Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/11925#discussion_r57381927
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/HDFSMetadataLog.scala
---
@@ -196,4 +194,107 @@ class HDFSMetadataLog[T: ClassTag](sqlContext:
SQLContext, path: String)
}
None
}
+
+ private def createFileManager(): FileManager = {
+ val hadoopConf = sqlContext.sparkContext.hadoopConfiguration
+ try {
+ new FileContextManager(metadataPath, hadoopConf)
+ } catch {
+ case e: UnsupportedFileSystemException =>
+ logWarning("Could not use FileContext API for managing metadata
log file. The log may be" +
+ "inconsistent under failures.", e)
+ new FileSystemManager(metadataPath, hadoopConf)
+ }
+ }
+}
+
+object HDFSMetadataLog {
+
+ /** A simple trait to abstract out the file management operations needed
by HDFSMetadataLog */
+ trait FileManager {
+ def list(path: Path, filter: PathFilter): Array[FileStatus]
+ def mkdirs(path: Path): Unit
+ def exists(path: Path): Boolean
+ def open(path: Path): FSDataInputStream
+ def create(path: Path): FSDataOutputStream
+ def rename(srcPath: Path, destPath: Path): Unit
+ def deleteOnExit(path: Path): Unit
+ }
+
+ /** Implementation of FileManager using newer FileContext API */
+ class FileContextManager(path: Path, hadoopConf: Configuration) extends
FileManager {
+ private val fc = if (path.toUri.getScheme == null) {
+ FileContext.getFileContext(hadoopConf)
+ } else {
+ FileContext.getFileContext(path.toUri, hadoopConf)
+ }
+
+ override def list(path: Path, filter: PathFilter): Array[FileStatus] =
{
+ fc.util.listStatus(path, filter)
+ }
+
+ override def rename(srcPath: Path, destPath: Path): Unit = {
+ fc.rename(srcPath, destPath)
+ }
+
+ override def mkdirs(path: Path): Unit = {
+ fc.mkdir(path, FsPermission.getDirDefault, true)
+ }
+
+ override def open(path: Path): FSDataInputStream = {
+ fc.open(path)
+ }
+
+ override def create(path: Path): FSDataOutputStream = {
+ fc.create(path, EnumSet.of(CreateFlag.CREATE))
+ }
+
+ override def exists(path: Path): Boolean = {
+ fc.util().exists(path)
+ }
+
+ override def deleteOnExit(path: Path): Unit = {
+ fc.deleteOnExit(path)
+ }
+ }
+
+ /** Implementation of FileManager using older FileSystem API */
+ class FileSystemManager(path: Path, hadoopConf: Configuration) extends
FileManager {
+ private val fs = if (path.toUri.getScheme == null) {
+ FileSystem.get(hadoopConf)
+ } else {
+ FileSystem.get(path.toUri, hadoopConf)
+ }
+
+ override def list(path: Path, filter: PathFilter): Array[FileStatus] =
{
+ fs.listStatus(path, filter)
+ }
+
+ override def rename(srcPath: Path, destPath: Path): Unit = {
+ if (fs.exists(destPath)) {
+ throw new FileAlreadyExistsException(s"File already exists:
$destPath")
+ }
+ fs.rename(srcPath, destPath)
--- End diff --
Yeah, that may be better.
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