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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-2284) Confusing/inconsistent PartitioningStrategy
Date Mon, 03 Apr 2017 12:20:41 GMT

     [ https://issues.apache.org/jira/browse/FLINK-2284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aljoscha Krettek updated FLINK-2284:
------------------------------------
    Component/s:     (was: Streaming)
                 DataStream API

> Confusing/inconsistent PartitioningStrategy
> -------------------------------------------
>
>                 Key: FLINK-2284
>                 URL: https://issues.apache.org/jira/browse/FLINK-2284
>             Project: Flink
>          Issue Type: Bug
>          Components: DataStream API
>    Affects Versions: 0.9
>            Reporter: Stephan Ewen
>
> The PartitioningStrategy in {{org.apache.flink.streaming.runtime.partitioner.StreamPartitioner.java}}
is non standard and not easily understandable.
> What form of partitioning is `SHUFFLE`? Shuffle just means "redistribute", it says nothing
about what it does. Same with `DISTRIBUTE`. Also `GLOBAL` is not a well-defined/established
term. Why is `GROUPBY` a partition type? Doesn't grouping simply hash partition (like I assume
"SHUFFLE" means), so why does it have an extra entry?
> Sticking with principled and established names/concepts is important to allow people
to collaborate on the code. 
> Why not stick with the partitioning types defined in the batch API? They are well defined
and named:
> ```
> NONE, FORWARD, RANDOM, HASH, RANGE, FORCED_REBALANCE, BROADCAST, CUSTOM
> ```



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