manoj-mathivanan commented on code in PR #18391:
URL: https://github.com/apache/kafka/pull/18391#discussion_r2078312773
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tools/src/main/java/org/apache/kafka/tools/ProducerPerformance.java:
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@@ -194,9 +195,16 @@ static List<byte[]> readPayloadFile(String
payloadFilePath, String payloadDelimi
throw new IllegalArgumentException("File does not exist or
empty file provided.");
}
- String[] payloadList =
Files.readString(path).split(payloadDelimiter);
+ List<String> payloadList = new ArrayList<>();
+ try (Scanner payLoadScanner = new Scanner(path,
StandardCharsets.UTF_8)) {
+ //setting the delimiter while parsing the file, avoids loading
entire data in memory before split
+ payLoadScanner.useDelimiter(payloadDelimiter);
Review Comment:
The main issue is because we try to load the entire file into a single
String object which is limited. Even though the machine has memory, the String
object is limited to the size of an array as seen here:
https://github.com/openjdk/jdk/blob/f1d85ab3e61f923b4e120cf30e16109e04505b53/src/java.base/share/classes/java/lang/String.java#L568
When we use a delimiter with a Scanner, the entire file is not loaded into a
String object before splitting it.
The payLoadScanner.next() starts parsing from the position where it is
currently at and keeps searching for the delimiter as seen here:
https://github.com/openjdk/jdk/blob/f1d85ab3e61f923b4e120cf30e16109e04505b53/src/java.base/share/classes/java/util/Scanner.java#L1011
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