Hi Jerry,
R
efer to the following links for reference:
http://www.michael-noll.com/blog/2011/08/23/performing-an-hdfs-upgrade-of-an-hadoop-cluster/
http://wiki.apache.org/hadoop/Hadoop_Upgrade
Notes:
1. the hadoop version used in the doc may be different from yours, but they
are good references to
Hi,
1) Is it possible to do an "in-place" migration, while keeping all
data in HDFS safely?
yes. stop the HDFS firstly, then run "start-dfs.sh -upgrade"
2) If it is yes, is there any doc/guidance to do this?
you just want a HDFS upgrade, so I don't think there are some useful doc.
3)
Hi there
We plan to migrate a 30 nodes hadoop 1.0.1
cluster to the version 2.3.0. We don’t have extra machines to setup a separate
new cluster, thus hope to do an “in-place” migration by replacing the
components on the existing computers. So the questions are:
1)
Is it possible to
