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Date: Mon, 2 Jun 2008 16:21:45 -0700 (PDT)
From: "Tsz Wo (Nicholas), SZE (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3177) Expose DFSOutputStream.fsync API
 though the FileSystem interface
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    [ https://issues.apache.org/jira/browse/HADOOP-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601786#action_12601786 ] 

Tsz Wo (Nicholas), SZE commented on HADOOP-3177:
------------------------------------------------

The class for the wrapperStream is OutputStream.  I think it should be java.io.FileOutputStream since we are doing FileSystem.  Then, the new method FSDataOutputStream.fsync() just has to call wrapperStream.getFD().sync().  This will work for all FileSystem

For DFS, we need to define a new class, say DfsFileDescriptor, extending java.io.FileDescriptor and make DfsFileDescriptor.sync() calls DFSOutputStream.fsync().

For other FileSystem subclass, if getFD() is not defined, we could throw IOException("not supported").

> Expose DFSOutputStream.fsync API though the FileSystem interface
> ----------------------------------------------------------------
>
>                 Key: HADOOP-3177
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3177
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> 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.

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