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https://issues.apache.org/jira/browse/FLINK-14845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16978019#comment-16978019
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Jingsong Lee commented on FLINK-14845:
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[~sewen] Sorry for misunderstanding. What I want to say is forward instead of
pipeline.
As [~ykt836] said, now, we set true to
`StreamGraph.setBlockingConnectionsBetweenChains`, that will set all result
partition type to `BLOCKING`.
We also set false to
`StreamGraph.setAllVerticesInSameSlotSharingGroupByDefault`. Because operators
have separate memory usage.
But your reminder may be a way. We can let source and its forward join to run
co-located in the same slot. In this special case, we can set pipeline shuffle
type and set them into one slot share group.
> Introduce data compression to blocking shuffle.
> -----------------------------------------------
>
> Key: FLINK-14845
> URL: https://issues.apache.org/jira/browse/FLINK-14845
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Network
> Reporter: Yingjie Cao
> Priority: Major
>
> Currently, blocking shuffle writer writes raw output data to disk without
> compression. For IO bounded scenario, this can be optimized by compressing
> the output data. It is better to introduce a compression mechanism and offer
> users a config option to let the user decide whether to compress the shuffle
> data. Actually, we hava implemented compression in our inner Flink version
> and here are some key points:
> 1. Where to compress/decompress?
> Compressing at upstream and decompressing at downstream.
> 2. Which thread do compress/decompress?
> Task threads do compress/decompress.
> 3. Data compression granularity.
> Per buffer.
> 4. How to handle that when data size become even bigger after compression?
> Give up compression in this case and introduce an extra flag to identify if
> the data was compressed, that is, the output may be a mixture of compressed
> and uncompressed data.
>
> We'd like to introduce blocking shuffle data compression to Flink if there
> are interests.
>
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