jin xing created SPARK-21342:
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Summary: 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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