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The following page has been changed by RaghuAngadi:
http://wiki.apache.org/lucene-hadoop/Hadoop_0%2e14_Upgrade

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  == Upgrade Path ==
  
- We have tested upgrading from 0.12 to 0.14 and 0.13.1 to 0.14. However we 
recommend upgrading to 0.13.1 before this upgrade. Hadoop-0.13 adds an 
important upgrade related feature that is very useful for upgrades like the one 
described here. While upgrading from 0.13, if something badly goes wrong, you 
can always ''rollback'' to pre-upgrade state by installing 0.13 again. See 
[:Hadoop Upgrade: Hadoop Upgrade page] for more information. Upgrading from 
0.11 and earlier version are very similar to upgrading from 0.12, but these 
cases are not extensively tested.
+ We have tested upgrading from 0.12 to 0.14 and 0.13.1 to 0.14. However we 
recommend upgrading to 0.13.1 before this upgrade. Hadoop-0.13 adds an 
important upgrade related feature that is very useful for upgrades like the one 
described here. While upgrading from 0.13, if something badly goes wrong, you 
can always ''rollback'' to pre-upgrade state by installing 0.13 again. See 
[:Hadoop Upgrade: Hadoop Upgrade page] for more information. Upgrading from 
0.11 or earlier versions is very similar to upgrading from 0.12 and is expected 
to work, though not extensively tested.
  
  == Brief Upgrade Procedure ==
  

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