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import json
from airflow.hooks.druid_hook import DruidHook
from airflow.models import BaseOperator
[docs]class DruidOperator(BaseOperator):
"""
Allows to submit a task directly to druid
:param json_index_file: The filepath to the druid index specification
:type json_index_file: str
:param druid_ingest_conn_id: The connection id of the Druid overlord which
accepts index jobs
:type druid_ingest_conn_id: str
"""
template_fields = ('index_spec_str',)
template_ext = ('.json',)
def __init__(self, json_index_file,
druid_ingest_conn_id='druid_ingest_default',
max_ingestion_time=None,
*args, **kwargs):
super(DruidOperator, self).__init__(*args, **kwargs)
self.conn_id = druid_ingest_conn_id
self.max_ingestion_time = max_ingestion_time
with open(json_index_file) as data_file:
index_spec = json.load(data_file)
self.index_spec_str = json.dumps(
index_spec,
sort_keys=True,
indent=4,
separators=(',', ': ')
)
[docs] def execute(self, context):
hook = DruidHook(
druid_ingest_conn_id=self.conn_id,
max_ingestion_time=self.max_ingestion_time
)
self.log.info("Sumitting %s", self.index_spec_str)
hook.submit_indexing_job(self.index_spec_str)