The matching stage makes up to three musicbrainzngs calls per job, none of
which retried. A dropped TLS connection (surfacing as NetworkError,
"<urlopen error [SSL: UNEXPECTED_EOF_WHILE_READING]>") or a 503 rate-limit
(ResponseError) failed the entire pipeline for the job, which then re-queued
and re-ran from scratch — ~36% of jobs churned this way over a 6h window.
Wrap the three MB calls in _with_retry (4 attempts, 1s/2s/4s exponential
backoff), catching only the two transient musicbrainzngs error types so real
bugs still propagate. musicbrainzngs stays lazily imported to keep module
import offline.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jonathan
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