smengcl edited a comment on pull request #2680:
URL: https://github.com/apache/hadoop/pull/2680#issuecomment-796956673
Good catch. Actually because `TraceAdmin` is removed, the `trace` subcommand
is referencing a non-existent class now:
```
$ ./bin/hadoop trace
Error: Could not find or load main class org.apache.hadoop.tracing.TraceAdmin
```
I'm +1 on removing this right now.
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