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https://issues.apache.org/jira/browse/SPARK-18957?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-18957.
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Resolution: Not A Problem
> when WAL time out, loss data
> ----------------------------
>
> Key: SPARK-18957
> URL: https://issues.apache.org/jira/browse/SPARK-18957
> Project: Spark
> Issue Type: Bug
> Components: Block Manager
> Affects Versions: 1.6.2
> Environment: hadoop2.7.1 spark1.6.2
> Reporter: xy7
>
> When sparkStreaming's blockManager writeAheadLog timeout, it cause
> keepPushBlocks to be stoped, with this warn log
> "WARN scheduler.ReceiverTracker: Error reported by receiver for stream 0:
> Error in block pushing thread - java.util.concurrent.TimeoutException:
> Futures timed out after [30 seconds]".
> But the receiver continued to get data from MQ, so the data lost. In sparkUI,
> we would found all the batchs turned to 0 events.
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