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CrawlStatistics.scala
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Fri, May 3, 08:40

CrawlStatistics.scala
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package org.warcbase.spark.scripts
import com.google.common.io.Resources
import org.apache.spark.{SparkConf, SparkContext}
import org.warcbase.spark.matchbox.{ExtractLinks, ExtractDomain, RecordLoader}
import org.warcbase.spark.matchbox._
import org.warcbase.spark.rdd.RecordRDD._
object CrawlStatistics {
private val arcPath = Resources.getResource("arc/example.arc.gz").getPath
private val warcPath = Resources.getResource("warc/example.warc.gz").getPath
def numPagesPerCrawl(sc: SparkContext) = {
val a = RecordLoader.loadArc(arcPath, sc)
val b = RecordLoader.loadWarc(warcPath, sc)
val pageCounts = a.union(b)
.keepValidPages()
.map(_.getCrawldate)
.countItems()
println(pageCounts.take(1).mkString)
}
def numLinksPerCrawl(sc: SparkContext) = {
val a = RecordLoader.loadArc(arcPath, sc)
val b = RecordLoader.loadWarc(warcPath, sc)
val linkCounts = a.union(b)
.keepValidPages()
.map(r => (r.getCrawldate.substring(0, 6), ExtractLinks(r.getUrl, r.getContentString)))
.flatMap(r => r._2.map(f => (r._1, f._1, f._2)))
.filter(r => r._2 != null && r._3 != null)
.map(_._1)
.countItems()
println(linkCounts.take(1).mkString)
}
def numPagesByDomain(sc: SparkContext): Unit = {
val a = RecordLoader.loadArc(arcPath, sc)
val b = RecordLoader.loadWarc(warcPath, sc)
val domainCounts = a.union(b)
.keepValidPages()
.map(r => (r.getCrawldate.substring(0, 6), r.getDomain.replaceAll("^\\s*www\\.", "")))
.countItems()
.filter(f => f._2 > 10)
.sortBy(f => (f._1, f._2))
.collect()
println(domainCounts.take(1).mkString)
}
def linkStructure(sc: SparkContext) = {
val linkStructure = RecordLoader.loadArc(arcPath, sc)
.keepValidPages()
.map(r => (r.getCrawldate.substring(0, 6), ExtractLinks(r.getUrl, r.getContentString)))
.flatMap(r => r._2.map(f => (r._1, ExtractDomain(f._1).replaceAll("^\\s*www\\.", ""), ExtractDomain(f._2).replaceAll("^\\s*www\\.", ""))))
.filter(r => r._2 != null && r._3 != null)
.countItems()
.collect()
println(linkStructure.take(1).mkString)
}
def warclinkStructure(sc: SparkContext) = {
val linkStructure = RecordLoader.loadWarc(warcPath, sc)
.keepValidPages()
.map(r => (ExtractDate(r.getCrawldate, ExtractDate.DateComponent.YYYYMM), ExtractLinks(r.getUrl, r.getContentString)))
.flatMap(r => r._2.map(f => (r._1, ExtractDomain(f._1).replaceAll("^\\s*www\\.", ""), ExtractDomain(f._2).replaceAll("^\\s*www\\.", ""))))
.filter(r => r._2 != null && r._3 != null)
.countItems()
.map(r => TupleFormatter.tabDelimit(r))
.collect()
println(linkStructure.take(1).head)
}
def main(args: Array[String]) = {
val master = "local[4]"
val appName = "example-spark"
val conf = new SparkConf()
.setMaster(master)
.setAppName(appName)
val sc = new SparkContext(conf)
try {
numPagesPerCrawl(sc)
numLinksPerCrawl(sc)
numPagesByDomain(sc)
linkStructure(sc)
warclinkStructure(sc)
} finally {
sc.stop()
}
}
}

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