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https://issues.apache.org/jira/browse/SPARK-5042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-5042.
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Resolution: Incomplete
> Updated Receiver API to make it easier to write reliable receivers that ack
> source
> ----------------------------------------------------------------------------------
>
> Key: SPARK-5042
> URL: https://issues.apache.org/jira/browse/SPARK-5042
> Project: Spark
> Issue Type: Improvement
> Components: DStreams
> Reporter: Tathagata Das
> Assignee: Tathagata Das
> Priority: Major
> Labels: bulk-closed
>
> Receivers in Spark Streaming receive data from different sources and push
> them into Spark’s block manager. However, the received records must be
> chunked into blocks before being pushed into the BlockManager. Related to
> this, the Receiver API provides two kinds of store() -
> 1. store(single record) - The receiver implementation submits one
> record-at-a-time and the system takes care of dividing it into right sized
> blocks, and limiting the ingestion rates. In future, it should also be able
> to do automatic rate / flow control. However, there is no feedback to the
> receiver on when blocks are formed thus no way to ensure reliability
> guarantees. Overall, receivers using this are easy to implement.
> 2. store(multiple records)- The receiver submits multiple records and that
> forms the blocks that are stored in the block manager. The receiver
> implementation has full control over block generation, which allows the
> receiver acknowledge source when blocks have been reliably received by
> BlockManager and/or WriteAheadLog. However, the implementation of the
> receivers will not get automatic block sizing and rate controlling; the
> developer will have to take care of that. All this adds to the complexity of
> the receiver implementation.
> So, to summarize, the (2) has the advantage of full control over block
> generation, but the users have to deal with the complexity of generating
> blocks of the right block size and rate control.
> So we want to update this API such that it is becomes easier for developers
> to achieve reliable receiving of records without sacrificing automatic block
> sizing and rate control.
>
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