Message-based problem diagnosis and root cause analysis

1. A computer-implemented method comprising:

constructing, by a processor, a knowledge graph by writing a plurality of data structures to connect correlated log messages in a system log;

detecting, by the processor, an anomalous log message based on the knowledge graph, wherein the anomalous log message is connected to a plurality of candidate root cause error log messages;

writing, by the processor, a bit to the system log to identify the anomalous log message;

determining, by the processor, respective sequences from each of the plurality of candidate root cause error log messages to the anomalous log message;

calculating, by the processor, a deviation score for each respective sequence based on a deviation of an expected sequence for each candidate root cause error log message and the determined sequence; and

determining, by the processor, a root cause log error message based on the calculated deviation scores.

2. The computer-implemented method of claim 1 , wherein the log messages are correlated based on a semantic analysis of the log messages.

3. The computer-implemented method of claim 1 , wherein the root cause error log message is further determined based on a position in the knowledge graph.

4. The computer-implemented method of claim 1 , wherein the expected sequence for a candidate root cause error message of the plurality of candidate root cause error log messages is based at least in part on an application writing the candidate root cause error message of the plurality of candidate root cause error log messages.

5. The computer-implemented method of claim 1 , wherein a data structure of the plurality of data structures comprises a memory address of a correlated log message.

6. The computer-implemented method of claim 1 further comprises:

ranking each candidate root cause error log message based on the deviation scores; and

displaying a ranked list of candidate root cause error log messages.

7. A system comprising:

a memory having computer readable instructions; and

one or more processors for executing the computer readable instructions, the computer readable instructions controlling the one or more processors to perform operations comprising:

constructing a knowledge graph by writing a plurality of data structures to connect correlated log messages in a system log;

detecting an anomalous log message based on the knowledge graph, wherein the anomalous log message is connected to a plurality of candidate root cause error log messages;

writing a bit to the system log to identify the anomalous log message;

determining respective sequences from each of the plurality of candidate root cause error log messages to the anomalous log message;

calculating a deviation score for each respective sequence based on a deviation of an expected sequence for each candidate root cause error log message and the determined sequence; and

determining a root cause log error message based on the calculated deviation scores.

8. The system of claim 7 , wherein the log messages are correlated based on a semantic analysis of the log messages.

9. The system of claim 7 , wherein the root cause error log message is further determined based on a position in the knowledge graph.

10. The system of claim 7 , wherein the expected sequence for a candidate root cause error message of the plurality of candidate root cause error log messages is based at least in part on an application writing a candidate root cause error message of the plurality of candidate root cause error log messages.

11. The system of claim 7 , wherein a data structure of the plurality of data structures comprises a memory address of a correlated log message.

12. The system of claim 7 , the operations further comprise:

ranking each candidate root cause error log message based on the deviation scores; and

displaying a ranked list of candidate root cause error log messages.

13. A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to perform operations comprising:

constructing a knowledge graph by writing a plurality of data structures to connect correlated log messages in a system log;

detecting an anomalous log message based on the knowledge graph, wherein the anomalous log message is connected to a plurality of candidate root cause error log messages;

writing a bit to the system log to identify the anomalous log message;

determining respective sequences from each of the plurality of candidate root cause error log messages to the anomalous log message;

calculating a deviation score for each respective sequence based on a deviation of an expected sequence for each candidate root cause error log message and the determined sequence; and

determining a root cause log error message based on the calculated deviation scores.

14. The computer program product of claim 13 , wherein the log messages are correlated based on a semantic analysis of the log messages.

15. The computer program product of claim 13 , wherein the root cause error log message is further determined based on a position in the knowledge graph.

16. The computer program product of claim 13 , wherein the expected sequence for a candidate root cause error message of the plurality of candidate root cause error log messages is based at least in part on an application writing the candidate root cause error message of the plurality of candidate root cause error log messages.

17. The computer program product of claim 13 , wherein a data structure of the plurality of data structures comprises a memory address of a correlated log message.