Cluster: Assign default human-readable node name when starting server

[zhijun42]

By default, servers in a cluster don't have a human-readable nodename unless explicitly set by user. This can be annoying when reading the server logs during local development, since we would need to manually lookup the unique node ID (40 chars long) to figure out its port number. Most logging statements in the cluster are in the form of serverLog(LL_NOTICE, "Something.. %.40s (%s) something..", node->name, node->human_nodename); , and thus this would always result in an empty () like the following:

2832:M 26 Oct 2025 18:00:14.033 * Node dd4f43d9e4a1a2875a514733c08d4870c21db682 () is now a replica of node 1b5d2a4865c04aaa1ccf06db66f22a043411ded7 () in shard d3fc557d12ab3c5a8850c7b0c9afb252b473cad1
2832:M 26 Oct 2025 18:00:14.033 * Clear FAIL state for node dd4f43d9e4a1a2875a514733c08d4870c21db682 (): replica is reachable again.
2832:M 26 Oct 2025 19:21:07.191 * NODE 524978a9924b5841c4c93f83581d202cfbce1443 () possibly failing.
2832:M 26 Oct 2025 19:21:07.838 * FAIL message received from 747e0f97a58cd5a7ac4c2130417fc47a807802ed () about 524978a9924b5841c4c93f83581d202cfbce1443 ()
2832:M 26 Oct 2025 19:22:40.434 * Clear FAIL state for node 524978a9924b5841c4c93f83581d202cfbce1443 (): replica is reachable again.
2832:M 26 Oct 2025 19:46:43.539 * FAIL message received from 747e0f97a58cd5a7ac4c2130417fc47a807802ed () about 1b5d2a4865c04aaa1ccf06db66f22a043411ded7 ()
2832:M 26 Oct 2025 19:46:43.539 # Cluster state changed: fail

Assigning a default human-readable nodename solves the annoyance:

7614:S 26 Oct 2025 19:52:21.642 * NODE 03b3811da7b33451f6e4988295b0158f410d2c00 (127.0.0.1:7001) possibly failing.
7614:S 26 Oct 2025 19:52:22.550 * Marking node 03b3811da7b33451f6e4988295b0158f410d2c00 (127.0.0.1:7001) as failing (quorum reached).
7614:S 26 Oct 2025 19:54:15.915 * NODE b2f0fc93632d12c06039335b025365d484ff9049 (127.0.0.1:7002) possibly failing.
7614:S 26 Oct 2025 19:54:16.117 * Marking node b2f0fc93632d12c06039335b025365d484ff9049 (127.0.0.1:7002) as failing (quorum reached).
7614:S 26 Oct 2025 19:54:16.117 # Cluster state changed: fail
7614:S 26 Oct 2025 19:54:16.117 # Cluster is currently down: At least one hash slot is not served by any available node. Please check the 'cluster-require-full-coverage' configuration.
7614:S 26 Oct 2025 19:54:16.574 * Reconfiguring node 524978a9924b5841c4c93f83581d202cfbce1443 (127.0.0.1:7005) as primary for shard 8488c1c467066206db60b136e9a38e1f583eb1f8

For now I use the node's IP and port combination as the nodename. If users have personal preference on the format, they can always update nodename via CONFIG SET cluster-announce-human-nodename MYNAME command or edit the config file.

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.42%. Comparing base (baf2d57) to head (987ebcf).
⚠️ Report is 1 commits behind head on unstable.

Files with missing lines	Patch %	Lines
src/cluster_legacy.c	83.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #2777      +/-   ##
============================================
- Coverage     72.47%   72.42%   -0.05%     
============================================
  Files           128      128              
  Lines         71624    70155    -1469     
============================================
- Hits          51908    50813    -1095     
+ Misses        19716    19342     -374     

Files with missing lines	Coverage Δ
src/cluster_legacy.c	87.29% <83.33%> (+0.19%)	⬆️

... and 104 files with indirect coverage changes

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