从kafka批量读取数据并批量写入到impala数据库代码示例
时间: 2023-05-17 08:03:52 浏览: 206
以下是一个从 Kafka 批量读取数据并批量写入到 Impala 数据库的代码示例:
```python
from kafka import KafkaConsumer
from impala.dbapi import connect
from impala.util import as_pandas
# Kafka 配置
KAFKA_TOPIC = 'my_topic'
KAFKA_BOOTSTRAP_SERVERS = 'localhost:9092'
# Impala 配置
IMPALA_HOST = 'localhost'
IMPALA_PORT = 21050
IMPALA_DATABASE = 'my_database'
IMPALA_TABLE = 'my_table'
# 连接 Kafka
consumer = KafkaConsumer(KAFKA_TOPIC, bootstrap_servers=KAFKA_BOOTSTRAP_SERVERS)
# 连接 Impala
conn = connect(host=IMPALA_HOST, port=IMPALA_PORT, database=IMPALA_DATABASE)
cursor = conn.cursor()
# 批量读取数据并写入 Impala
batch_size = 1000
batch = []
for message in consumer:
value = message.value.decode('utf-8')
batch.append(value)
if len(batch) >= batch_size:
values = ','.join(batch)
query = f"INSERT INTO {IMPALA_TABLE} VALUES {values}"
cursor.execute(query)
batch = []
# 提交事务并关闭连接
conn.commit()
cursor.close()
conn.close()
```
注意:这只是一个示例代码,实际情况下需要根据具体的业务需求进行修改。