如果在生成子目录时父目录不存在,我希望HDFS命令失败。当我使用任何FileSystem#mkdirs时,我发现没有引发异常,而是创建了不存在的父目录:
import java.util.UUID
import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.{FileSystem, Path}
val conf = new Configuration()
conf.set("fs.defaultFS", s"hdfs://$host:$port")
val fileSystem = FileSystem.get(conf)
val cwd = fileSystem.getWorkingDirectory
// Guarantee non-existence by appending two UUIDs.
val dirToCreate = new Path(cwd, new Path(UUID.randomUUID.toString, UUID.randomUUID.toString))
fileSystem.mkdirs(dirToCreate)如果没有检查是否存在的繁琐负担,如果父目录不存在,我如何强制HDFS抛出异常?
发布于 2017-12-18 03:44:22
FileSystem应用编程接口不支持这种类型的行为。相反,应该使用FileContext#mkdir;例如:
import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.{FileContext, FileSystem, Path}
import org.apache.hadoop.fs.permission.FsPermission
val files = FileContext.getFileContext()
val cwd = files.getWorkingDirectory
val permissions = new FsPermission("644")
val createParent = false
// Guarantee non-existence by appending two UUIDs.
val dirToCreate = new Path(cwd, new Path(UUID.randomUUID.toString, UUID.randomUUID.toString))
files.mkdir(dirToCreate, permissions, createParent)上面的例子将抛出:
java.io.FileNotFoundException: Parent directory doesn't exist: /user/erip/f425a2c9-1007-487b-8488-d73d447c6f79https://stackoverflow.com/questions/47857456
复制相似问题