Support dynamic refresh impersonation user #17296
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What changes are proposed in this pull request?
fix #17295
Automatically refresh the impersonation user configuration when the configuration file
alluxio-site.properties
is modified.Why are the changes needed?
support dynamic refresh impersonation user.
Does this PR introduce any user facing changes?
When alluxio.security.dynamic.impersonation.enabled is set to true, the impersonation user can be dynamically updated if the configuration file changes.