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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-879) FileStatus should have the visible length of the file
Date Fri, 08 Jan 2010 23:26:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12798247#action_12798247
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Hairong Kuang commented on HDFS-879:
------------------------------------

> Data Node heartbeat the size.
You meant heatbeat the size to NN or the client?

Before talking about how we do it, I am not convinced why FileStatus needs to provide visible
length & whether it is "under construction"? Isn't it good enough that DFSOutputStream
provides those information?

> FileStatus should have the visible length of the file
> -----------------------------------------------------
>
>                 Key: HDFS-879
>                 URL: https://issues.apache.org/jira/browse/HDFS-879
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>
> Currently, {{FileStatus}} returned by {{DistributedFileSystem.listStatus()}} (which goes
through {{DFSClient.listPath()}} then {{NameNode.getListing()}}) does not have the latest
file length, if the file is still open for write.
> We should make changes in {{DFSClient.listPath()}} to override the length of the file,
if the file is under construction.
> This depends on adding a {{isUnderConstruction}} field in {{FileStatus}}.

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