MLS-C01 Exploratory Data Analysis Practice Question

Exhibit

Refer to the exhibit.

{
  "Logs": [
    {
      "timestamp": "2023-10-01T10:00:00Z",
      "level": "ERROR",
      "message": "NullPointerException: Cannot invoke method on null object"
    },
    {
      "timestamp": "2023-10-01T10:01:00Z",
      "level": "ERROR",
      "message": "NullPointerException: Cannot invoke method on null object"
    },
    {
      "timestamp": "2023-10-01T10:02:00Z",
      "level": "WARN",
      "message": "Connection timeout"
    },
    {
      "timestamp": "2023-10-01T10:03:00Z",
      "level": "ERROR",
      "message": "NullPointerException: Cannot invoke method on null object"
    }
  ]
}

A data scientist is analyzing application logs in JSON format. Based on the exhibit, which EDA insight is most valuable for troubleshooting?

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

There is a recurring NullPointerException error.

The repeated NullPointerException error appears multiple times in the logs, indicating a recurring issue that is most valuable for troubleshooting. Option B is incorrect because the logs show different timestamps, not all the same. Option C is incorrect because connection timeout appears only once, while the NullPointerException is more frequent. Option D is incorrect because the log levels vary, and the majority of logs are not at WARN level.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
There is a recurring NullPointerException error.
Why this is correct
Three out of four logs are the same error, indicating a pattern.
✗
All logs occurred at the same timestamp.
Why it's wrong here
Timestamps are different.
✗
There is a connection timeout issue.
Why it's wrong here
Only one WARN log about timeout; less frequent.
✗
Most logs are at WARN level.
Why it's wrong here
Only one WARN; three are ERROR.

Go deeper

MLS-C01 Exploratory Data Analysis Practice Question

Exhibit

Why each option matters

Option-by-option breakdown

Related to this question