[SPARK-21342] Fix DownloadCallback to work well with RetryingBlockFetcher

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.0
• Fix Version/s: 2.2.1, 2.3.0
• Component/s: Spark Core
• Assignee: Jin Xing
• Reporter: Jin Xing
• Created: 07/Jul/17 15:33
• Updated: 10/Jul/17 13:13
• Resolved: 10/Jul/17 13:12

Description

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.

Issue Links

• links to: [Github] Pull Request #18565 (jinxing64)