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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6307) Support reading on un-closed SequenceFile
Date Tue, 01 Dec 2009 23:41:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784534#action_12784534
] 

Hudson commented on HADOOP-6307:
--------------------------------

Integrated in Hadoop-Common-trunk-Commit #95 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-Common-trunk-Commit/95/])
    . Add a new SequenceFile.Reader constructor in order to support reading on un-closed file.


> Support reading on un-closed SequenceFile
> -----------------------------------------
>
>                 Key: HADOOP-6307
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6307
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: 0.21.0, 0.22.0
>
>         Attachments: c6307_20091124.patch, c6307_20091130.patch, c6307_20091201.patch
>
>
> When a SequenceFile.Reader is constructed, it calls fs.getFileStatus(file).getLen().
 However, fs.getFileStatus(file).getLen() does not return the hflushed length for un-closed
file since the Namenode does not know the hflushed length.  DFSClient have to ask a datanode
for the length last block which is being written; see also HDFS-570.

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