# -*- coding: utf-8 -*-
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"""
This module contains a sqoop 1 operator
"""
import os
import signal
from airflow.contrib.hooks.sqoop_hook import SqoopHook
from airflow.exceptions import AirflowException
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
[docs]class SqoopOperator(BaseOperator):
"""
Execute a Sqoop job.
Documentation for Apache Sqoop can be found here:
https://sqoop.apache.org/docs/1.4.2/SqoopUserGuide.html
"""
[docs] template_fields = ('conn_id', 'cmd_type', 'table', 'query', 'target_dir',
'file_type', 'columns', 'split_by',
'where', 'export_dir', 'input_null_string',
'input_null_non_string', 'staging_table',
'enclosed_by', 'escaped_by', 'input_fields_terminated_by',
'input_lines_terminated_by', 'input_optionally_enclosed_by',
'properties', 'extra_import_options', 'driver',
'extra_export_options', 'hcatalog_database', 'hcatalog_table',)
@apply_defaults
def __init__(self,
conn_id='sqoop_default',
cmd_type='import',
table=None,
query=None,
target_dir=None,
append=None,
file_type='text',
columns=None,
num_mappers=None,
split_by=None,
where=None,
export_dir=None,
input_null_string=None,
input_null_non_string=None,
staging_table=None,
clear_staging_table=False,
enclosed_by=None,
escaped_by=None,
input_fields_terminated_by=None,
input_lines_terminated_by=None,
input_optionally_enclosed_by=None,
batch=False,
direct=False,
driver=None,
verbose=False,
relaxed_isolation=False,
properties=None,
hcatalog_database=None,
hcatalog_table=None,
create_hcatalog_table=False,
extra_import_options=None,
extra_export_options=None,
*args,
**kwargs):
"""
:param conn_id: str
:param cmd_type: str specify command to execute "export" or "import"
:param table: Table to read
:param query: Import result of arbitrary SQL query. Instead of using the table,
columns and where arguments, you can specify a SQL statement with the query
argument. Must also specify a destination directory with target_dir.
:param target_dir: HDFS destination directory where the data
from the rdbms will be written
:param append: Append data to an existing dataset in HDFS
:param file_type: "avro", "sequence", "text" Imports data to
into the specified format. Defaults to text.
:param columns: <col,col,col> Columns to import from table
:param num_mappers: Use n mapper tasks to import/export in parallel
:param split_by: Column of the table used to split work units
:param where: WHERE clause to use during import
:param export_dir: HDFS Hive database directory to export to the rdbms
:param input_null_string: The string to be interpreted as null
for string columns
:param input_null_non_string: The string to be interpreted as null
for non-string columns
:param staging_table: The table in which data will be staged before
being inserted into the destination table
:param clear_staging_table: Indicate that any data present in the
staging table can be deleted
:param enclosed_by: Sets a required field enclosing character
:param escaped_by: Sets the escape character
:param input_fields_terminated_by: Sets the input field separator
:param input_lines_terminated_by: Sets the input end-of-line character
:param input_optionally_enclosed_by: Sets a field enclosing character
:param batch: Use batch mode for underlying statement execution
:param direct: Use direct export fast path
:param driver: Manually specify JDBC driver class to use
:param verbose: Switch to more verbose logging for debug purposes
:param relaxed_isolation: use read uncommitted isolation level
:param hcatalog_database: Specifies the database name for the HCatalog table
:param hcatalog_table: The argument value for this option is the HCatalog table
:param create_hcatalog_table: Have sqoop create the hcatalog table passed
in or not
:param properties: additional JVM properties passed to sqoop
:param extra_import_options: Extra import options to pass as dict.
If a key doesn't have a value, just pass an empty string to it.
Don't include prefix of -- for sqoop options.
:param extra_export_options: Extra export options to pass as dict.
If a key doesn't have a value, just pass an empty string to it.
Don't include prefix of -- for sqoop options.
"""
super(SqoopOperator, self).__init__(*args, **kwargs)
self.conn_id = conn_id
self.cmd_type = cmd_type
self.table = table
self.query = query
self.target_dir = target_dir
self.append = append
self.file_type = file_type
self.columns = columns
self.num_mappers = num_mappers
self.split_by = split_by
self.where = where
self.export_dir = export_dir
self.input_null_string = input_null_string
self.input_null_non_string = input_null_non_string
self.staging_table = staging_table
self.clear_staging_table = clear_staging_table
self.enclosed_by = enclosed_by
self.escaped_by = escaped_by
self.input_fields_terminated_by = input_fields_terminated_by
self.input_lines_terminated_by = input_lines_terminated_by
self.input_optionally_enclosed_by = input_optionally_enclosed_by
self.batch = batch
self.direct = direct
self.driver = driver
self.verbose = verbose
self.relaxed_isolation = relaxed_isolation
self.hcatalog_database = hcatalog_database
self.hcatalog_table = hcatalog_table
self.create_hcatalog_table = create_hcatalog_table
self.properties = properties
self.extra_import_options = extra_import_options or {}
self.extra_export_options = extra_export_options or {}
[docs] def execute(self, context):
"""
Execute sqoop job
"""
self.hook = SqoopHook(
conn_id=self.conn_id,
verbose=self.verbose,
num_mappers=self.num_mappers,
hcatalog_database=self.hcatalog_database,
hcatalog_table=self.hcatalog_table,
properties=self.properties
)
if self.cmd_type == 'export':
self.hook.export_table(
table=self.table,
export_dir=self.export_dir,
input_null_string=self.input_null_string,
input_null_non_string=self.input_null_non_string,
staging_table=self.staging_table,
clear_staging_table=self.clear_staging_table,
enclosed_by=self.enclosed_by,
escaped_by=self.escaped_by,
input_fields_terminated_by=self.input_fields_terminated_by,
input_lines_terminated_by=self.input_lines_terminated_by,
input_optionally_enclosed_by=self.input_optionally_enclosed_by,
batch=self.batch,
relaxed_isolation=self.relaxed_isolation,
extra_export_options=self.extra_export_options)
elif self.cmd_type == 'import':
# add create hcatalog table to extra import options if option passed
# if new params are added to constructor can pass them in here
# so don't modify sqoop_hook for each param
if self.create_hcatalog_table:
self.extra_import_options['create-hcatalog-table'] = ''
if self.table and self.query:
raise AirflowException(
'Cannot specify query and table together. Need to specify either or.'
)
if self.table:
self.hook.import_table(
table=self.table,
target_dir=self.target_dir,
append=self.append,
file_type=self.file_type,
columns=self.columns,
split_by=self.split_by,
where=self.where,
direct=self.direct,
driver=self.driver,
extra_import_options=self.extra_import_options)
elif self.query:
self.hook.import_query(
query=self.query,
target_dir=self.target_dir,
append=self.append,
file_type=self.file_type,
split_by=self.split_by,
direct=self.direct,
driver=self.driver,
extra_import_options=self.extra_import_options)
else:
raise AirflowException(
"Provide query or table parameter to import using Sqoop"
)
else:
raise AirflowException("cmd_type should be 'import' or 'export'")
[docs] def on_kill(self):
self.log.info('Sending SIGTERM signal to bash process group')
os.killpg(os.getpgid(self.hook.sp.pid), signal.SIGTERM)