Business Context
IT Operations is mapping server dependencies. Some legacy servers ping themselves (localhost loopback) for heartbeat checks. The team needs to identify critical dependency clusters (cores) while explicitly handling these self-loops, which are usually ignored but are critical for this specific legacy audit.
Data Preparation
Defining a server network including self-loops (Server_A -> Server_A) and isolated islands.
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| 2 | DATA mycas.server_logs; |
| 3 | INFILE DATALINES delimiter=','; |
| 4 | INPUT src_srv $ dest_srv $; |
| 5 | DATALINES; |
| 6 | SRV_A,SRV_A, SRV_A,SRV_B, SRV_B,SRV_C, SRV_C,SRV_A, SRV_D,SRV_E, SRV_Z,SRV_Z; |
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| 8 | RUN; |
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Étapes de réalisation
1
Execute Core Decomposition enabling 'selfLinks' to include loopbacks in the density calculation.
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| 2 | PROC CAS; |
| 3 | network.core / selfLinks=TRUE links={name='server_logs', from='src_srv', to='dest_srv'} outNodes={name='server_resilience', replace=true}; |
| 4 | |
| 5 | RUN; |
| 6 | |
| 7 | QUIT; |
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2
Review Solution Summary to confirm self-links were processed.
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| 2 | PROC CAS; |
| 3 | TABLE.fetch / TABLE='server_resilience'; |
| 4 | |
| 5 | RUN; |
| 6 | |
| 7 | QUIT; |
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Expected Result
Server_A and Server_Z (which have self-links) should be processed correctly. Server_Z, despite being isolated from the main grid, has a link to itself, which might affect its core classification compared to a completely disconnected node if selfLinks=FALSE was used. The 3-node loop (A-B-C) should form a higher core.