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Posted to common-dev@hadoop.apache.org by "Doug Cutting (JIRA)" <ji...@apache.org> on 2009/05/26 23:23:45 UTC

[jira] Commented: (HADOOP-5892) Implement seek for HftpFileSystem

    [ https://issues.apache.org/jira/browse/HADOOP-5892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713263#action_12713263 ] 

Doug Cutting commented on HADOOP-5892:
--------------------------------------

This isn't really implementing seek(), but rather skip(), since it only goes forward.  Even then, it will be prohibitively slow for large files.

It would be better to implement a real seek.  This can be done by having the seek method close the existing connection and open a new connection specifying a start position as a url parameter.  Then change FileDataServlet to pass this parameter along, and StreamFile to perform a seek before reading data.


> Implement seek for HftpFileSystem
> ---------------------------------
>
>                 Key: HADOOP-5892
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5892
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: hftpSeek.txt
>
>
> Support seek in the HftpFileSystem. This is useful for a host of applications that need to access data from a hadoop cluster running a different version of hadoop.

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