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https://issues.apache.org/jira/browse/SPARK-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13967419#comment-13967419
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Mridul Muralidharan commented on SPARK-1476:
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WIP Proposal:
- All references to ByteBuffer will need to be replaced with Seq[ByteBuffer].
This applies to definition of a block, memory mapped file segments for a
shuffle block, etc.
- All use of byte array backed outputstream will need to be replaced with a
aggregating outputstream which writes to multiple boas as and when array limits
are hit.
> 2GB limit in spark for blocks
> -----------------------------
>
> Key: SPARK-1476
> URL: https://issues.apache.org/jira/browse/SPARK-1476
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Environment: all
> Reporter: Mridul Muralidharan
> Priority: Critical
>
> The underlying abstraction for blocks in spark is a ByteBuffer : which limits
> the size of the block to 2GB.
> This has implication not just for managed blocks in use, but also for shuffle
> blocks (memory mapped blocks are limited to 2gig, even though the api allows
> for long), ser-deser via byte array backed outstreams (SPARK-1391), etc.
> This is a severe limitation for use of spark when used on non trivial
> datasets.
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