Github user greghogan commented on the pull request:
https://github.com/apache/flink/pull/2032#issuecomment-221993882
There is more discussion in the ticket description, but for Gelly the idea
is to keep algorithms small and discrete yet not duplicate computation.
My first take on this merely cached algorithm outputs and if the
configurations were "equal" would use the prior result.
This second take is able to merge configurations which is much more
powerful. We can do this because `DataSet`s are lazily evaluated and we can
replace the old `DataSet` when we want to change how we generate the result. We
"replace" the `DataSet` by actually wrapping it in a proxy class for which the
`MethodHandler` always defers to the replaceable `DataSet`.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
