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From "Lars Francke (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8914) Documentation conflict regarding fail-over of Namenode
Date Mon, 19 Oct 2015 19:24:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14963898#comment-14963898
] 

Lars Francke commented on HDFS-8914:
------------------------------------

I missed the -1, thanks for the heads up. I'll try to upload a new patch soon.

> Documentation conflict regarding fail-over of Namenode
> ------------------------------------------------------
>
>                 Key: HDFS-8914
>                 URL: https://issues.apache.org/jira/browse/HDFS-8914
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: documentation
>    Affects Versions: 2.7.1
>         Environment: Documentation page in live
>            Reporter: Ravindra Babu
>            Assignee: Lars Francke
>            Priority: Trivial
>         Attachments: HDFS-8914.1.patch
>
>
> Please refer to these two links and correct one of them.
> http://hadoop.apache.org/docs/r2.7.1/hadoop-project-dist/hadoop-hdfs/HdfsDesign.html
> The NameNode machine is a single point of failure for an HDFS cluster. If the NameNode
machine fails, manual intervention is necessary. Currently, automatic restart and failover
of the NameNode software to another machine is not supported.
> http://hadoop.apache.org/docs/r2.7.1/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html
> The HDFS High Availability feature addresses the above problems by providing the option
of running two redundant NameNodes in the same cluster in an Active/Passive configuration
with a hot standby. This allows a fast failover to a new NameNode in the case that a machine
crashes, or a graceful administrator-initiated failover for the purpose of planned maintenance.
> Please update hdfsDesign article with same facts to avoid confusion in Reader's mind..



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