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From ji...@apache.org
Subject hadoop git commit: HDFS-7934. Update RollingUpgrade rollback documentation: should use bootstrapstandby for standby NN. Contributed by J. Andreina.
Date Wed, 15 Apr 2015 20:10:54 GMT
Repository: hadoop
Updated Branches:
  refs/heads/trunk 4c097e473 -> b172d0359


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


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/b172d035
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/b172d035
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/b172d035

Branch: refs/heads/trunk
Commit: b172d03595d1591e7f542791224607d8c5fce3e2
Parents: 4c097e4
Author: Jing Zhao <jing9@apache.org>
Authored: Wed Apr 15 13:10:38 2015 -0700
Committer: Jing Zhao <jing9@apache.org>
Committed: Wed Apr 15 13:10:38 2015 -0700

----------------------------------------------------------------------
 hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt                      | 3 +++
 .../hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml             | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/b172d035/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 574faa2..60fff16 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -525,6 +525,9 @@ Release 2.7.1 - UNRELEASED
     HDFS-8151. Always use snapshot path as source when invalid snapshot names
     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
 
   INCOMPATIBLE CHANGES

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b172d035/hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml b/hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml
index 2ad28e1..1c3dc60 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml
@@ -263,14 +263,16 @@
   <p>
     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.
+    Suppose <em>NN1</em> and <em>NN2</em> are respectively in active
and standby states.
     Below are the steps for rollback:
   </p>
   <ul>
     <li>Rollback HDFS<ol>
       <li>Shutdown all <em>NNs</em> and <em>DNs</em>.</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>
+      <li>Run `-bootstrapStandby' on NN2 and start it normally as standby.</li>
       <li>Start <em>DNs</em> with the "<code>-rollback</code>"
option.</li>
     </ol></li>
   </ul>


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