85e654c5ec
This patch refactors the MemoryManager class structure. After #9000, Spark had the following classes: - MemoryManager - StaticMemoryManager - ExecutorMemoryManager - TaskMemoryManager - ShuffleMemoryManager This is fairly confusing. To simplify things, this patch consolidates several of these classes: - ShuffleMemoryManager and ExecutorMemoryManager were merged into MemoryManager. - TaskMemoryManager is moved into Spark Core. **Key changes and tasks**: - [x] Merge ExecutorMemoryManager into MemoryManager. - [x] Move pooling logic into Allocator. - [x] Move TaskMemoryManager from `spark-unsafe` to `spark-core`. - [x] Refactor the existing Tungsten TaskMemoryManager interactions so Tungsten code use only this and not both this and ShuffleMemoryManager. - [x] Refactor non-Tungsten code to use the TaskMemoryManager instead of ShuffleMemoryManager. - [x] Merge ShuffleMemoryManager into MemoryManager. - [x] Move code - [x] ~~Simplify 1/n calculation.~~ **Will defer to followup, since this needs more work.** - [x] Port ShuffleMemoryManagerSuite tests. - [x] Move classes from `unsafe` package to `memory` package. - [ ] Figure out how to handle the hacky use of the memory managers in HashedRelation's broadcast variable construction. - [x] Test porting and cleanup: several tests relied on mock functionality (such as `TestShuffleMemoryManager.markAsOutOfMemory`) which has been changed or broken during the memory manager consolidation - [x] AbstractBytesToBytesMapSuite - [x] UnsafeExternalSorterSuite - [x] UnsafeFixedWidthAggregationMapSuite - [x] UnsafeKVExternalSorterSuite **Compatiblity notes**: - This patch introduces breaking changes in `ExternalAppendOnlyMap`, which is marked as `DevloperAPI` (likely for legacy reasons): this class now cannot be used outside of a task. Author: Josh Rosen <joshrosen@databricks.com> Closes #9127 from JoshRosen/SPARK-10984. |
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