Posts (page 111)
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5 min readIn Rust, it is possible to define functions that accept default generic type parameters. This can be achieved by specifying a default type for the generic parameter in the function definition.
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4 min readIn Hadoop, the number of map tasks that are created is determined by the size of the input data. Each map task is responsible for processing a portion of the input data and producing intermediate key-value pairs. The framework automatically determines the number of map tasks based on the data size and the default block size of the Hadoop Distributed File System (HDFS). The goal is to evenly distribute the workload across all available nodes in the cluster to ensure efficient processing.
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5 min readTo decompress gzip (gz) files in Hadoop, you can use the Hadoop command line tools or MapReduce programs. You can use the 'hadoop fs -cat' command to decompress the gz files and then pipe the output to another command or save it to a new file. Another option is to use the 'hdfs dfs -text' command to view the content of the gz files directly. Also, you can create a custom MapReduce program to decompress the gz files in Hadoop by setting the input format class to 'org.apache.
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5 min readIn a Hadoop MapReduce job, the Reducer phase gets invoked after the Mapper phase has completed. The Reducer is responsible for collecting and aggregating the output data from the various mapper tasks and then performing the final processing and outputting the result. The Reducer function is called for each unique key produced by the Mapper and receives a list of values associated with that key. This allows the Reducer to combine and summarize the data based on the keys.
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4 min readIn Hadoop, you can pass multiple files for the same input parameter by specifying a directory as the input path instead of individual files. Hadoop will automatically process all files within the specified directory as input for the job. This allows you to efficiently handle multiple files without having to specify each file individually. Additionally, you can also use file patterns (e.g., wildcards) to match multiple files based on a common pattern or prefix.
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5 min readTo screen for stocks with strong revenue growth, investors should look for companies that have consistently increasing revenue over a period of time. This can be done by analyzing the company's financial statements and quarterly earnings reports to identify the trends in revenue growth. Additionally, investors can also look at analyst forecasts and recommendations to determine if the company is expected to continue growing in the future.
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3 min readTo navigate directories in Hadoop HDFS, you can use the command line interface tools provided by Hadoop such as the hdfs dfs command. You can use commands like hdfs dfs -ls to list the contents of a directory, hdfs dfs -mkdir to create a new directory, hdfs dfs -cp to copy files or directories, hdfs dfs -mv to move files or directories, and hdfs dfs -rm to delete files or directories.
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4 min readTo find stocks with high short interest, investors can consider looking at data sources such as financial news websites, stock market research platforms, and stock screeners. Short interest refers to the percentage of a company's total shares that are being sold short by investors betting that the stock price will decrease.
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5 min readHadoop reads all the data in a file by using input format classes like TextInputFormat or SequenceFileInputFormat. These classes define how data is read from the input source, such as a file system. Once the data is read, it is split into smaller chunks called input splits. Each input split represents a portion of the data that can be processed independently by a mapper task. The size of the input splits is determined by the block size of the underlying file system.
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8 min readOne way to screen for stocks with positive earnings surprises is to focus on companies that have consistently surpassed analyst earnings estimates in recent quarters. This can be done by examining past earnings reports and identifying companies that have shown a pattern of exceeding expectations.Additionally, you can look for companies that have a track record of strong revenue growth and profitability.
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5 min readOne way to find healthcare stocks using a stock screener is to look for specific criteria related to the healthcare industry. This can include searching for companies within the healthcare sector, such as pharmaceutical companies, biotech firms, medical device manufacturers, and healthcare providers.
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8 min readUsing a stock screener for technical analysis involves specifying certain criteria to filter and screen stocks that meet your trading strategy. First, you need to identify the technical indicators that you want to analyze, such as moving averages, relative strength index (RSI), or MACD. Then, you can input these indicators into the stock screener to search for stocks that exhibit specific technical patterns or signals.