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Posted to issues@spark.apache.org by "Tathagata Das (JIRA)" <ji...@apache.org> on 2015/08/05 00:46:05 UTC

[jira] [Updated] (SPARK-9619) Restarting the receiver's BlockGenerator does not clear previously buffered data

     [ https://issues.apache.org/jira/browse/SPARK-9619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tathagata Das updated SPARK-9619:
---------------------------------
    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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