Manual:$wgAttemptFailureEpoch

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Files and file uploads: $wgAttemptFailureEpoch
Bump this to quickly retry thumbnail creation failures.
Introduced in version:1.23.0 (Gerrit change 107419; git #dc496c02)
Removed in version:still in use
Allowed values:Unspecified
Default value:1

DetailsEdit

Certain operations are avoided if there were too many recent failures, for example, thumbnail generation. Bump this value to invalidate all memory of failed operations and thus allow further attempts to resume. This is useful when a cause for the failures has been found and fixed.

In practice this value is concatenated with the failure lookup key, and changing it will cause old failures to no longer be found.

Only thumbnail generation is currently using this setting.