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https://issues.apache.org/jira/browse/HDFS-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13817120#comment-13817120
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Vinay commented on HDFS-5478:
-----------------------------
You may need to call following hsync method with UPDATE_LENGTH flag to update
the length in the NameNode.
{code}
((HdfsDataOutputStream) fos).hsync(EnumSet.of(SyncFlag.UPDATE_LENGTH));
{code}
Can you please try this and let us know the result.
> File size reports as zero after writing and calling FSDataOutputStream#hsync()
> ------------------------------------------------------------------------------
>
> Key: HDFS-5478
> URL: https://issues.apache.org/jira/browse/HDFS-5478
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.0.0-alpha
> Environment: RHEL/OEL 6u3
> Reporter: Brett Randall
>
> Using a Java client to write to a FSDataOutputStream. After some data is
> written and hsync() is called, {{hdfs dfs -get /path/to/file}} gets a file
> containing the data written so-far, all good.
> {{hdfs dfs -ls /path/to/file}} however reports a zero-byte file, presumably
> until the stream is closed (it then shows the correct size). Hue File
> Browser (running CDH4) also shows zero bytes until the stream is closed.
> See also
> http://grokbase.com/t/hadoop/hdfs-user/113j63nrce/zero-file-size-after-hsync
> which discusses the same problem.
> After the buffer is flushed it would be good if the reported file size was
> updated.
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