[jira] [Created] (AMBARI-13723) Express Upgrade: HDP 2.1->2.3 must uninstall 2.1 bits before starting on 2.3

["Alejandro Fernandez (JIRA)" <ji...@apache.org>]

Alejandro Fernandez created AMBARI-13723:
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             Summary: Express Upgrade: HDP 2.1->2.3 must uninstall 2.1 bits before starting on 2.3
                 Key: AMBARI-13723
                 URL: https://issues.apache.org/jira/browse/AMBARI-13723
             Project: Ambari
          Issue Type: Story
          Components: ambari-server
    Affects Versions: 2.2.0, 2.1.3
            Reporter: Alejandro Fernandez
            Assignee: Alejandro Fernandez
             Fix For: 2.2.0, 2.1.3


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




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