Alejandro Fernandez created AMBARI-20490:
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Summary: Optimizations for EU on large-scale clusters
Key: AMBARI-20490
URL: https://issues.apache.org/jira/browse/AMBARI-20490
Project: Ambari
Issue Type: Bug
Components: ambari-server
Affects Versions: 2.4.0
Reporter: Alejandro Fernandez
Assignee: Alejandro Fernandez
Fix For: 3.0.0, 2.5.0
On large-scale clusters over 1000 nodes, performance during Express Upgrade can
be very slow and it takes more time to fix potential errors.
We can remedy these with the following fixes:
* "hdp-select set all" is currently ran in the ClusterGroup with a single stage
instead of batching. This can cause Ambari Server to be the bottleneck when
processing 1000+ requests. Allow the execute-stage inside a ClusterGroup to use
batching.
* If some hosts have symlinks or dirs that don't belong in /usr/hdp/ then it
will prevent the hosts from running "hdp-select versions". We can find these
problematic hosts with an alert.
* There is currently no upgrade path from HDP 2.2 directly to 2.5. Doing a
2-step upgrade is very time consuming.
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