xintongsong commented on a change in pull request #9760: [FLINK-13982][runtime]
Implement memory calculation logics
URL: https://github.com/apache/flink/pull/9760#discussion_r328014034
##########
File path:
flink-core/src/main/java/org/apache/flink/configuration/MemorySize.java
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@@ -115,6 +115,27 @@ 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");
+ double product = this.bytes * multiplier;
Review comment:
MemorySize is essentially a size in bytes stored in long type. Converting
from double type to long type should not be a problem. We might loose at most 1
byte in each multiply operation due to the rounding down error, which should be
acceptable..
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