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In Apache Spark, Accumulators are shared variables that can only be "added" to through an associative and commutative operation. They are primarily us
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posted @ 2025-12-22 15:38
ZhangZhihuiAAA
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What's the difference between binlog and redolog? In MySQL, the binlog (binary log) and redolog (redo log) are often confused because they both record
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posted @ 2025-12-22 11:26
ZhangZhihuiAAA
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Installing the Kafka Schema Registry typically involves using the Confluent Platform distribution, as the registry is a Confluent-led project. You can
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posted @ 2025-12-19 09:20
ZhangZhihuiAAA
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A Kafka Schema Registry is essentially a "librarian" for your data structures. Since Kafka brokers only see messages as raw byte arrays, they don’t ca
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posted @ 2025-12-19 09:06
ZhangZhihuiAAA
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At its core, a Python dataclass (introduced in Python 3.7) is a decorator used to automatically generate "boilerplate" code for classes that primarily
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posted @ 2025-12-18 21:34
ZhangZhihuiAAA
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from pyflink.table import TableEnvironment, EnvironmentSettings settings = EnvironmentSettings.in_streaming_mode() t_env = TableEnvironment.create(set
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posted @ 2025-12-18 16:26
ZhangZhihuiAAA
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tokenizer = Tokenizer(inputCol='text', outputCol='tokens') remover = StopWordRemover(inputCol='tokens', outputCol='filtered') encoder = OneHotEncoder(
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posted @ 2025-12-18 09:21
ZhangZhihuiAAA
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Airflow's test connection feature is disabled. How to enable it? In Airflow 3.1.3, the Test Connection button and functionality is disabled by default
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posted @ 2025-12-17 20:26
ZhangZhihuiAAA
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I wanted to create a connection to PostgreSQL in Airflow, but found that there's no Postgres connection type. Why? My Airflow version is 3.1.3. This i
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posted @ 2025-12-17 20:15
ZhangZhihuiAAA
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既然你提到了这四个核心组件，我们可以通过一个**“现代物流中心”的比喻，一次性理清它们之间的存储、处理、查询和实时响应**的协作关系。 1. 核心关系图解 如果把大数据处理看作一个物流系统： Hadoop (HDFS) 是大仓库的物理建筑。它提供了最底层的空间，把货物（数据）存在地窖或货架上。 Hi
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posted @ 2025-12-17 16:57
ZhangZhihuiAAA
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