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After comparing different guides on the internet, I ended up my own version base on the Hadoop official guide with manual download. If you prefer Homebrew, this one would be your best choice. Actually there is no difference in the configuration of these two methods except the file directories. Here I extend the official guide by more details in case you need it.

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Also, this guide is part of my Hadoop tutorial 1. It aims to setting up the pseudo-distributed mode in single node cluster. And I will explain the HDFS configurations and command lines in Hadoop tutorial 2.

1. Required software

1) Java

Run the following command in a terminal:

If Java is already installed, you can see a similar result like:

If not, the terminal will prompt you for installation or you can download Java JDK here.

2) SSH

First enable Remote Login in System Preference -> Sharing.

Now check that you can ssh to the localhost without a passphrase:

If you cannot ssh to localhost without a passphrase, execute the following commands:

2. Get a Hadoop distribution

You can download it from Apache Download Mirror.

3. Prepare to start the Hadoop cluster

1) Unpack the downloaded Hadoop distribution.

2) Run the following command to figure out where is your Java home directory:

You can see a result like:

3) In the distribution, edit the file etc/hadoop/hadoop-env.sh to define some parameters as follows:

4) Try the following command:

This will display the usage documentation for the hadoop script.

Now you are ready to start your Hadoop cluster in one of the three supported modes:

• Standalone mode
• Pseudo-distributed mode
• fully-distributed mode

We will go through pseudo-distributed mode and run a MapReduce job on YARN here. In this mode, Hadoop runs on a single node and each Hadoop daemon runs in a separate Java process.

4. Configuration

Edit following config files in your Hadoop directory

1) etc/hadoop/core-site.xml:

2) etc/hadoop/hdfs-site.xml:

3) etc/hadoop/mapred-site.xml:

4) etc/hadoop/yarn-site.xml:

5. Execution

1) Format and start HDFS and YARN

Format the filesystem:

Start NameNode daemon and DataNode daemon:

Now you can browse the web interface for the NameNode at - http://localhost:50070/

Make the HDFS directories required to execute MapReduce jobs:

Start ResourceManager daemon and NodeManager daemon:

Browse the web interface for the ResourceManager at - http://localhost:8088/

2) Test examples code that came with the hadoop version

Copy the input files into the distributed filesystem:

Run some of the examples provided:

This example counts the words starting with 'dfs' in the input.

Examine the output files:

Copy the output files from the distributed filesystem to the local filesystem and examine them:

or View the output files on the distributed filesystem:

You can see the result like:

3) Stop YARN and HDFS

When you're done, stop the daemons with:

PyCharm integrates with the npm, Yarn, Yarn 2, and pnpm, so you can install, locate, update, and remove packages of reusable code from inside the IDE. The Node.js and NPM page provides a dedicated UI for managing packages. Of course, you can also do that from the command line in the built-in Terminal.

PyCharm also lets you run and debug npm, Yarn, and pnpm scripts. PyCharm parses package.json files, recognizing definitions of scripts, shows scripts in a tree view, and lets you navigate between a script in the tree and its definition in the package.json file. See npm, Yarn, and pnpm official web sites for details.

PyCharm detects projects with Yarn workspaces and indexes all the dependencies that are listed in the package.json files of the workspaces but are located in the root node_modules folder.

Before you start

• Download and install Node.js. Note that npm is also installed, so if you are going to use it, you are through with the preliminary steps.

• To use Yarn, install it as described on the Yarn official website.

• To use pnpm, open the embedded Terminal (Alt+F12) and type:

  npm install --g pnpm

  Learn more from the pnpm official website.

Choose a project package manager

With PyCharm, you can choose whether to use npm, Yarn, Yarn 2, or pnpm in a project.

By default, PyCharm suggests npm. However if you open a project with a yarn.lock file and Yarn is installed on your computer, PyCharm automatically changes the package manager for this project to Yarn.

Accordingly, if you open a project with a pnpm-lock file and pnpm is installed on your computer, PyCharm automatically changes the package manager for this project to pnpm.

You can also set Yarn 1 or pnpm as default PyCharm package manager.

1. In the Settings/Preferences dialog Ctrl+Alt+S, go to Languages and Frameworks | Node.js and NPM. The Node.js and NPM page opens.

2. In the Package manager field, specify the package manager for your project.

   • Select npm, yarn, or pnpm to use the system default installation.

     PyCharm uses the npm, yarn, and pnpm aliases for the current system paths to these managers. If you choose another Node.js version, PyCharm also changes the npm aliased path to point to the npm version bundled with the selected Node.js version.

   • To use a custom installation of a package manager, click Select, and select the installation folder of the relevant package manager.

   PyCharm automatically uses the chosen package manager when you select the Project alias from the Package manager list in the Run/Debug Configuration: NPM dialog. PyCharm also uses the path to the chosen package manager every time you invoke the Run 'npm install'/ Run 'yarn install'/ Run 'pnpm install' command or run an npm/Yarn/pnpm script, see Running and debugging scripts for details.

Set up Yarn 2 in your project

1. Make sure you have Yarn 1 installed globally and enable Yarn 2 in your project as described on the Yarn official website. Use the embedded TerminalAlt+F12 to type the commands.

2. In the Settings/Preferences dialog Ctrl+Alt+S, go to Languages and Frameworks | Node.js and NPM and select the path to the Yarn 2 package in your project from the Package manager list.

Set Yarn 1 or pnpm as the default PyCharm package manager

1. Open the Settings for New Projects dialog (File | Settings for New Projects) and go to Languages and Frameworks | Node.js and NPM.

2. On the Node.js and NPM page that opens, select yarn or pnpm from the Package manager list.

After that, PyCharm will suggest the selected package manager (Yarn or pnpm) as default every time you create a new project.

Edit package.json

PyCharm helps you handle your project dependencies in package.json files providing extensive coding assistance.

• Code completion for package names.

• Information on the latest available package version.

• Information about the range of versions that can be installed through npm install @ or yarn add @. `Note that running npm install or yarn install will install the latest available version from this range.

  Press Ctrl and hover over the version to see the information in a tooltip. See the npm Official documentation for details about semantic versioning.

• Code completion for previous package versions. When you press Ctrl+Space or start typing a version different from the latest one, PyCharm displays a suggestion list with all the previous versions of the package.

• Quick documentation look-up for packages.

  PyCharm also shows readme files for npm packages when you invoke documentation look-up from require or import statements.

Install and update packages

Mac Os Yarn

As you may know, npm can install packages both globally or as project dependencies or development dependencies, learn more from the npm official website.

pnpm also installs packages globally or as project dependencies or development dependencies, learn more from the pnpm official website.

With Yarn, you can install packages globally or as project dependencies, see Yarn official website for details.

In PyCharm, packages can be installed in the editor, from a package.json file, in the built-in TerminalAlt+F12, or on the Node.js and npm page.

From package.json

Install your project dependencies

• Click the Run 'npm install', Run 'yarn install', or Run 'pnpm install' link in the popup:

  PyCharm shows this popup when the dependencies are not installed yet or when they have changed. If you close the popup or turn it off by choosing Don't ask again, you can still install the dependencies using the Run ' install' action or in the built-in terminal.

  If you have accidentally dismissed this notification and now want to get it back, press Ctrl+Shift+A, start typing Enable notifications, and select Enable Notifications about Installing Dependencies from package.json from the list.

• Alternatively, open the relevant package.json file in the editor or select it in the Project tool window and choose Run 'npm install' from the context menu.

Update your project dependencies

• Click Run ' install' in the popup.

  PyCharm shows this popup every time you open a project, update it from the version control, or edit a package.json.

  PyCharm also runs an inspection that checks whether the packages from dependencies or devDependencies are installed and their versions match the specified range. If the inspection detects any mismatch, it suggests a quick-fix. To apply it, click the Run ' install' link.

In the built-in Terminal

In the embedded Terminal (Alt+F12), type one of the following commands:

• For global installation:

  • npm install --global

  • yarn global add

  • pnpm --global add

• To install a package as a project dependency or a development dependency:

  • npm install --save or npm install --save-dev

  • yarn add --dev

  • pnpm add --save-dev

Install all dependencies listed in a package.json file

In the embedded Terminal (Alt+F12), type one of the following commands:

• npm install

• yarn install

• pnpm install

As a result you get all the dependencies listed in the package.json from the current folder. Learn more from Editing package.json.

For packages installed via Yarn 2, PyCharm shows yarn:package.json:< package name> instead of the actual path to a package. Note that this format is used only for presenting a package in the Settings dialog but not for specifying its location in your code or elsewhere.

On the Node.js and NPM page

PyCharm shows all the currently installed packages on the Node.js and NPM page. To open the page, in the Settings/Preferences dialog Ctrl+Alt+S, go to Languages and Frameworks | Node.js and NPM.

Globally installed packages are listed on top. For each package, PyCharm shows its currently installed version and the latest available version.

Install a package

1. Click and in the Available Packages dialog that opens, select the required package.

2. By default, the latest package version is installed. To install another one, select the Specify version checkbox and choose the required version from the list.

3. The default installation is local. To use another installation type, select the Options checkbox and type -g for global installation or --save/ --save-dev to install the package as a dependency/development dependency. Learn more from the npm and Yarn official websites.

View the location of a package

• Hover the mouse pointer over the package name. PyCharm shows the path to the package in a tooltip.

Update a package to the latest version

• Select the package in the list and click .

Remove a package

• Select the package in the list and click .

Run and debug scripts

You can launch npm, Yarn, or pnpm scripts from a package.json file in the editor, from a tree of scripts in the dedicated npm tool window, according to a dedicated run configuration, or automatically, as a start-up or a before-launch task.

The results of script execution are displayed in the Run tool window. The tool window shows the npm or Yarn script output, reports the errors occurred, lists the packages or plugins that have not been found, etc. The name of the last executed script is displayed on the title bar of the tool window.

If you launch a script debugging session, PyCharm opens the Debug tool window.

During a script debugging session, you can step through the script, stop and resume the script execution, examine it when suspended, run JavaScript code snippets in the Debugger Console, and so on.

Run and debug scripts from package.json

PyCharm lets you quickly launch single scripts from package.json files. To run or debug several scripts, use a run configuration or the npm tool window.

• Open the package.json file in the editor, click in the gutter next to the script, and choose Run or Debug from the context menu.

• You can also run a script by pressing Ctrl+Shift+F10.

The script output is shown in the Run tool window.

If you launch a script in the debug mode, PyCharm opens the Debug tool window, where you can step through the script, stop and resume the script execution, examine it when suspended, run JavaScript code snippets in the Debugger Console, and so on.

Run and debug scripts from the npm tool window

The npm tool window opens when you select a package.json file in the Project tool window or open it in the editor and select Show npm Scripts from the context menu.

As soon as you invoke npm, pnpm, or Yarn, the tool starts building a tree of scripts defined within the scripts property of the package.json file on which it was invoked.

If you have several package.json files in your project, you can build a separate script tree for each of them and run scripts without dropping the previously built trees. Each tree is shown under a separate node.

Open the npm tool window if it is not opened yet

• Select the required file in the Project tool window or open it in the editor and choose Show npm Scripts from the context menu.

  The npm tool window opens showing the scripts tree built according to the selected or opened package.json file.

Build a tree of scripts in an already opened npm tool window

1. In the npm tool window, click on the toolbar and choose the required package.json file from the list. By default, PyCharm shows the package.json file in the root of your project.

2. If you have another package.json file, click Choose package.json and select the package.json file you need in the dialog that opens. PyCharm adds a new node with the path to the chosen package.json file on its title and builds a scripts tree under the new node.

Re-build a tree

• Switch to the required node and click on the toolbar.

Sort the scripts in a tree by their names

• Click on the toolbar, choose Sort by from the menu, and then choose Name.
  By default, a tree shows the scripts in the order in which they are defined in package.json (option Definition order ).

Run one script

• Double-click the script.

• Select the script in the tree and press Enter or choose Run </span> from the context menu. <a href='https://tomfree.mystrikingly.com/blog/one-thousand-lies-itch-mac-os'>One thousand lies (itch) mac os</a>.</p></li></ul><h3>Debug one script</h3><ul><li><p>Select the script in the tree and choose <span>Debug <script_name></span> from the context menu.</p><p>PyCharm opens the Debug tool window where you can step through the script, <span>stop and resume</span> the script execution, examine it when suspended, run JavaScript code snippets in the Debugger Console, and so on.</p></li></ul><h3>Run or debug several scripts</h3><ul><li><p> Use the multiselect mode: hold <kbd>Shift</kbd> (for adjacent items) or <kbd>Ctrl</kbd> (for non-adjacent items) keys and select the required scripts, then choose <span>Run</span> or <span>Debug</span> from the context menu of the selection.</p></li></ul><h2 id='yarn-macos'>Yarn Macos</h2><h3>Run and debug scripts by a run configuration</h3><p>When you run or debug scripts from the editor or from the <span>npm</span> tool window, PyCharm automatically creates <span>temporary</span> run configurations. Besides using them, you can create and launch your own npm run configurations.</p><ol><li><p> From the main menu, select <span>Run | Edit Configuration</span>.</p></li><li><p> Click on the toolbar and select <span>npm</span> from the list. The Run/Debug Configuration: npm dialog opens.</p></li><li><p>Specify the CLI command to execute, the scripts to run (use blank spaces as separators), and the location of the <span>package.json</span> file where these scripts are defined. Optionally, type the command-line arguments for executing the scripts.</p></li><li> Specify the Node.js interpreter to use. This can be a local Node.js interpreter or a Node.js on Windows Subsystem for Linux.<p> Optionally, specify the Node.js-specific option parameters and the environment variables to be passed to Node.js.</p></li><li><p> Specify the package manager to use. If you choose the <code>Project</code> alias, PyCharm will use the default project package manager from the Node.js page. You can also choose the relevant package alias (<span>npm</span> or <span>yarn</span>) or specify an explicit path to a custom installation of a package manager.</p></li><li><p>Select the newly created run configuration from the list on the toolbar and then click or next to the list.</p><p>The results of script execution are displayed in the Run tool window.</p><p>If you click , PyCharm opens the Debug tool window, where you can step through the script, <span>stop and resume</span> the script execution, examine it when suspended, run JavaScript code snippets in the Debugger Console, and so on.</p></li></ol><h3>Run scripts with Run Anything</h3><h2 id='yarn-mac-os-download'>Yarn Mac Os Download</h2><p><span>Run Anything</span> is a quick way to start scripts.</p><ol><li><p>Press <kbd>Ctrl</kbd> twice or click on the Navigation bar. The <span>Run Anything</span> popup opens.</p></li><li><p>Type <code>npm run</code> or <code>yarn run</code> in the search field. As you type, PyCharm shows the matching scripts. Select the required one from the list and press <kbd>Enter</kbd>.</p><p>To view the command output in the <span>Run</span> tool window, press <kbd>Ctrl+Enter</kbd>, to show the output in the <span>Debug</span> tool window, press <kbd>Shift+Enter</kbd>.</p></li></ol><h3>Run scripts automatically on start-up</h3><h2 id='yarn-mac-os-catalina'>Yarn Mac Os Catalina</h2><p> If you have some scripts that you run on a regular basis, you can add the corresponding run configurations to a list of <span>startup tasks</span>. The tasks will be executed automatically on the project start-up.</p><ol><li><p> In the <span>Settings/Preferences</span> dialog <kbd>Ctrl+Alt+S</kbd>, go to <span>Tools | Startup Tasks</span>.</p></li><li><p>On the Startup Tasks page that opens, click on the toolbar.</p></li><li><p>From the list, choose the required <span>npm</span> run configuration. The configuration is added to the list.</p><p>If no applicable configuration is available in the project, click and choose <span>Edit Configurations</span>. Then define a configuration with the required settings on the Run/Debug Configuration: NPM page that opens. When you save the new configuration it is automatically added to the list of startup tasks.</p></li></ol><h2 id='yarn-mac-os-pro'>Yarn Mac Os Pro</h2><h3>Run scripts as before-launch tasks</h3><ol><li><p>Open the Run/debug configurations dialog dialog by choosing <span>Run | Edit Configurations</span> from the main menu, and select the required configuration from the list or create it anew by clicking and choosing the relevant run configuration type.</p></li><li><p>In the dialog that opens, click in the <span>Before launch</span> area and choose <span>Run npm script</span> from the list.</p></li><li><p> In the <span>NPM Script</span> dialog that opens, specify the npm run/debug configuration settings.</p></li></ol><br><br><br><br>