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https://issues.apache.org/jira/browse/TEZ-841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hitesh Shah resolved TEZ-841.
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Resolution: Duplicate
> Changes interfaces to abstract classes
> --------------------------------------
>
> Key: TEZ-841
> URL: https://issues.apache.org/jira/browse/TEZ-841
> Project: Apache Tez
> Issue Type: Task
> Affects Versions: 0.4.0
> Reporter: Bikas Saha
> Assignee: Thomas Jungblut
> Labels: newbie
> Attachments: TEZ-841_1.patch
>
>
> Some interfaces like VertexManagerPlugin/EdgeManager/Input/Output/Processor
> are meant to be implemented by users. If they are abstract classes instead of
> interfaces then we may be able to add optional new methods without breaking
> existing impls. Also, some common functionality may be added to the abstract
> classes to make the developers lives easier.
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