Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/19460#discussion_r143570916
--- Diff:
common/unsafe/src/main/java/org/apache/spark/unsafe/array/ByteArrayMethods.java
---
@@ -40,6 +40,15 @@ public static int roundNumberOfBytesToNearestWord(int
numBytes) {
}
}
+ // Some JVMs can't allocate arrays of length Integer.MAX_VALUE; actual
max is somewhat smaller.
+ // Be conservative and lower the cap a little.
+ public static int MAX_ARRAY_LENGTH = Integer.MAX_VALUE - 8;
+
+ // Use this value if the allocated byte arrays are used to store other
types rather than bytes.
+ public static int maxWordRoundedArrayLength() {
+ return roundNumberOfBytesToNearestWord(MAX_ARRAY_LENGTH - 8);
--- End diff --
Rounding won't do; it has to round _down_. I see that's why you wrote -8
here but it's a little confusing as -7 works more directly. And then, why
bother? just write -15 in the constant above and explain.
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