KarmaGYZ commented on a change in pull request #9760: [FLINK-13982][runtime]
Implement memory calculation logics
URL: https://github.com/apache/flink/pull/9760#discussion_r332811245
##########
File path:
flink-core/src/main/java/org/apache/flink/configuration/MemorySize.java
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@@ -115,6 +116,28 @@ public String toString() {
return bytes + " bytes";
}
+ //
------------------------------------------------------------------------
+ // Calculations
+ //
------------------------------------------------------------------------
+
+ public MemorySize add(MemorySize that) {
+ return new MemorySize(Math.addExact(this.bytes, that.bytes));
+ }
+
+ public MemorySize subtract(MemorySize that) {
+ return new MemorySize(Math.subtractExact(this.bytes,
that.bytes));
+ }
+
+ public MemorySize multiply(double multiplier) {
+ checkArgument(multiplier >= 0, "multiplier must be >= 0");
+
+ BigDecimal product =
BigDecimal.valueOf(this.bytes).multiply(BigDecimal.valueOf(multiplier));
+ if (product.longValue() > Long.MAX_VALUE) {
+ throw new ArithmeticException("long overflow");
+ }
Review comment:
`BigDecimal::longValue` guarantee that its return value less than
`Long.MAX_VALUE` and if the resulting is too big to fit in a `long`, only the
low-order 64 bits are returned. So this check is useless,
`BigDecimal::compareTo` could be a valid way to compare.
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