DataStax-Examples/dc-latency-checker

This a simple program that can be run to check the difference in latencies between 2 data centers and calculates an ongoing average.Contributor(s): Patrick CallaghanObjectivesObserve the latency difference between nodes in a cluster spanning two different data centers.Project LayoutMain.java - Runs a test with either a 1KB or 5 MB payload.How this WorksRunning Main.java with either a 1KB payload with 1 second pause or 5MB payload with 3 second pause (with -Dfile=bigfile5M -DpauseInSeconds=3) will provide output of latencies in ms. Also MovingAverage.java will calculate the ongoing average.Setup and RunningPrerequisitesJava 8A DSE cluster running across two dcs (at least 2 nodes)Maven to compile and run codeRunning1KB payload testTo run the simple test with a 1KB payload and pause time of 1 second, execute the followingmvn clean compile exec:java -Dexec.mainClass="com.datastax.test.Main" -DcontactPoints=<localdc-ip> -Dlocaldc=<localdc> -Dremotedc=<remotedc>5MB payload testTo use a larger 5MB payload and change the pause time to 3 seconds, add the file and pauseInSeconds arguments, for examplemvn clean compile exec:java -Dexec.mainClass="com.datastax.test.Main" -DcontactPoints=<localdc-ip> -Dlocaldc=<localdc> -Dremotedc=<remotedc> -Dfile=bigfile5M -DpauseInSeconds=3You can add pass any file to simulate your payload.