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https://issues.apache.org/jira/browse/SPARK-59403?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-59403:
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Labels: pull-request-available (was: )
> Allow empty serialized payloads for deserialized in-memory RDD blocks
> ---------------------------------------------------------------------
>
> Key: SPARK-59403
> URL: https://issues.apache.org/jira/browse/SPARK-59403
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 4.1.3
> Reporter: Xianming Lei
> Priority: Major
> Labels: pull-request-available
>
> Remote RDD block fetch currently treats a non-zero {{BlockStatus}} size
> together with a zero-byte response as an invalid block:
>
> {{if (blockSize > 0 && buf.size() == 0)}}
> This assumes that {{BlockStatus.memSize}} is the serialized payload size.
> That assumption is invalid for deserialized in-memory blocks.
> For a deserialized block, {{memSize}} is Spark's estimated JVM heap footprint
> of the cached objects. An empty iterator can still occupy heap memory (for
> example, an empty array/object has object-header overhead), while its
> serialized network representation is legitimately zero bytes. Therefore, a
> remote fetch of an empty deserialized RDD partition is incorrectly rejected.
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