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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3177) Expose DFSOutputStream.fsync API though the FileSystem interface
Date Mon, 02 Jun 2008 23:21:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601786#action_12601786
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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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