Manoj Samel created SLIDER-1066:
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Summary: Make AM restart during upgrade option - e.g. via a option
to upgrade command
Key: SLIDER-1066
URL: https://issues.apache.org/jira/browse/SLIDER-1066
Project: Slider
Issue Type: Improvement
Affects Versions: Slider 0.80
Reporter: Manoj Samel
During "slider upgrade" command e.g. to add a new component; the slider AM
itself restarts.
One slide use case is deploy a service via slider and create a new component
for every new user of service. New components are added via "slider upgrade" so
existing components (i.e. users) are not impacted by down time. During each
component upgrade the AM also restarts and all existing components have to know
the new AM before they can heartbeat to it.
Per discussions, the AM restart during upgrade is being done to pick up new
Yarn parameters.
However, in this use case, Hadoop cluster yarn parameters are not being
changed; neither are parameters to any of the existing components. Thus the AM
restart in this case seems to provide no benefit - though it brings a small
risk that any issue in AM restart will shut down the entire application (i.e.
impact all running users).
An option should be provided during the upgrade to NOT do AM restart - allowing
users of slider to have a choice.
Filing the improvement Jira per discussion on d-list.
Thanks,
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