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https://issues.apache.org/jira/browse/AMBARI-20490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alejandro Fernandez updated AMBARI-20490:
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Attachment: AMBARI-20490.trunk.patch
> Fixes for Express Upgrade on large-scale clusters: batch execute-stage for
> hdp-select set all, alert for hdp-select versions, EU from HDP 2.2 to 2.5
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
> 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
>
> Attachments: AMBARI-20490.branch-2.4.patch,
> AMBARI-20490.branch-2.5.patch, AMBARI-20490.trunk.patch
>
>
> 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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