亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱

Table of Contents
HDFS installation and configuration
Advanced configuration and optimization
Home Operation and Maintenance CentOS Tips for using HDFS file system on CentOS

Tips for using HDFS file system on CentOS

Apr 14, 2025 pm 07:30 PM
centos Browser red

Guide to Installation, Configuration and Optimization of HDFS File System under CentOS System

This article will guide you on how to install, configure, and optimize Hadoop Distributed File System (HDFS) on CentOS systems.

HDFS installation and configuration

  1. Java environment installation:

    First, make sure that the appropriate Java environment is installed. Edit the /etc/profile file, add the following, and replace /usr/lib/java-1.8.0/jdk1.8.0_144 with your actual Java installation path:

     export JAVA_HOME=/usr/lib/java-1.8.0/jdk1.8.0_144
    export PATH=$JAVA_HOME/bin:$PATH
    export CLASSPATH=$JAVA_HOME/jre/lib/ext:$JAVA_HOME/lib/tools.jar
    source /etc/profile
  2. Hadoop environment variable configuration:

    Edit /etc/profile file and add Hadoop environment variables. Please replace /opt/hadoop/hadoop-2.8.1 with your Hadoop installation path:

     export HADOOP_HOME=/opt/hadoop/hadoop-2.8.1
    export PATH=$HADOOP_HOME/bin:$PATH
    export CLASSPATH=$HADOOP_HOME/lib/*
    source /etc/profile
  3. SSH password-free login configuration:

    To facilitate communication between Hadoop nodes, configuring SSH password-free login is crucial. Execute the following command:

     ssh-keygen -t rsa
    ssh-copy-id localhost
  4. NameNode formatting:

    When configuring HDFS for the first time, the NameNode must be formatted:

     hdfs namenode -format
  5. HDFS startup:

    Start HDFS service:

     $HADOOP_HOME/sbin/start-dfs.sh
  6. HDFS web interface access:

    Access NameNode's web interface through a browser (replace<namenode-ip></namenode-ip> Replace with NameNode's IP address):

     <code>http://<namenode-ip> :50070</namenode-ip></code>

Advanced configuration and optimization

  1. HDFS High Availability (HA):

    Configuring high availability requires two NameNodes (one active and one passive) and at least three JournalNodes. Edit the hdfs-site.xml file and add the following configuration (replace with your actual node information):

    <property>
      <name>dfs.nameservices</name>
      <value>mycluster</value>
    </property>
    <property>
      <name>dfs.ha.namenodes.mycluster</name>
      <value>nn1,nn2</value>
    </property>
    <property>
      <name>dfs.namenode.rpc-address.mycluster.nn1</name>
      <value>namenode1:8020</value>
    </property>
    <property>
      <name>dfs.namenode.rpc-address.mycluster.nn2</name>
      <value>namenode2:8020</value>
    </property>
    <property>
      <name>dfs.namenode.http-address.mycluster.nn1</name>
      <value>namenode1:50070</value>
    </property>
    <property>
      <name>dfs.namenode.http-address.mycluster.nn2</name>
      <value>namenode2:50070</value>
    </property>
    <property>
      <name>dfs.namenode.shared.edits.dir</name>
      <value>qjournal://journalnode1:8485;journalnode2:8485;journalnode3:8485/mycluster</value>
    </property>
  2. Performance Tuning:

    • NameNode memory optimization: According to the Hadoop version, adjust hadoop-env.sh (Hadoop 2.x) or use the memory automatic allocation feature (Hadoop 3.x) to optimize NameNode memory. Use the jmap -heap command to monitor memory usage.
    • Heartbeat concurrency optimization: Edit hdfs-site.xml and increase the value of dfs.namenode.handler.count to improve concurrency processing capability.
    • Enable HDFS Recycle Bin: Modify fs.trash.interval and fs.trash.checkpoint.interval in core-site.xml to enable the Recycle Bin.
    • Multi-directory configuration: Modify dfs.namenode.name.dir and dfs.datanode.data.dir in hdfs-site.xml to configure multiple directories to improve data reliability and performance.

Through the above steps, you can effectively install, configure and optimize the HDFS file system on your CentOS system. Please remember to adjust the path and IP address according to your actual environment.

The above is the detailed content of Tips for using HDFS file system on CentOS. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How to check the main trends of beginners in the currency circle How to check the main trends of beginners in the currency circle Jul 31, 2025 pm 09:45 PM

Identifying the trend of the main capital can significantly improve the quality of investment decisions. Its core value lies in trend prediction, support/pressure position verification and sector rotation precursor; 1. Track the net inflow direction, trading ratio imbalance and market price order cluster through large-scale transaction data; 2. Use the on-chain giant whale address to analyze position changes, exchange inflows and position costs; 3. Capture derivative market signals such as futures open contracts, long-short position ratios and liquidated risk zones; in actual combat, trends are confirmed according to the four-step method: technical resonance, exchange flow, derivative indicators and market sentiment extreme value; the main force often adopts a three-step harvesting strategy: sweeping and manufacturing FOMO, KOL collaboratively shouting orders, and short-selling backhand shorting; novices should take risk aversion actions: when the main force's net outflow exceeds $15 million, reduce positions by 50%, and large-scale selling orders

Why does Binance account registration fail? Causes and solutions Why does Binance account registration fail? Causes and solutions Jul 31, 2025 pm 07:09 PM

The failure to register a Binance account is mainly caused by regional IP blockade, network abnormalities, KYC authentication failure, account duplication, device compatibility issues and system maintenance. 1. Use unrestricted regional nodes to ensure network stability; 2. Submit clear and complete certificate information and match nationality; 3. Register with unbound email address; 4. Clean the browser cache or replace the device; 5. Avoid maintenance periods and pay attention to the official announcement; 6. After registration, you can immediately enable 2FA, address whitelist and anti-phishing code, which can complete registration within 10 minutes and improve security by more than 90%, and finally build a compliance and security closed loop.

Binance Exchange official website entrance Binance Exchange official website entrance Jul 31, 2025 pm 06:21 PM

Binance Exchange is the world's leading cryptocurrency trading platform. The official website entrance is a designated link. Users need to access the website through the browser and pay attention to preventing phishing websites; 1. The main functions include spot trading, contract trading, financial products, Launchpad new currency issuance and NFT market; 2. To register an account, you need to fill in your email or mobile phone number and set a password. Security measures include enabling dual-factor authentication, binding your mobile email and withdrawal whitelist; 3. The APP can be downloaded through the official website or the app store. iOS users may need to switch regions or use TestFlight; 4. Customer support provides 24/7 multi-language services, and can obtain help through the help center, online chat or work order; 5. Notes include accessing only through official channels to prevent phishing

Bitcoin Real-time Market Trend Chart APP Latest BTC Price 24-hour K-line Online Analysis Bitcoin Real-time Market Trend Chart APP Latest BTC Price 24-hour K-line Online Analysis Jul 31, 2025 pm 10:24 PM

Bitcoin (BTC) is the world's first decentralized digital currency. Since its debut in 2009, it has become the leader in the digital asset market with its unique encryption technology and limited supply. For users who are following the cryptocurrency space, it is crucial to keep track of their price dynamics in real time.

BTC Coin Latest Price Trend Chart Real-time Software Bitcoin Today's Exchange Rate K-line Analysis BTC Coin Latest Price Trend Chart Real-time Software Bitcoin Today's Exchange Rate K-line Analysis Jul 31, 2025 pm 10:21 PM

Bitcoin (BTC) is the world's first decentralized digital currency, and it is also the pioneer and weather vane of the cryptocurrency market. Since its birth in 2009, its price volatility and technological innovation have attracted much attention from investors and technology enthusiasts around the world. Real-time grasp of its price trends is crucial for market participants.

Toncoin latest price trend app 24-hour TON coin k-line chart online analysis Toncoin latest price trend app 24-hour TON coin k-line chart online analysis Aug 01, 2025 pm 09:42 PM

Toncoin (TON) is a decentralized first-tier blockchain originally conceived by the Telegram team. It is known for its high performance, low cost and user-friendly features, and aims to provide an open network platform for billions of users around the world. Its native token TON is used in the network to pay transaction fees, pledge and participate in network governance.

Why is my keyboard not typing in any browser Why is my keyboard not typing in any browser Jul 31, 2025 am 08:16 AM

Ensureyou'reclickingintoaneditabletextfieldwithablinkingcursor;pressTabtonavigatetoinputareas.2.Testinanincognito/privatewindow;iftypingworks,disableextensionsonebyonetofindtheculpritordisableaccessibilityfeatureslikecaretbrowsing.3.PressF7todisablec

yandex web version entrance How to download Binance yandex safe download Binance yandex web version entrance How to download Binance yandex safe download Binance Aug 01, 2025 pm 06:27 PM

When using Yandex to find the official Binance channel, you must accurately locate the official website by searching for "Binance Official Website" or "Binance Official Website"; 2. After entering the official website, find the "Download" or "App" entrance in the header or footer, and follow the official guidelines to download or obtain the officially verified installation files through the app store; 3. Avoid clicking on advertisements or third-party links throughout the process, ensure that the domain name is correct and the link is trustworthy, so as to ensure the download security.

See all articles