I'm trying to find an effective way of saving the result of my Spark Job as a csv file. I'm using Spark with Hadoop and so far all my files are saved as part-00000. Any ideas how to make my spark saving to file with a specified file name?
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You call various methods on the RDD that accept functions as parameters. // set up an example -- an RDD of arrays val sparkConf = new SparkConf().setMaster("local").setAppName("Example") val sc = new SparkContext(sparkConf) val testData = Array(Array(1,2,3), Array(4,5,6,7,8)) val testRDD = sc.parallelize(testData, 2) // Print the RDD of arrays. testRDD.collect().foreach(a => println(a.size)) // Us
Combining steps from official Quick Start Guide and Launching Spark on YARN we get: We’ll create a very simple Spark application, SimpleApp.java: /*** SimpleApp.java ***/ import org.apache.spark.api.java.*; import org.apache.spark.api.java.function.Function; public class SimpleApp { public static void main(String[] args) { String logFile = "$YOUR_SPARK_HOME/README.md"; // Should be some file on yo
I installed a cloudera cluster with a vagrant box. I get an error when I launch the following example: hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar grep input output23 'dfs[a-z.]+' I went to check the log in /var/log/hadoop-yarn. There several log file, in yarn-yarn-nodemanager-cdh-master.log, there is the following stackstrace: 2015-06-17 11:42:42,398 INFO SecurityLogger.org
Trying to grasp a basic concept of how distancing with ibeacon (beacon/ Bluetooth-lowenergy/BLE) can work. Is there any true documentation on how far exactly an ibeacon can measure. Lets say I am 300 feet away...is it possible for an ibeacon to detect this? Specifically for v4 &. v5 and with iOS but generally any BLE device. How does Bluetooth frequency & throughput affect this? Can beacon devices
Hey i want to count the amount of data in a certain column in awk. an example dataset is 2 5 8 1 3 7 8 5 9 and I want to count the frequency of the 5 in the second colum. This is what i tried that didn't work { total = 0; for(i=1;i<=NF;i++) { if(i==2) {if($i==5) {total++;} } printf("%s ", total); } }
Is it possible, perhaps using DB-triggers to set a maximum table-size in a postgres DB? For example, say I have a table called: Comments. From the user perspective, this can be done as frequently as possible, but say I only want to store the 100 most recent comments in the DB. So what I want to do is have a trigger that automatically maintains this. I.e. when more than 100 comments are there, it d
I'm trying to do something like this but it doesn't work: Map<String, String> propertyMap = new HashMap<String, String>(); propertyMap = JacksonUtils.fromJSON(properties, Map.class); But the IDE says: Unchecked assignment Map to Map<String,String> What's the right way to do this? I'm only using Jackson because that's what is already available in the project, is there a native Java way of convertin
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