xinglin commented on pull request #4094:
URL: https://github.com/apache/hadoop/pull/4094#issuecomment-1075602418
> Could you add a pointer to where/how the corresponding logic lives in the
non-abstract filesystem object, just to easily verify the logic is the same
The logic is in DelegationTokenIssuer.java for
FileSystem.java/ViewFileSystem.java. `collectDelegationTokens()` in
DelegationTokenIssuer will collect token for the current issuer and all
AdditionalTokenIssuers. In FileSystem.java, we overwrite
`getAdditionalTokenIssuers()` to call `getChildFileSystem()` and ViewFileSystem
overwrites `getChildFileSystem()`, to include the fallback FS as well. So,
ViewFileSystem.java is good here.
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