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From "Alejandro Fernandez" <afernan...@hortonworks.com>
Subject Re: Review Request 41273: [DRAFT] AMBARI-14307. RU: Kafka broker restart failed on downgrade from HDP 2.3 to 2.2 due to circular symlink of /etc/hadoop/conf
Date Sun, 13 Dec 2015 22:50:11 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/41273/
-----------------------------------------------------------

(Updated Dec. 13, 2015, 10:50 p.m.)


Review request for Ambari, Dmytro Grinenko, Dmitro Lisnichenko, Jonathan Hurley, Jayush Luniya,
and Nate Cole.


Changes
-------

Got it working. Still need to fix unit tests.


Bugs: AMBARI-14307
    https://issues.apache.org/jira/browse/AMBARI-14307


Repository: ambari


Description
-------

* Ambari 2.2 at hash for AMBARI-14237 (e15d1e0fb3777f79cb473cf5de0f7a6bf30e63bd)
* HDP 2.2.8.0 with HDFS, YARN/MR, ZK, Kafka 
* RU from  to 2.3.4.0 and reach the Finalize screen.
* Then downgrade,

Kafka broker restart failed on downgrade
```
Traceback (most recent call last):
  File \"/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-START/scripts/hook.py\",
line 39, in <module>
    BeforeStartHook().execute()
  File \"/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py\",
line 217, in execute
    method(env)
  File \"/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-START/scripts/hook.py\",
line 36, in hook
    create_topology_script_and_mapping()
  File \"/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-START/scripts/rack_awareness.py\",
line 69, in create_topology_script_and_mapping
    create_topology_mapping()
  File \"/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-START/scripts/rack_awareness.py\",
line 36, in create_topology_mapping
    group=params.user_group) 
  File \"/usr/lib/python2.6/site-packages/resource_management/core/base.py\", line 154, in
__init__
    self.env.run()
  File \"/usr/lib/python2.6/site-packages/resource_management/core/environment.py\", line
158, in run
    self.run_action(resource, action)
  File \"/usr/lib/python2.6/site-packages/resource_management/core/environment.py\", line
121, in run_action
    provider_action()
  File \"/usr/lib/python2.6/site-packages/resource_management/core/providers/system.py\",
line 144, in action_create
    raise Fail(\"Applying %s failed, looped symbolic links found while resolving %s\" % (self.resource,
path))
resource_management.core.exceptions.Fail: Applying Directory['/etc/hadoop/conf'] failed, looped
symbolic links found while resolving /etc/hadoop/conf
Error: Error: Unable to run the custom hook script ['/usr/bin/python2', '/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-START/scripts/hook.py',
'START', '/var/lib/ambari-agent/data/command-2873.json', '/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-START',
'/var/lib/ambari-agent/data/structured-out-2873.json', 'INFO', '/var/lib/ambari-agent/tmp']
```


This failed because /etc/hadoop/conf is now a circular symlink


Diffs (updated)
-----

  ambari-common/src/main/python/resource_management/libraries/functions/conf_select.py 7fd64b5

  ambari-common/src/main/python/resource_management/libraries/script/script.py 398cee8 
  ambari-server/src/main/resources/common-services/KAFKA/0.8.1.2.2/package/scripts/kafka_broker.py
6fcf08a 
  ambari-server/src/main/resources/custom_actions/scripts/install_packages.py 85d0d25 
  ambari-server/src/main/resources/custom_actions/scripts/ru_set_all.py f8b38db 

Diff: https://reviews.apache.org/r/41273/diff/


Testing
-------

PRELIMINARY code review. Still need to test and fix unit tests.

TODO:
1. Fresh install
2. EU from 2.1 to 2.3
3. RU from 2.2 to 2.3, and downgrade
4. RU/EU from 2.2 to 2.2+
5. RU/EU from 2.3 to 2.3+


Thanks,

Alejandro Fernandez


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