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From "Alejandro Fernandez" <afernan...@hortonworks.com>
Subject Re: Review Request 40004: AMBARI-13755. Express Upgrade: Failed to Downgrade Namenode
Date Fri, 06 Nov 2015 02:56:54 GMT

-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/40004/#review105353
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ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/package/scripts/hdfs_namenode.py
(line 104)
<https://reviews.apache.org/r/40004/#comment163916>

    This is the main change in logic, to always use -rollingUpgrade [started|downgrade]



ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py
(line 219)
<https://reviews.apache.org/r/40004/#comment163915>

    We can't call conf-select when downgrading on EU because the symlinks were already unlinked,
so that /etc/hadoop/conf is now a flat dir.



ambari-server/src/main/resources/stacks/HDP/2.1/upgrades/nonrolling-upgrade-2.3.xml 
<https://reviews.apache.org/r/40004/#comment163911>

    This is not being used.



ambari-server/src/main/resources/stacks/HDP/2.2/upgrades/nonrolling-upgrade-2.2.xml 
<https://reviews.apache.org/r/40004/#comment163912>

    This is not being used.



ambari-server/src/main/resources/stacks/HDP/2.2/upgrades/nonrolling-upgrade-2.3.xml 
<https://reviews.apache.org/r/40004/#comment163913>

    This is not being used.



ambari-server/src/main/resources/stacks/HDP/2.3/upgrades/nonrolling-upgrade-2.3.xml 
<https://reviews.apache.org/r/40004/#comment163914>

    This is not being used.


- Alejandro Fernandez


On Nov. 6, 2015, 2:52 a.m., Alejandro Fernandez wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/40004/
> -----------------------------------------------------------
> 
> (Updated Nov. 6, 2015, 2:52 a.m.)
> 
> 
> Review request for Ambari, Dmitro Lisnichenko, Jayush Luniya, Nate Cole, and Swapan Shridhar.
> 
> 
> Bugs: AMBARI-13755
>     https://issues.apache.org/jira/browse/AMBARI-13755
> 
> 
> Repository: ambari
> 
> 
> Description
> -------
> 
> Setup:
> 
> * Express Upgrade on HDP 2.2.6.0 -> HDP 2.3.0.0
> * Services: HDFS + ZK
> * Upgrade completes successfully
> * Downgrade after reaching Finalize Upgrade
> * Downgrade blocked at Namenode restart
> 
> This is happening because the downgrade command to HDFS needs to coincide with the same
command that was used to upgrade it.
> HDFS supports two types of upgrades:
> 1. -rollingUpgrade started (allows downgrading so that there is no data loss. Downgrade
is either "-rollingUpgrade started" or "-rollingUpgrade downgrade")
> 2. -upgrade (only allows rollback, so any data that was added since the upgrade will
be lost. Rollback is done with "-rollback" command).
> 
> Because Express Upgrade will support only these paths, we will use option 1 for all cases.
> HDP 2.1->2.3 (only upgrade)
> HDP 2.2->2.3 (both upgrade and downgrade)
> HDP 2.2->2.2.* (both upgrade and downgrade)
> HDP 2.3->2.3.* (both upgrade and downgrade)
> 
> 
> Diffs
> -----
> 
>   ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/package/scripts/hdfs_namenode.py
f941164 
>   ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py
ade2ec4 
>   ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/package/scripts/namenode_upgrade.py
c8c057d 
>   ambari-server/src/main/resources/stacks/HDP/2.1/upgrades/nonrolling-upgrade-2.3.xml
0f96d03 
>   ambari-server/src/main/resources/stacks/HDP/2.2/upgrades/nonrolling-upgrade-2.2.xml
3a518cf 
>   ambari-server/src/main/resources/stacks/HDP/2.2/upgrades/nonrolling-upgrade-2.3.xml
d6328dc 
>   ambari-server/src/main/resources/stacks/HDP/2.3/upgrades/nonrolling-upgrade-2.3.xml
2f807fd 
>   ambari-server/src/test/python/stacks/2.0.6/HDFS/test_namenode.py 51ccf59 
> 
> Diff: https://reviews.apache.org/r/40004/diff/
> 
> 
> Testing
> -------
> 
> Tested in the following scenarios.
> HDP 2.1->2.3:
>  Express Upgrade: setup with and without HA
> 
> HDP 2.2->2.3:
>   Express Upgrade: setup with and without HA, followed upgrade and then downgrade.
>   Rolling Upgrade: setup with HA, followed upgrade and then downgrade.
> 
> 
> Thanks,
> 
> Alejandro Fernandez
> 
>


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