Class: RBHive::Connection
- Inherits:
-
Object
- Object
- RBHive::Connection
show all
- Defined in:
- lib/rbhive/connection.rb
Instance Attribute Summary collapse
Instance Method Summary
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Constructor Details
#initialize(server, port = 10_000, logger = StdOutLogger.new) ⇒ Connection
Returns a new instance of Connection.
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# File 'lib/rbhive/connection.rb', line 33
def initialize(server, port=10_000, logger=StdOutLogger.new)
@socket = Thrift::Socket.new(server, port)
@transport = Thrift::BufferedTransport.new(@socket)
@protocol = Thrift::BinaryProtocol.new(@transport)
@client = ThriftHive::Client.new(@protocol)
@logger = logger
@logger.info("Connecting to #{server} on port #{port}")
end
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Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(meth, *args) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 106
def method_missing(meth, *args)
client.send(meth, *args)
end
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Instance Attribute Details
#client ⇒ Object
Returns the value of attribute client.
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# File 'lib/rbhive/connection.rb', line 31
def client
@client
end
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Instance Method Details
#add_columns(schema) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 102
def add_columns(schema)
execute(schema.add_columns_statement)
end
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#close ⇒ Object
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# File 'lib/rbhive/connection.rb', line 46
def close
@transport.close
end
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#create_table(schema) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 89
def create_table(schema)
execute(schema.create_table_statement)
end
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#drop_table(name) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 93
def drop_table(name)
name = name.name if name.is_a?(TableSchema)
execute("DROP TABLE `#{name}`")
end
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#execute(query) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 54
def execute(query)
@logger.info("Executing Hive Query: #{query}")
client.execute(query)
end
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#fetch(query) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 72
def fetch(query)
execute(query)
ResultSet.new(client.fetchAll, client.getSchema)
end
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#fetch_in_batch(query, batch_size = 100) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 77
def fetch_in_batch(query, batch_size=100)
execute(query)
until (next_batch = client.fetchN(batch_size)).empty?
yield ResultSet.new(next_batch)
end
end
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#first(query) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 84
def first(query)
execute(query)
ResultSet.new([client.fetchOne])
end
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#open ⇒ Object
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# File 'lib/rbhive/connection.rb', line 42
def open
@transport.open
end
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#priority=(priority) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 59
def priority=(priority)
set("mapred.job.priority", priority)
end
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#queue=(queue) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 63
def queue=(queue)
set("mapred.job.queue.name", queue)
end
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#replace_columns(schema) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 98
def replace_columns(schema)
execute(schema.replace_columns_statement)
end
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#set(name, value) ⇒ Object
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# File 'lib/rbhive/connection.rb', line 67
def set(name,value)
@logger.info("Setting #{name}=#{value}")
client.execute("SET #{name}=#{value}")
end
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