xuzhiwen1255 commented on code in PR #21971:
URL: https://github.com/apache/flink/pull/21971#discussion_r1113724624
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flink-streaming-java/src/main/java/org/apache/flink/streaming/api/functions/source/datagen/SequenceGenerator.java:
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@@ -83,10 +85,22 @@ public void open(
final int taskIdx = runtimeContext.getIndexOfThisSubtask();
final long congruence = start + taskIdx;
- long totalNoOfElements = Math.abs(end - start + 1);
- final int baseSize = safeDivide(totalNoOfElements, stepSize);
- final int toCollect =
- (totalNoOfElements % stepSize > taskIdx) ? baseSize + 1 :
baseSize;
+
+ Preconditions.checkArgument(
+ start < end, "The start value cannot be greater than the
end value.");
+
+ // After preventing setting to Long.MAX_VALUE, the length of
+ // Long type will be exceeded after +1
+ final BigInteger totalNoOfElements =
+ BigInteger.valueOf(end)
+ .subtract(BigInteger.valueOf(start))
+ .add(BigInteger.valueOf(1));
+
+ final BigInteger baseSize =
totalNoOfElements.divide(BigInteger.valueOf(stepSize));
+ final long toCollect =
+
totalNoOfElements.remainder(BigInteger.valueOf(stepSize)).longValue() > taskIdx
+ ? baseSize.add(BigInteger.valueOf(1)).longValue()
Review Comment:
Do you mean to limit the maximum value of the start of the sequence to
Integer.MAX_VALUE-1?
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