[HADOOP-3177] Expose DFSOutputStream.fsync API though the FileSystem interface

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.18.0
• Hadoop Flags: Reviewed

Release Note

Added a new public interface Syncable which declares the sync() operation. FSDataOutputStream implements Syncable. If the wrappedStream in FSDataOutputStream is Syncalbe, calling FSDataOutputStream.sync() is equivalent to call wrappedStream.sync(). Otherwise, FSDataOutputStream.sync() is a no-op. Both DistributedFileSystem and LocalFileSystem support the sync() operation.

• Assignee: Tsz-wo Sze
• Reporter: Dhruba Borthakur
• Created: 04/Apr/08 20:47
• Updated: 08/Jul/09 16:43
• Resolved: 04/Jun/08 17:46

Description

In the current code, there is a DFSOutputStream.fsync() API that allows a client to flush all buffered data to the datanodes and also persist block locations on the namenode. This API should be exposed through the generic API in the org.hadoop.fs.

Issue Links

• blocks: HADOOP-1700 Append to files in HDFS