Converting JSON-formatted Log Data with MaxCompute Built-in Functions and UDTF

Analysis of Business Scenarios

  1. Data Source: The application writes to the log file in real time under the specified ECS host directory.
  2. Data Formats: In log files, the format of each log is shown in the following figure (the data is simplified and masked in the example). Each log contains the device information, as well as the information for 1 or more sessions, and the number of sessions in each log is dynamic: 1 or more sessions. An example of the contents of a log is as follows:

Recommended Solution

Log Collection

get_json_object(content,'$. DeviceID') as DeviceID,
get_json_object(content,'$. UniqueIdentifier') as UniqueIdentifier,
get_json_object(content,'$. GameID') as GameID,
get_json_object(content,'$. Device') as Device,
get_json_object(content,'$. Sessions\[0]. SessionID') as Session1_ID,
get_json_object(content,'$. Sessions\[0]. Events\[0]. Name') as Session1_EventName,
get_json_object(content,'$. Sessions\[1]. SessionID') as Session2_ID,
get_json_object(content,'$. Sessions\[1]. Events\[0]. Name') as Session2_EventName
from log_target_json where pt='20180725' limit 10

Develop MaxCompute UDTF Function to Process Logs

package com.aliyun.odps;import com.aliyun.odps.udf.UDFException;
import com.aliyun.odps.udf.UDTF;
import com.aliyun.odps.udf.annotation.Resolve;
import java.util.List;
import java.util.Map;
public class get_json_udtf extends UDTF {
public void process(Object[] objects) throws UDFException, IOException {
String input = (String) objects[0];
Map map = new Gson().fromJson(input, Map.class);
Object deviceID = map.get("DeviceID");
Object uniqueIdentifier = map.get("UniqueIdentifier");
Object gameID = map.get("GameID");
Object device = map.get("Device");
List sessions = (List) map.get("Sessions");
for (Object session : sessions) {
Map sMap = (Map) session;
Object sessionID = sMap.get("SessionID");
List events = (List) sMap.get("Events");
for (Object event : events) {
String name = (String) ((Map) event).get("Name");
String timestamp = (String) ((Map) event).get("Timestamp");
String networkStatus = (String) ((Map) event).get("NetworkStatus");
forward(deviceID, uniqueIdentifier,gameID,device,
add jar maxcompute_demo-1.0-SNAPSHOT.jar -f;
create function get_json_udtf as com.aliyun.odps.get_json_udtf using maxcompute_demo-1.0-SNAPSHOT.jar';





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