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From "Alejandro Fernandez" <afernan...@hortonworks.com>
Subject Re: Review Request 39955: AMBARI-13723. Express Upgrade: HDP 2.1->2.3 must uninstall 2.1 bits before starting on 2.3
Date Wed, 04 Nov 2015 23:25:20 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/39955/
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(Updated Nov. 4, 2015, 11:25 p.m.)


Review request for Ambari, Dmytro Grinenko, Dmitro Lisnichenko, Jayush Luniya, Nate Cole,
and Swapan Shridhar.


Changes
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Changed text message.


Bugs: AMBARI-13723
    https://issues.apache.org/jira/browse/AMBARI-13723


Repository: ambari


Description
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We found a major flaw in the Express Upgrade from 2.1->2.3. Basically, "hadoop" bin still
points to the old binary because we had to install HDP 2.3 while 2.1 bits still existed.

**Manual Upgrade Instructions:**

* Stop all services using 2.1
* yum erase hadoop hdfs hive … (this will remove scripts /usr/bin/hadoop, /usr/bin/hdfs,
/usr/bin/hive, etc/)
* yum install hadoop_2_3_* hdfs_2_3_* hive_2_3_* (rpm should point /usr/bin/hadoop -> /usr/hdp/current/hadoop-client/bin/hadoop)
* Change the version to 2.3 (hdp-select, conf-select, etc.)
* Start all services, and hence MR Service Check passes with "hadoop" command

**Express Upgrade:**

* Install HDP 2.3 bits. We reused the RU framework that relies on a 2 step process: install
bits, perform upgrade. Hence, /usr/bin/hadoop is still using 2.1 bits
* Stop all services using 2.1
* Change the version to 2.3 (hdp-select, conf-select, etc.)
* Start all services, will fail on MR Service Check because ExecuteHadoop() resource calls
"hadoop" command, which is still pointing to 2.1 bits!

One solution is for the orchestration to remove the 2.1 bits before starting using 2.3.
Uninstalling the 2.1 bits will remove /usr/bin/hadoop, but when we call "hdp-select set hadoop-client
<new_version>" it will create the symlink /usr/bin/hadoop -> /usr/hdp/current/hadoop-client/bin/hadoop


Diffs (updated)
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  ambari-server/src/main/resources/custom_actions/scripts/remove_bits.py PRE-CREATION 
  ambari-server/src/main/resources/stacks/HDP/2.1/upgrades/nonrolling-upgrade-2.3.xml 91d4f64


Diff: https://reviews.apache.org/r/39955/diff/


Testing
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Verified during Express Upgrade from HDP 2.1->2.3


Thanks,

Alejandro Fernandez


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