware that on hazelcast editions comparison page: https://hazelcast.com/pricing/ it is clearly specified that WAN replication is only for enterprise edition. But, on the other hand, this hazelcast documentation is divided into two parts: https://docs.hazelcast.org/docs/latest/manual/html-single/#wan Only the second part is explicit about enterprise edition, making one assume that the first part refers to non enterprise edition. I also noticed that the parameters are a bit diferent between

问题 I'm aware that on hazelcast editions comparison page: https://hazelcast.com/pricing/ it is clearly specified that WAN replication is only for enterprise edition. But, on the other hand, this hazelcast documentation is divided into two parts: https://docs.hazelcast.org/docs/latest/manual/html-single/#wan Only the second part is explicit about enterprise edition, making one assume that the first part refers to non enterprise edition. I also noticed that the parameters are a bit diferent between

问题 I have a network of brokers with the following configuration <transportConnectors> <transportConnector name="tomer-amq-test2" uri="tcp://0.0.0.0:61616" updateClusterClients="true" rebalanceClusterClients="true" updateClusterClientsOnRemove="true"/> </transportConnectors> I expect that when I connect using the URL failover:\(tcp://tomer-amq-test2:61616\)?backup=true the broker shall update th client with the full list of brokers it is conencted too, and the client shall connect to one randomly