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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 23:26:30 GMT


> On Nov. 4, 2015, 11 p.m., Jayush Luniya wrote:
> > ambari-server/src/main/resources/custom_actions/scripts/remove_bits.py, line 46
> > <https://reviews.apache.org/r/39955/diff/2/?file=1116020#file1116020line46>
> >
> >     Instead of hardcoding the list of packages, cant we build the list of packages
similar to how we do for Install Packages from the stack definition? That way it would work
for all OSes.

We don't have a very good way of doing this right now, since it would involve a custom command
to pass in configs.
For the time being, this works. Closing this issue.


- Alejandro


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On Nov. 4, 2015, 11:25 p.m., Alejandro Fernandez wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/39955/
> -----------------------------------------------------------
> 
> (Updated Nov. 4, 2015, 11:25 p.m.)
> 
> 
> Review request for Ambari, Dmytro Grinenko, Dmitro Lisnichenko, Jayush Luniya, Nate Cole,
and Swapan Shridhar.
> 
> 
> Bugs: AMBARI-13723
>     https://issues.apache.org/jira/browse/AMBARI-13723
> 
> 
> Repository: ambari
> 
> 
> Description
> -------
> 
> 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
> -----
> 
>   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
> -------
> 
> Verified during Express Upgrade from HDP 2.1->2.3
> 
> 
> Thanks,
> 
> Alejandro Fernandez
> 
>


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