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From "Hari A V (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4539) Streaming Edits to a Backup Node.
Date Fri, 17 Dec 2010 07:12:08 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972375#action_12972375
] 

Hari A V commented on HADOOP-4539:
----------------------------------

Hi,
I am pretty new to Hadoop and HDFS. I was curious what happens to an incomplete file write.
1. Namenode Active and Standby running
2. From a client, i started copying 1 GB file
3. Around 500 MB is copied, while Primary Namenode goes down.

Some how, if i make the standby name node to active and make the client to resumbit the request
to the new Active name node, whether file copying will continue from where it is left or it
will restart ?

I am seeing some issues with acquiring of Lease in case of client requesting to the new Active
name node. Can anyone please help me with this ?

> Streaming Edits to a Backup Node.
> ---------------------------------
>
>                 Key: HADOOP-4539
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4539
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 0.21.0
>
>         Attachments: BackupNode.patch, BackupNode.patch, BackupNode.patch, BackupNode.patch,
BackupNode.patch, BackupNode.patch, image001.gif, StreamEditsToBN.pdf, StreamEditsToSNN.htm
>
>
> Currently Secondary name-node acts as mere checkpointer.
> Secondary name-node should be transformed into a standby name-node (SNN). 
> The long term goal is to make it a warm standby. 
> The purpose of this issue is to provide real time streaming of edits to SNN so that it
contained the up-to-date namespace state.

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