Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/15915#discussion_r92323575 --- Diff: core/src/test/scala/org/apache/spark/storage/MemoryStoreSuite.scala --- @@ -303,6 +303,34 @@ class MemoryStoreSuite assert(memoryStore.currentUnrollMemoryForThisTask === 0) // discard released the unroll memory } + test("set unrollMemoryThreshold a huge value larger than Int.MaxValue") { + val tmpConf = conf.clone.set("spark.storage.unrollMemoryThreshold", s"${1L + Int.MaxValue}") + val (memoryStore, blockInfoManager) = makeMemoryStore(12000L + Int.MaxValue, tmpConf) + val smallList = List.fill(40)(new Array[Byte](100)) + def smallIterator: Iterator[Any] = smallList.iterator.asInstanceOf[Iterator[Any]] + assert(memoryStore.currentUnrollMemoryForThisTask === 0) + + def putIteratorAsBytes[T]( + blockId: BlockId, + iter: Iterator[T], + classTag: ClassTag[T]): Either[PartiallySerializedBlock[T], Long] = { + assert(blockInfoManager.lockNewBlockForWriting( + blockId, + new BlockInfo(StorageLevel.MEMORY_ONLY_SER, classTag, tellMaster = false))) + val res = memoryStore.putIteratorAsBytes(blockId, iter, classTag, MemoryMode.ON_HEAP) + blockInfoManager.unlock(blockId) + res + } + + // Unroll with plenty of space. This should succeed and cache both blocks. + val result1 = putIteratorAsBytes("b1", smallIterator, ClassTag.Any) + val result2 = putIteratorAsBytes("b2", smallIterator, ClassTag.Any) + assert(memoryStore.contains("b1")) + assert(memoryStore.contains("b2")) + assert(result1.isRight) // unroll was successful + assert(result2.isRight) --- End diff -- nvm. It will be released once unrolling is successful.
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