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https://issues.apache.org/jira/browse/SPARK-3129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14122017#comment-14122017
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Hari Shreedharan commented on SPARK-3129:
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[~tgraves] - Am I correct in assuming that using Akka automatically gives the 
shared secret authentication if spark.authenticate is set to true - if the AM 
is restarted by YARN itself (since it is the same application, it theoretically 
has access to the same shared secret and thus should be able to communicate via 
Akka)? 

> Prevent data loss in Spark Streaming
> ------------------------------------
>
>                 Key: SPARK-3129
>                 URL: https://issues.apache.org/jira/browse/SPARK-3129
>             Project: Spark
>          Issue Type: New Feature
>            Reporter: Hari Shreedharan
>            Assignee: Hari Shreedharan
>         Attachments: StreamingPreventDataLoss.pdf
>
>
> Spark Streaming can small amounts of data when the driver goes down - and the 
> sending system cannot re-send the data (or the data has already expired on 
> the sender side). The document attached has more details. 



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