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Date: Wed, 21 Nov 2012 18:25:58 +0000 (UTC)
From: "Jing Zhao (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-4213) When the client calls hsync(), allows
 the client to update the file length in the NameNode
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     [ https://issues.apache.org/jira/browse/HDFS-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jing Zhao updated HDFS-4213:
----------------------------

    Attachment: HDFS-4213.002.patch

New patch uploaded to fix the new findbug.
                
> When the client calls hsync(), allows the client to update the file length in the NameNode
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4213
>                 URL: https://issues.apache.org/jira/browse/HDFS-4213
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>    Affects Versions: 3.0.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-4213.001.patch, HDFS-4213.002.patch
>
>
> As per discussion in HDFS-3960 and HDFS-2802, when clients that need strong consistency update the file length at the NameNode, a special sync is required for getting the length of the being written files when snapshots are taken for these files. This jira implements this sync-with-updating-length by 1) calling ClientProtocol#fsync(), and 2) adding a new field to ClientProtocol#fsync() to indicate the length information.

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