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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2022/08/05 01:28:00 UTC
[jira] [Assigned] (SPARK-39983) Should not cache unserialized broadcast relations on the driver
[ https://issues.apache.org/jira/browse/SPARK-39983?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-39983:
------------------------------------
Assignee: Apache Spark
> Should not cache unserialized broadcast relations on the driver
> ---------------------------------------------------------------
>
> Key: SPARK-39983
> URL: https://issues.apache.org/jira/browse/SPARK-39983
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.3.0
> Reporter: Alex Balikov
> Assignee: Apache Spark
> Priority: Minor
>
> In TorrentBroadcast.writeBlocks we store the unserialized broadcast object in addition to the serialized version of it -
> {code:java}
> private def writeBlocks(value: T): Int = {
> import StorageLevel._
> // Store a copy of the broadcast variable in the driver so that tasks run on the driver
> // do not create a duplicate copy of the broadcast variable's value.
> val blockManager = SparkEnv.get.blockManager
> if (!blockManager.putSingle(broadcastId, value, MEMORY_AND_DISK, tellMaster = false)) {
> throw new SparkException(s"Failed to store $broadcastId in BlockManager")
> }
> {code}
> In case of broadcast relations, these objects can be fairly large (60MB in one observed case) and are not strictly necessary on the driver.
> Add the option to not keep the unserialized versions of the objects.
>
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