Source code for airflow.hooks.pig_hook

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from __future__ import print_function
import subprocess
from tempfile import NamedTemporaryFile

from airflow.exceptions import AirflowException
from airflow.hooks.base_hook import BaseHook
from airflow.utils.file import TemporaryDirectory

[docs]class PigCliHook(BaseHook): """ Simple wrapper around the pig CLI. Note that you can also set default pig CLI properties using the ``pig_properties`` to be used in your connection as in ``{"pig_properties": "-Dpig.tmpfilecompression=true"}`` """ def __init__( self, pig_cli_conn_id="pig_cli_default"): conn = self.get_connection(pig_cli_conn_id) self.pig_properties = conn.extra_dejson.get('pig_properties', '') self.conn = conn
[docs] def run_cli(self, pig, pig_opts=None, verbose=True): """ Run an pig script using the pig cli >>> ph = PigCliHook() >>> result = ph.run_cli("ls /;", pig_opts="-x mapreduce") >>> ("hdfs://" in result) True """ with TemporaryDirectory(prefix='airflow_pigop_') as tmp_dir: with NamedTemporaryFile(dir=tmp_dir) as f: f.write(pig.encode('utf-8')) f.flush() fname = pig_bin = 'pig' cmd_extra = [] pig_cmd = [pig_bin] if self.pig_properties: pig_properties_list = self.pig_properties.split() pig_cmd.extend(pig_properties_list) if pig_opts: pig_opts_list = pig_opts.split() pig_cmd.extend(pig_opts_list) pig_cmd.extend(['-f', fname] + cmd_extra) if verbose:"%s", " ".join(pig_cmd)) sp = subprocess.Popen( pig_cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, cwd=tmp_dir, close_fds=True) self.sp = sp stdout = '' for line in iter(sp.stdout.readline, b''): stdout += line.decode('utf-8') if verbose: sp.wait() if sp.returncode: raise AirflowException(stdout) return stdout
[docs] def kill(self): if hasattr(self, 'sp'): if self.sp.poll() is None: print("Killing the Pig job") self.sp.kill()

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