User report that they can no longer able to process transactions with the online ordering application, and the logging dashboard is displaying these messages.
Fri Jan 10 19:37:31.123 EST 2020 [FRONTEND] INFO: Incoming request to add item to cart from user 45834534858 Fri Jan 10 19:37:31.247 EST 2020 [BACKEND] INFO: Attempting to add item to cart Fri Jan 10 19:37:31.250 EST 2020 [BACKEND] ERROR: Failed to add item: MYSQLDB ERROR: Connection refused What is causing the problem seen in these log messages?
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A. B. C. D.A.
Based on the log messages provided, the issue appears to be related to the database connection. The log messages indicate that a user attempted to add an item to their cart, and the backend process attempted to add the item to the database, but encountered an error with the message "MYSQLDB ERROR: Connection refused". This error suggests that the backend process was unable to establish a connection to the MySQL database.
Option A, which suggests that the database server container has crashed, is a possible cause of the issue, but cannot be determined from the given log messages alone. If the database server container has crashed, then the backend process would not be able to establish a connection to the database, and would likely generate similar error messages.
Option B, which suggests that the backend process is overwhelmed with too many transactions, is also a possible cause of the issue, but again, cannot be determined from the given log messages alone. If the backend process is overloaded with too many transactions, it may cause delays or failures in the process of adding items to the database.
Option C, which suggests that the backend is not authorized to commit to the database, is unlikely to be the cause of the issue. If the backend process is not authorized to commit to the database, it would likely generate an error message indicating an authorization issue, rather than a connection issue.
Option D, which suggests that the user is not authorized to add the item to their cart, is also unlikely to be the cause of the issue. If the user is not authorized to add items to their cart, it would likely generate an error message indicating a permission issue, rather than a connection issue.
In summary, based on the log messages provided, it is most likely that the issue is caused by a problem with the database connection, which may be due to a variety of factors, including a crashed database server container, an overloaded backend process, or network connectivity issues. Further investigation would be required to determine the root cause of the issue.