Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/11805#discussion_r58147716
--- Diff: core/src/main/scala/org/apache/spark/storage/StorageLevel.scala
---
@@ -60,10 +60,7 @@ class StorageLevel private(
assert(replication < 40, "Replication restricted to be less than 40 for
calculating hash codes")
if (useOffHeap) {
- require(!useDisk, "Off-heap storage level does not support using disk")
- require(!useMemory, "Off-heap storage level does not support using
heap memory")
require(!deserialized, "Off-heap storage level does not support
deserialized storage")
--- End diff --
Unfortunately, it's not going to be super easy to do this right now because
of how StorageLevel serves the dual purpose of being both a specification of
how blocks should be stored and a description of how they're actually stored
(i.e. an "effective storage level"). If we added this constraint, the logic for
constructing effective storage levels would become much more complicated.
Therefore, I think we should address this issue later and leave the code
as-is for now.
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