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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8914) Documentation conflict regarding fail-over of Namenode
Date Mon, 19 Oct 2015 18:42:28 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14963812#comment-14963812
] 

Allen Wittenauer commented on HDFS-8914:
----------------------------------------

The process is relatively simple:

a) contributor submits a patch
b) QA bot does static analysis to cover some of the review work
c) committer reads through patch after QA bot says it is good
d) committer gives a +1 if it is good, -1 or general feedback if it has issues
e) if good, committer commits against source tree for releases that the committer feels it
should be in, etc
f) patch shows up in next release that contains that patch

So even if this were to get committed right this second, it likely won't show up on the website
for a very long time.  Also keep in mind that there are literally hundreds of JIRAs in patch
available state. It can take a while for someone to get to it.

> 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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