junegunn opened a new pull request, #4427:
URL: https://github.com/apache/hbase/pull/4427
HBASE-21812 replaced a for-loop with an each block. Each block introduces a
new scope, so a local variable defined inside it cannot be accessed afterwards.
```
NameError: undefined local variable or method `admin' for main:Object
getServerNames at /opt/khp/hbase/bin/draining_servers.rb:81
addServers at /opt/khp/hbase/bin/draining_servers.rb:88
<main> at /opt/khp/hbase/bin/draining_servers.rb:146
```
This commit defines the admin local variable in the current scope
beforehand, so that we can still access it after the block.
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