Posts (page 110)
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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.
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3 min readTo match an IP host from a Rust URL, you can use a combination of regular expressions and string manipulation. First, extract the hostname part of the URL using a library like url::Url in Rust. Then, use a regular expression to match only the IP address from the string. You can do this by using a regex pattern that matches a valid IP address format. Once you have extracted the IP address, you can compare it with the desired IP host to see if they match.
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6 min readWhen running a Hadoop job, you can specify the output directory where the results of the job will be stored. By default, if the output directory already exists, Hadoop will throw an error and the job will not run. However, you can use the "-Dmapreduce.job.output.dir.overwrite=true" option when running the job to force Hadoop to overwrite the output directory if it already exists.
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4 min readTo use a clone in a Rust thread, simply call the clone() method on the data you want to pass to the thread. This will create a new copy of the data that can be safely transferred to the thread. Keep in mind that cloning data can be expensive in terms of performance, so it is important to only clone data when necessary. Additionally, Rust's ownership and borrowing system ensures that cloned data is not shared between threads, preventing data races and other concurrency issues.
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8 min readTo install Kafka on a Hadoop cluster, you first need to make sure that you have a Hadoop cluster set up and running properly. Once you have your Hadoop cluster ready, you can begin the installation process for Kafka.Download the Kafka binaries from the official Apache Kafka website.Extract the Kafka binaries to a directory on your Hadoop cluster nodes.Configure the Kafka properties file (server.properties) to specify the broker id, hostname, port, log directories, and other configurations.