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Date: Tue, 19 Jun 2012 00:20:42 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3425) Enable standby namenode to tail
 edits from journal service
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    [ https://issues.apache.org/jira/browse/HDFS-3425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396403#comment-13396403 ] 

Todd Lipcon commented on HDFS-3425:
-----------------------------------

Hey Brandon,

I'm just looking over this quickly, and it seems inelegant that we have a lot of "if (usesJournalService())" type calls. In the code I'm working on, this is all done using the existing interfaces like selectInputStreams() so we don't need to have two implementations of all this code.

I'm also working on the "direct-from-HTTP" loading. I'll try to push my branch to github later, but it's currently in a lot of flux so I don't want to try to separate it out into clean JIRAs before its' a bit farther along. Is that OK?
                
> Enable standby namenode to tail edits from journal service
> ----------------------------------------------------------
>
>                 Key: HDFS-3425
>                 URL: https://issues.apache.org/jira/browse/HDFS-3425
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>         Attachments: HDFS-3425.HDFS-3092.patch, HDFS-3425.HDFS-3092.patch.2
>
>
> In an HA cluster with the journal service configured, namenode should get edit logs from journal service instead of from local or shared storage directories.  
> As one of the first steps towards this goal, this JIRA is to enable standby namenode to tail edits from journal services. 

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