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HDFS-7934. Update RollingUpgrade rollback documentation: should use bootstrapstandby for standby NN. Contributed by J. Andreina. 

(cherry picked from commit b172d03595)
(cherry picked from commit 725621d95a)
This commit is contained in:
Jing Zhao 2015-04-15 13:10:38 -07:00
parent 9e11ae684a
commit e1ce0700eb
2 changed files with 6 additions and 1 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -23,6 +23,9 @@ Release 2.7.1 - UNRELEASED
HDFS-8151. Always use snapshot path as source when invalid snapshot names HDFS-8151. Always use snapshot path as source when invalid snapshot names
are used for diff based distcp. (jing9) are used for diff based distcp. (jing9)
HDFS-7934. Update RollingUpgrade rollback documentation: should use
bootstrapstandby for standby NN. (J. Andreina via jing9)
Release 2.7.0 - UNRELEASED Release 2.7.0 - UNRELEASED
INCOMPATIBLE CHANGES INCOMPATIBLE CHANGES

4
hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml
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@ -263,14 +263,16 @@
<p> <p>
Rollback from a newer release to the pre-upgrade release is always supported. Rollback from a newer release to the pre-upgrade release is always supported.
However, it cannot be done in a rolling fashion. It requires cluster downtime. However, it cannot be done in a rolling fashion. It requires cluster downtime.
Suppose <em>NN1</em> and <em>NN2</em> are respectively in active and standby states.
Below are the steps for rollback: Below are the steps for rollback:
</p> </p>
<ul> <ul>
<li>Rollback HDFS<ol> <li>Rollback HDFS<ol>
<li>Shutdown all <em>NNs</em> and <em>DNs</em>.</li> <li>Shutdown all <em>NNs</em> and <em>DNs</em>.</li>
<li>Restore the pre-upgrade release in all machines.</li> <li>Restore the pre-upgrade release in all machines.</li>
<li>Start <em>NNs</em> with the <li>Start <em>NN1</em> as Active with the
"<a href="#namenode_-rollingUpgrade"><code>-rollingUpgrade rollback</code></a>" option.</li> "<a href="#namenode_-rollingUpgrade"><code>-rollingUpgrade rollback</code></a>" option.</li>
<li>Run `-bootstrapStandby' on NN2 and start it normally as standby.</li>
<li>Start <em>DNs</em> with the "<code>-rollback</code>" option.</li> <li>Start <em>DNs</em> with the "<code>-rollback</code>" option.</li>
</ol></li> </ol></li>
</ul> </ul>