Repository: hadoop Updated Branches: refs/heads/trunk e79be0ee1 -> 5be5129d9
HDFS.7849. Update documentation for enabling a new feature in rolling upgrade ( 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/5be5129d Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/5be5129d Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/5be5129d Branch: refs/heads/trunk Commit: 5be5129d93481e9caae6a05b2361c463211a6d55 Parents: e79be0e Author: Vinayakumar B <vinayakum...@apache.org> Authored: Thu Mar 19 19:05:42 2015 +0530 Committer: Vinayakumar B <vinayakum...@apache.org> Committed: Thu Mar 19 19:05:42 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/5be5129d/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 d9e8b9e..ac58c39 100644 --- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt +++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt @@ -764,6 +764,9 @@ 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/5be5129d/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 28649a8..2ad28e1 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">