Significant CPU Usage When Parsing Large JSON Files with Jackson in Spring Boot
I've hit a wall trying to I'm relatively new to this, so bear with me. I'm wondering if anyone has experience with I'm not sure how to approach I'm facing an issue with high CPU usage when parsing large JSON files (around 100MB each) using the Jackson library in my Spring Boot application... The parsing process appears to spike CPU usage to 100% on a single core, which is causing performance bottlenecks in my service. I've tried using the `ObjectMapper` with streams to handle the JSON deserialization, but the performance hasn't improved significantly. Here's a simplified version of my code: ```java import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.JsonNode; import java.io.File; import java.io.IOException; public class JsonParser { private final ObjectMapper objectMapper = new ObjectMapper(); public void parseJson(File file) throws IOException { JsonNode jsonNode = objectMapper.readTree(file); // Process JSON data } } ``` When profiling the application, I noticed that the `readTree` method consumes most of the CPU time. I've also tried using `JsonParser` for streaming the processing, but the performance is still not optimal: ```java import com.fasterxml.jackson.core.JsonFactory; import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; public class StreamingJsonParser { private final ObjectMapper objectMapper = new ObjectMapper(); private final JsonFactory jsonFactory = new JsonFactory(); public void parseJsonStream(File file) throws IOException { try (JsonParser parser = jsonFactory.createParser(file)) { JsonNode jsonNode = objectMapper.readTree(parser); // Process JSON data } } } ``` I've also increased the heap size in my application configuration, but it doesn't seem to have any impact. The application is running on Java 17 with Spring Boot 2.5.4. What can I do to reduce the CPU load and improve the performance of JSON parsing? Are there any specific configurations, libraries, or techniques that could optimize the process? This is part of a larger REST API I'm building. Thanks in advance! I'm using Java 3.9 in this project. What's the best practice here? This is my first time working with Java 3.11. What's the best practice here? Cheers for any assistance!