Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/17335
Broaden this issue a bit. Currently in driver side (client mode), issued
delegation tokens are not added into current ugi, this makes follow-up
hdfs/metastore/hbase communication still use tgt instead of delegation tokens,
this is unnecessary and should be avoided, since we already get tokens in
yarn#client.
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