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From vinayakum...@apache.org
Subject hadoop git commit: HDFS.7849. Update documentation for enabling a new feature in rolling upgrade ( Contributed by J.Andreina )
Date Thu, 19 Mar 2015 13:37:06 GMT
Repository: hadoop
Updated Branches:
  refs/heads/branch-2 ceb39c1cc -> 786ba9784


HDFS.7849. Update documentation for enabling a new feature in rolling upgrade ( Contributed
by J.Andreina )

(cherry picked from commit 5be5129d93481e9caae6a05b2361c463211a6d55)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/786ba978
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/786ba978
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/786ba978

Branch: refs/heads/branch-2
Commit: 786ba9784dac768c6270933c55b47e66fec0c28f
Parents: ceb39c1
Author: Vinayakumar B <vinayakumarb@apache.org>
Authored: Thu Mar 19 19:05:42 2015 +0530
Committer: Vinayakumar B <vinayakumarb@apache.org>
Committed: Thu Mar 19 19:06:47 2015 +0530

----------------------------------------------------------------------
 hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt                 | 3 +++
 .../hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml        | 9 +++++++++
 2 files changed, 12 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/786ba978/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 9be5da8..2e5e8d1 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -459,6 +459,9 @@ Release 2.7.0 - UNRELEASED
 
     HDFS-7054. Make DFSOutputStream tracing more fine-grained (cmccabe)
 
+    HDFS.7849. Update documentation for enabling a new feature in rolling
+    upgrade ( J.Andreina via vinayakumarb )
+
   OPTIMIZATIONS
 
     HDFS-7454. Reduce memory footprint for AclEntries in NameNode.

http://git-wip-us.apache.org/repos/asf/hadoop/blob/786ba978/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 e7d8698..a62198f 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml
@@ -48,6 +48,15 @@
     In order to upgrade a HDFS cluster without downtime, the cluster must be setup with HA.
   </p>
   <p>
+    If there is any new feature which is enabled in new software release, may not work with
old software release after upgrade.
+    In such cases upgrade should be done by following steps.
+  </p>
+  <ol>
+    <li>Disable new feature.</li>
+    <li>Upgrade the cluster.</li>
+    <li>Enable the new feature.</li>
+  </ol>
+  <p>
     Note that rolling upgrade is supported only from Hadoop-2.4.0 onwards.
   </p>
   <subsection name="Upgrade without Downtime" id="UpgradeWithoutDowntime">


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