[jira] [Created] (HBASE-27030) Fix undefined local variable error in draining_servers.rb

["Junegunn Choi (Jira)" <ji...@apache.org>]

Junegunn Choi created HBASE-27030:
-------------------------------------

             Summary: Fix undefined local variable error in draining_servers.rb
                 Key: HBASE-27030
                 URL: https://issues.apache.org/jira/browse/HBASE-27030
             Project: HBase
          Issue Type: Bug
    Affects Versions: 3.0.0-alpha-3
            Reporter: Junegunn Choi


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.

{quote}
  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
{quote}
 
{code:java}
for i in [1, 2, 3]
  a = i
end
puts a
  # 3

[4, 5, 6].each do |i|
  b = i
end
puts b
  # undefined local variable or method `b'
{code}

We can define the admin local variable in the current scope beforehand, and we can still access it after the block.

 



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