Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/22705#discussion_r224965160 --- Diff: core/src/main/scala/org/apache/spark/util/io/ChunkedByteBuffer.scala --- @@ -195,7 +196,11 @@ object ChunkedByteBuffer { val is = new FileInputStream(file) ByteStreams.skipFully(is, offset) val in = new LimitedInputStream(is, length) - val chunkSize = math.min(maxChunkSize, length).toInt + // Though in theory you should be able to index into an array of size Int.MaxValue, in practice + // jvms don't let you go up to limit. It seems you may only need - 2, but we leave a little + // extra room. + val maxArraySize = Int.MaxValue - 512 --- End diff -- Looks like the max is safely more like `Int.MaxValue - 5` from things like https://www.quora.com/What-is-the-maximum-size-of-the-array-in-Java You could probably push it further, but whatever.
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