tomicooler commented on code in PR #5895:
URL: https://github.com/apache/hadoop/pull/5895#discussion_r1276203099
##########
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/IFile.java:
##########
@@ -433,8 +434,11 @@ public boolean nextRawKey(DataInputBuffer key) throws
IOException {
}
public void nextRawValue(DataInputBuffer value) throws IOException {
+ long targetSizeLong = currentValueLength + (currentValueLength >> 1);
Review Comment:
This overflows like this. Example:
```
class HelloWorld {
public static void main(String[] args) {
int currentValueLength = Integer.MAX_VALUE - 20000;
final int ARRAY_MAX_SIZE = Integer.MAX_VALUE - 8;
for (int i = 0; i < 10; i++) {
long targetSizeLong = currentValueLength + (currentValueLength
>> 1);
int targetSize = (int) Math.min(targetSizeLong, ARRAY_MAX_SIZE);
System.out.println("targetSizeLong: " + targetSizeLong + "
targetSize: " + targetSize);
currentValueLength = targetSize;
}
}
}
```
```
targetSizeLong: -1073771826 targetSize: -1073771826
targetSizeLong: -1610657739 targetSize: -1610657739
targetSizeLong: 1878980687 targetSize: 1878980687
targetSizeLong: -1476496266 targetSize: -1476496266
targetSizeLong: 2080222897 targetSize: 2080222897
targetSizeLong: -1174632951 targetSize: -1174632951
targetSizeLong: -1761949427 targetSize: -1761949427
targetSizeLong: 1652043155 targetSize: 1652043155
targetSizeLong: -1816902564 targetSize: -1816902564
targetSizeLong: 1569613450 targetSize: 1569613450
```
Fix:
```
long targetSizeLong = currentValueLength + (long)(currentValueLength >> 1);
```
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