Posts (page 98)
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9 min readIn Hadoop jobs, it is important to keep track of the state of the job to ensure that it is running efficiently and effectively. One way to keep a state in Hadoop jobs is to use counters, which are built-in mechanisms that allow you to track the progress of a job by counting various events or occurrences.Another way to keep a state is to store the state in a separate database or file system, such as HBase or HDFS, that can be accessed by the job throughout its execution.
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7 min readTo assign values to a specific slice of a tensor in TensorFlow, you can use the tf.tensor_scatter_nd_update() function. This function takes in the original tensor, an index tensor specifying the location of the values to update, and a values tensor containing the new values to assign.First, create an index tensor that specifies the slice you want to update. This tensor should have the same rank as the original tensor and the same shape as the slice you want to update. You can use tf.
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6 min readTo install Kafka in a Hadoop cluster, you first need to make sure that both Hadoop and Zookeeper are already installed and configured properly. Then, you can download the Kafka binaries from the Apache Kafka website and extract the files to a directory on your Hadoop cluster nodes.Next, you will need to configure the Kafka server properties file to point to your Zookeeper ensemble and set other necessary configurations such as the broker id, log directory, and port number.
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6 min readTo split a model between two GPUs using Keras in TensorFlow, you can use the tf.distribute.Strategy API. This API allows you to distribute the computation of your model across multiple devices, such as GPUs.First, you need to create a MirroredStrategy object which represents the synchronization strategy for distributing a model across multiple devices. Then, you can use this strategy to define and compile your model.
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4 min readA sequence file in Hadoop is a specific file format that is used for storing key-value pairs in a binary format. It is commonly used in Hadoop to store data that needs to be processed efficiently and in a compact manner. Sequence files can be used to store large amounts of data in a way that is optimized for reading and writing by Hadoop applications. They are typically used for intermediate data storage during map-reduce jobs or for storing data that needs to be accessed in a specific order.
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2 min readTo generate a dataset using tensors in TensorFlow, you can use the tf.data.Dataset.from_tensor_slices() method. This method takes a tensor and creates a dataset with each element being a slice of the tensor along the first dimension. You can then further manipulate the dataset using various methods provided by the tf.data module, such as shuffle, batch, and map.
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7 min readTo import XML data into Hadoop, you can follow these steps:Parse the XML data: You can use tools like Apache Tika or XML parsers in programming languages like Java or Python to parse the XML data. Convert XML data to a structured format: Once the XML data is parsed, you may need to convert it into a structured format like CSV or JSON that can be easily processed by Hadoop.
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3 min readTo read a Keras checkpoint in TensorFlow, you first need to create a Keras model using the same architecture as the model that was used to save the checkpoint. Next, you can load the weights from the checkpoint by calling the load_weights method on the model and passing the path to the checkpoint file as an argument. This will restore the model's weights to the state they were in when the checkpoint was saved.
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4 min readTo unzip .gz files in a new directory in Hadoop, you can use the Hadoop FileSystem API to programmatically achieve this task. First, you need to create a new directory in Hadoop where you want to unzip the .gz files. Then, you can use the Hadoop FileSystem API to read the .gz files, unzip them, and write the uncompressed files to the new directory. You can also use shell commands or Hadoop command-line tools like hdfs dfs -copyToLocal to copy the .
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5 min readTo use only one GPU for a TensorFlow session, you can set the environment variable CUDA_VISIBLE_DEVICES before running your Python script. This variable determines which GPU devices are visible to TensorFlow.For example, if you want to use only GPU 1, you can set CUDA_VISIBLE_DEVICES to 1 before running your script: export CUDA_VISIBLE_DEVICES=1 python your_script.py This will restrict TensorFlow to only use GPU 1 for the session, ignoring other available GPUs.
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3 min readTo check the Hadoop server name, you can open the Hadoop configuration files located in the conf directory of your Hadoop installation. Look for core-site.xml or hdfs-site.xml files where the server name will be specified. Additionally, you can also use the command "hdfs getconf -nnRpcAddresses" in the Hadoop terminal to retrieve the server name. This command will display the hostname and port number of the Hadoop NameNode.
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6 min readTo submit a Hadoop job from another Hadoop job, you can use the Hadoop JobControl class in the org.apache.hadoop.mapred.control package. This class allows you to control multiple job instances and their dependencies.You can create a JobControl object and add the jobs that you want to submit to it using the addJob() method. You can then use the run() method of the JobControl object to submit the jobs for execution. The run() method will wait for the jobs to complete before returning.