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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/39955/
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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
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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
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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
