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https://issues.apache.org/jira/browse/SPARK-21596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16111586#comment-16111586
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Hyukjin Kwon commented on SPARK-21596:
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User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/18799
> Audit the places calling HDFSMetadataLog.get
> --------------------------------------------
>
> Key: SPARK-21596
> URL: https://issues.apache.org/jira/browse/SPARK-21596
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.1.1
> Reporter: Shixiong Zhu
>
> When I was investigating a flaky test, I realized that many places don't
> check the return value of `HDFSMetadataLog.get(batchId: Long): Option[T]`.
> When a batch is supposed to be there, the caller just ignores None rather
> than throwing an error. If some bug causes a query doesn't generate a batch
> metadata file, this behavior will hide it and allow the query continuing to
> run.
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