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https://issues.apache.org/jira/browse/YUNIKORN-337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17169821#comment-17169821
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Wilfred Spiegelenburg commented on YUNIKORN-337:
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This is a major refactor. We have not decided how and what as yet. We first
need to work out a plan to take this forward.
There is also the complicating factor around the plugin that has not been
described here as yet which we need to take into account.
I short:
The current way the plugin is described and included is left out of the
interface and we should look at a way to correctly integrate and incorporate
that into the shim to core interaction. The current definition only works for a
shim which is deployed with the core as one executable, i.e. the current
k8s-shim and core deployment model. Any change to that currently breaks the
plugins.
> interface message complexity
> ----------------------------
>
> Key: YUNIKORN-337
> URL: https://issues.apache.org/jira/browse/YUNIKORN-337
> Project: Apache YuniKorn
> Issue Type: Improvement
> Components: scheduler-interface
> Reporter: Wilfred Spiegelenburg
> Assignee: Wilfred Spiegelenburg
> Priority: Critical
>
> The current interface allows us to only send one message between a shim and
> the core. This provides us with a really simple way of interactions
> definition.
> The complexity is however hidden in the message itself. Every message serves
> multiple purposes and when the message is received the core and shim need to
> unpack it and process each part separately and for certain parts in a real
> specific order.
> Because the message serves a number of purposes it has a large overhead. This
> might not show up in the code directly as the heavy lifting is done in the
> generated code. It will show up in the amount of data as a message, even if
> it does not have all fields, still needs to be encoded in a way that it
> unpacks correctly on the other side.
> The trade off between having one message with a simple interface or multiple
> more focussed messages with a slightly more complex interface needs to be
> assessed.
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