[c++] remove HDFS support (fixes #6436) #6534
Merged
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Follow-up to #6443.
Fixes #6436
Proposes fully removing HDFS support.
See #6443 for the reasons that I think it's safe to drop this support in LightGBM, and for suggestions of other ways that people with data in HDFS could train LightGBM models on that data.
cc @imatiach-msft @mhamilton723