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https://issues.apache.org/jira/browse/SPARK-3119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14101931#comment-14101931
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Apache Spark commented on SPARK-3119:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/2030
> Re-implement TorrentBroadcast
> -----------------------------
>
> Key: SPARK-3119
> URL: https://issues.apache.org/jira/browse/SPARK-3119
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> TorrentBroadcast is unnecessarily complicated:
> 1. It tracks a lot of mutable states, such as total number of bytes, number
> of blocks fetched.
> 2. It has at least two data structures that are not needed: TorrentInfo and
> TorrentBlock.
> 3. It uses getSingle on executors to get the block instead of getLocal,
> resulting in an extra roundtrip to look up the location of the block when the
> block doesn't exist yet.
> 4. It has a metadata block that is completely unnecessary.
> 5. It does an extra memory copy during deserialization to copy all the blocks
> into a single giant array.
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