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https://issues.apache.org/jira/browse/SPARK-21342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16078254#comment-16078254
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Apache Spark commented on SPARK-21342:
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User 'jinxing64' has created a pull request for this issue:
https://github.com/apache/spark/pull/18565
> Fix DownloadCallback to work well with RetryingBlockFetcher
> -----------------------------------------------------------
>
> Key: SPARK-21342
> URL: https://issues.apache.org/jira/browse/SPARK-21342
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.1
> Reporter: jin xing
>
> When {{RetryingBlockFetcher}} retries fetching blocks. There could be two
> {{DownloadCallbacks}} download the same content to the same target file. It
> could cause {{ShuffleBlockFetcherIterator}} reading a partial result.
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