Posts (page 184)
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6 min readTo unzip a file in Hadoop, you can use the Hadoop File System (HDFS) command line tools. First, you need to upload the zipped file to your Hadoop cluster using the HDFS command. Once the file is uploaded, you can use the HDFS command to unzip the file.
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5 min readIn Rust, you can get the local time zone name by using the chrono crate. First, you need to add "chrono" to your dependencies in your Cargo.toml file. Then, you can use the chrono::Local::now().timezone() method to get the local time zone name. This method returns a TimeZone object, which has a name() method that will give you the local time zone name.
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9 min readWhen setting up a Hadoop installation, it is common to encounter warnings that may need to be addressed in order to ensure proper functionality. Some common warnings include issues with network connectivity, configuration settings, and compatibility with specific software versions.To fix warnings in a Hadoop installation, it is important to carefully review the error messages and logs to identify the root cause of the problem.
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5 min readTo fill a Rust function pointer from C++, you would first need to define a function in Rust that you want to call from C++. This function should be marked as extern "C" to expose it as a C-compatible function.Next, in your C++ code, you can declare a function pointer that matches the signature of your Rust function. Then, you can assign this function pointer to the address of the Rust function using the ::std::mem::transmute function.
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4 min readWhen a file in Hadoop becomes corrupted, it can be challenging to view its contents. One approach is to use the HDFS fsck command to identify corrupted files and then try to recover the data by using the HDFS -get command to retrieve a copy of the corrupted file. It is also possible to use tools like Hadoop streaming or Hadoop MapReduce to process the corrupted file and extract the data. Additionally, some third-party tools and libraries may be helpful in viewing corrupted files in Hadoop.
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6 min readTo connect ScyllaDB from Rust, you can use the scylla.rs client library provided by the ScyllaDB team. This library allows you to interact with the ScyllaDB database from your Rust application. First, you need to add the scylla-rs crate to your Cargo.toml file as a dependency. Then, you can use the library to establish a connection to the ScyllaDB cluster, execute queries, and fetch results.
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6 min readTo submit multiple jobs to a Hadoop cluster, you can use a tool like Apache Oozie. Oozie is a workflow scheduler system that allows users to define workflows that specify the order of execution for a series of Hadoop jobs.To submit multiple jobs to a Hadoop cluster using Oozie, you first need to define your workflow in an XML file. This file will specify the jobs to run, their dependencies, and any other relevant information.
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6 min readIn Rust, dependencies for a macro can be set using the #[macro_use] attribute before importing the crate that contains the macro. This attribute enables the use of macros defined in the specified crate without having to import them explicitly in each module where they are used. By using #[macro_use], the macro can be accessed globally throughout the crate and its dependencies.
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8 min readWhen writing "non-assert" debugging code in Rust, it is important to consider using the debug_assert!() macro instead of assert!() to avoid impacting the performance of the final optimized release build. This macro allows you to define assertions that will only be evaluated in debug builds and will be eliminated by the compiler in release builds.Additionally, you can use the debug_assert_eq.
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6 min readIn Rust, writing to a file from different threads can be done safely using the std::fs::File type wrapped in a Mutex. This allows multiple threads to access the file and write to it concurrently without risking data corruption. The std::sync::Mutex type enforces thread safety by allowing only one thread to access the file at a time.To write to a file from different threads in Rust, you can create a Mutex around the File type and lock it before writing to the file.
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3 min readTo duplicate a rust stream, you will need to create a new stream object that reads from the same source as the original stream. This can be done by using a combination of methods such as clone() or duplicate() depending on the programming language you are using. Once you have duplicated the stream, you can use the new stream object to read and write data independently from the original stream.
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5 min readIn Rust, you can declare a public static pointer using the static keyword. To declare a public static pointer, you first need to define the type of the pointer.