Posts (page 107)
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3 min readIn Rust, you can create a folder outside the project directory by using the std::fs module. First, you need to import the module by adding use std::fs; at the beginning of your code. Then, you can use the create_dir_all() function to create a directory and all of its parent directories if they don't already exist.
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8 min readTo best run Hadoop on a single machine, it is important to allocate enough memory and processing power to ensure smooth operations. It is recommended to use a multi-core machine with ample RAM to handle the processing requirements of Hadoop. Additionally, configuring the Hadoop setup to use local disk storage instead of network storage can improve performance.
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4 min readTo calculate a multiple factorial using num_bigint in Rust, you can create a function that takes an input value n of type BigInt and returns the multiple factorial. First, you need to import the num_bigint crate in your Rust project. Then, you can implement the function by iterating over the range from 2 to n and multiplying each number in the range with the original BigInt value n. Finally, return the result as a BigInt value.
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10 min readMigrating from Teradata to Hadoop can offer several benefits for organizations. Hadoop provides a more scalable, flexible, and cost-effective solution for storing and analyzing large volumes of data. Unlike Teradata, which requires expensive hardware and licensing fees, Hadoop is built on open-source software and can be deployed on commodity hardware.
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4 min readTo deserialize referencing keys from a JSON into a struct in Rust, you can use the serde library along with the serde_json crate. First, define a struct that represents the JSON data you want to deserialize. Make sure that the fields in your struct match the keys in the JSON data.Next, implement the Deserialize trait for your struct using the serde macros. You can use the #[serde(rename = "...")] attribute to match struct fields with different JSON keys.
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8 min readTo integrate Hadoop with Zookeeper and HBase, you need to ensure that each component is properly configured and set up to work seamlessly together. Hadoop is a big data processing framework, Zookeeper is a distributed coordination service, and HBase is a distributed NoSQL database that runs on top of Hadoop.First, you need to install and configure Hadoop, Zookeeper, and HBase on your system or cluster of machines.
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4 min readTo run both a server and client using Tonic in Rust, you first need to create a new Rust project and add the Tonic crate as a dependency in your Cargo.toml file. Then, you can define your service using the tonic_build macro and implement the service trait on a struct.For the server, you can create a new tokio runtime, bind an address, and serve your service using Tonic's server module.
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7 min readTo stream data from MongoDB to Hadoop, you can use Apache Kafka as a middle layer between the two systems. Apache Kafka can act as a messaging system to continuously stream data from MongoDB to Hadoop in real-time.First, set up Apache Kafka to create a topic for the data transfer. Then, use a Kafka connector to connect MongoDB to Kafka and stream data from MongoDB collections to the Kafka topic.Next, configure Apache Hadoop to consume data from the Kafka topic.
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6 min readTo import functions from subfolders in Rust, you can use the mod keyword to create a module for each subfolder and then use the use keyword to import functions from those modules.First, create a new module inside the main.rs file for each subfolder by using the mod keyword followed by the name of the subfolder. Then, use the use keyword to import the functions from the subfolder's module into your main.rs file.For example, if you have a subfolder named utils with a file named math.
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4 min readTo get absolute paths in Hadoop Filesystem, you can use the getUri() method of the FileSystem class. This method returns the URI of the FileSystem object, which represents the absolute path of the Hadoop Filesystem. You can then use this URI to get the absolute path of a file or directory within the Hadoop Filesystem.
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7 min readIn Rust, you can generate random numbers in an async function using the rand crate. To do this, you can include the rand crate in your Cargo.toml file and then import it into your code using the crate's macros.Next, you can create a new thread-local RNG (Random Number Generator) using the rand::thread_rng() function. This function returns a RNG that is seeded by the operating system.You can then use this RNG to generate random numbers using the gen_range() function.
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3 min readHadoop reducer is a crucial component in the Hadoop MapReduce framework that is responsible for processing and combining the intermediate key-value pairs generated by the mappers. Reducers receive input from multiple mappers and work to aggregate and reduce the data before writing the final output. Reducers perform the reduce function by grouping key-value pairs based on their keys and then applying the reduce function to each group.