[jira] [Commented] (HDFS-3092) Enable journal protocol based editlog streaming for standby namenode

["Todd Lipcon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-3092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702147#comment-13702147 ] 

Todd Lipcon commented on HDFS-3092:
-----------------------------------

Hey folks. Is anyone still working on this given that HDFS-3077 has been committed for a year or so and in use at lots of sites? Maybe we should close it as wontfix, given a lot of the original ideas got incorporated into 3077?
                
> Enable journal protocol based editlog streaming for standby namenode
> --------------------------------------------------------------------
>
>                 Key: HDFS-3092
>                 URL: https://issues.apache.org/jira/browse/HDFS-3092
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha, namenode
>    Affects Versions: 0.24.0, 0.23.3
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>         Attachments: ComparisonofApproachesforHAJournals.pdf, JNStates.png, MultipleSharedJournals.pdf, MultipleSharedJournals.pdf, MultipleSharedJournals.pdf, Removingfilerdependency.pdf
>
>
> Currently standby namenode relies on reading shared editlogs to stay current with the active namenode, for namespace changes. BackupNode used streaming edits from active namenode for doing the same. This jira is to explore using journal protocol based editlog streams for the standby namenode. A daemon in standby will get the editlogs from the active and write it to local edits. To begin with, the existing standby mechanism of reading from a file, will continue to be used, instead of from shared edits, from the local edits.

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