Created
May 8, 2016 08:15
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hdfs scala utils for modified folders
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| import org.apache.hadoop.fs._ | |
| import org.apache.hadoop.conf.Configuration | |
| import scala.collection.mutable.ListBuffer | |
| object HdfsUtil { | |
| val pf = new PathFilter { | |
| override def accept(path: Path): Boolean = { | |
| val name = path.getName | |
| !name.startsWith(".") | |
| } | |
| } | |
| def getNewPaths(fs: FileSystem, path: Path, epochTS: Long): List[Path] = fs.globStatus(path,pf).filter { x => x.getModificationTime > epochTS }.map { x => x.getPath }.toList | |
| def getDirtyHoursAsTupleList(fs: FileSystem, path: Path, epochTS: Long): Set[(String, String)] = getNewPaths(fs, path, epochTS).map { p => (p.getParent.getParent.getName, p.getParent.getName) }.toSet | |
| def getDirtyHoursAsString(fs: FileSystem, path: Path, epochTS: Long): String = getNewPaths(fs, path, epochTS).map { p => (p.getParent.getParent.getName, p.getParent.getName) }.mkString(",") | |
| def getNewestPathByName(fs: FileSystem, path: Path): Long = | |
| { | |
| try { | |
| fs.globStatus(path,pf).maxBy { x => x.getPath.getName }.getPath.getName.toLong | |
| } catch { | |
| //when no previous runs, timestamp will be oldest timestamp. E.g., 0 | |
| case uoe: UnsupportedOperationException => 0 | |
| } | |
| } | |
| def getNewestPathByModificationTime(fs: FileSystem, path: Path): Long = | |
| try { | |
| fs.globStatus(path,pf).maxBy { x => x.getModificationTime }.getModificationTime | |
| } catch { | |
| //when no previous runs, timestamp will be oldest timestamp. E.g., 0 | |
| case uoe: UnsupportedOperationException => 0 | |
| } | |
| def getHadoopFS: FileSystem = FileSystem.get(new Configuration) | |
| def getHadoopFS(conf: Configuration): FileSystem = FileSystem.get(conf) | |
| def comparePathsModifications(fs: FileSystem, dailyPath: Path, hourlyPath: Path): ListBuffer[String] = { | |
| def getParentName(f: FileStatus): String = f.getPath.getParent.getName | |
| def getGrandParentName(f: FileStatus): String = f.getPath.getParent.getParent.getName | |
| def getNameModMap(p: Path, f: FileStatus => String): Map[String, Long] = | |
| fs.globStatus(p,pf).groupBy { f }.map(f => f._1 -> f._2.maxBy { x => x.getModificationTime }.getModificationTime.toLong) | |
| val dailyfolders1 = getNameModMap(dailyPath, getParentName) | |
| val hourlyFolders = getNameModMap(hourlyPath, getGrandParentName) | |
| val folders = ListBuffer[String]() | |
| for ((k, v) <- hourlyFolders) if (dailyfolders1.getOrElse(k, 0l) < v ) folders append k | |
| folders | |
| } | |
| } |
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