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https://issues.apache.org/jira/browse/SPARK-9619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tathagata Das updated SPARK-9619:
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Summary: Restarting the receiver's BlockGenerator does not clear previously
buffered data (was: Restarting the receiver's BlockGenerator does clear
previous data)
> Restarting the receiver's BlockGenerator does not clear previously buffered
> data
> --------------------------------------------------------------------------------
>
> Key: SPARK-9619
> URL: https://issues.apache.org/jira/browse/SPARK-9619
> Project: Spark
> Issue Type: Bug
> Components: Streaming
> Reporter: Tathagata Das
> Assignee: Tathagata Das
> Priority: Minor
>
> The internal default block generator that is used by receivers gets reused
> across receiver restarts. This can lead to duplicate data. This is
> sort-of-okay as receivers really provide at-least once guarantee at best.
> Furthermore Reliable receivers like the ReliableKafkaReceiver, did not reuse
> BlockGenerator objects hence did not have the problem.
> The solution is to ensure that the internal buffer of the BlockGenerator is
> cleared every time it is started.
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