Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/11925#discussion_r57493866
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/HDFSMetadataLog.scala
---
@@ -196,4 +195,148 @@ 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 {
+
+ /** List the files in a path that matches a filter. */
+ def list(path: Path, filter: PathFilter): Array[FileStatus]
+
+ /** Make directory at the give path and all its parent directories as
needed. */
+ def mkdirs(path: Path): Unit
+
+ /** Whether path exists */
+ def exists(path: Path): Boolean
+
+ /** Open a file for reading, or throw exception if it does not exist.
*/
+ def open(path: Path): FSDataInputStream
+
+ /** Create path, or throw exception if it already exists */
+ def create(path: Path): FSDataOutputStream
+
+ /**
+ * Atomically ename path, or throw exception if it cannot be done.
+ * Should throw FileAlreadyExistsException if file already exists.
+ * Should throw FileNotFound exception if the file does not exist.
--- End diff --
nit: `file` -> `destPath`
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