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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4114) Deprecate the BackupNode and CheckpointNode in 2.0
Date Mon, 05 Nov 2012 01:40:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490406#comment-13490406
] 

Konstantin Shvachko commented on HDFS-4114:
-------------------------------------------

> Your argument about efficiency isn't valid given HDFS-1458.

It is. SNN still needs to upload edits. BN does not need to upload anything.

> The BlockScanner argument is a silly one:

Todd, would you please try to keep this more civilized.
It is not an argument, it is an example.

> it has had some bugs

That is my point. BN has some bugs as well, introduced while the code evolved. It is not a
valid reason to remove it.

> How about start deprecating it in 2.0?

I disagree. It is just twisting the same idea. You are deprecating it in the past to remove
it in the present.

There is no alternative to BackupNode as an HA solution without shared storage, besides checkpointing.
I'll look at the test cases listed here.
I will re-purpose HDFS-2064 for 0.23 and submit a patch soon. Starting from Hadoop 0.23 there
is no need for load replicator, as DNs can talk to multiple NameNodes internally.
                
> Deprecate the BackupNode and CheckpointNode in 2.0
> --------------------------------------------------
>
>                 Key: HDFS-4114
>                 URL: https://issues.apache.org/jira/browse/HDFS-4114
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>
> Per the thread on hdfs-dev@ (http://s.apache.org/tMT) let's remove the BackupNode and
CheckpointNode.

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