Linux

HDFS calculates the checksum (checksum), And when reading dataVerify the checksum. Calculate the checksum for the number of specified bytes. The default number of bytes is 512 bytes.Io. bytes. per. checksum attribute settings. 4 bytes after CRC-32

Many important servers use RAID arrays to improve the redundancy of hardware and protect the absolute security of data, especially the wider use of databases. However, sometimes some disks in the disk array group may be dropped due to some reasons,

Company cluster, configured Hadoop. Run the job and want to check the running status, but do not know the ip address of the jobtracker machine: Query the ip address of the hadoop jobtrack machine and view the file conf/mapred-site.xml mapred. job.

I have always heard that Docker is a great new thing, but I am not very interested until I encounter a real problem:If Docker is used for deploymentScout,Is it easier to do this? I will explain it in three parts.Wow, an effective way to simulate the

Environment: CentOS X64 6.4 Nginx 1.5.6 Python 2.7.5 Body:I. Install the required class library and Python2.7.5 Install necessary Development Kits yum groupinstall "Development tools"yum install zlib-devel bzip2-devel pcre-devel openssl-devel

Rsync Introduction 1. What is rsync? Rsync is an excellent open-source, fast, and multi-function tool that can synchronize and back up incremental local or remote data images. Applicable to multiple platforms. The software name indicates remote sync

Vsftpd (Secure File Transfer Protocol Daemon) is a secure and fast FTP server in Unix/Linux systems. In this tutorial, let's take a look at how to use vsftpd to configure a basic FTP server in openSUSE 13.1. Install vsftpd Log on as the root user

I. Environment DescriptionVmware workstation 10 virtualizes three centos 6.4-x64 instances. In host A's network environment, only the ip address of host configuration is 172.16.10.2/16;Host B simulates the enterprise gateway and has two ip addresses,

1. Check whether the nfs software is installed and started in CentOS 6.4.[Root @ localhost ~] # Rpm-aq | egrep 'nfs | rpcbind'Rpcbind-0.2.0-11.el6.i686Nfs-utils-1.2.3-36.el6.i686Nfs-utils-lib-1.1.5-6.el6.i686[Root @ localhost ~] #/Etc/init.

An error is reported when nginx is compiled for an internal testing machine./configure../Configure \-- Prefix =/usr/local/nginx \ specifies the installation location-- With-http_flv_module \ supports drag playback of FLV (flash) files--

Environment] Server: 10.1.10.86 Client: 10.1.1.160 .........   1. Install NFS NFS Server installation and configuration: (IN CentOS6.3, The portmap service is responsible for rpcbind) [Root @ NFS ~] # Yum-y install nfs-utils rpcbind   NFS Client

Today, we attempted to integrate HBase with Hadoop. My environment is hadoop2.2.0 + hbase-0.96.1.1-hadoop2, both in pseudo distribution mode. The system is CentOS 6.4 and 64-bit. hadoop pseudo-distributed installation and startup have been installed.

This article is a reference to the depth of the HDFS distributed file system. 1. Now let's take a look at the CentOS5.6 (32) setting process. 1. First, set the NIC of the VM to host-only.Set the IP address of VMnet1 to 192.168.1.1 for the virtual

1: Shuffle Error: Exceeded MAX_FAILED_UNIQUE_FETCHES; bailing-out Answer:In the program, you need to open multiple files for analysis. The default number of files in the system is 1024. (You can see it using ulimit-a.) It is enough for normal use,

I am very interested in Hadoop recently. The following is a compilation on the CentOS system. The system conditions are as follows: 1. CentOS 6.2 64-bit2. hadoop-2.2.03. jdk 1.6.0 _ 314. maven 3.1.05. protobuf-2.5.06. cmake 2.8.12.1 JDK has been

The report says that the Write Performance of the moosefs group has dropped from 10 MB/sec to 3 MB/sec. (Read performance: 10 MB/sec unchanged) Check. Set the default one in MFSMASTER. CFG:CHUNKS_WRITE_REP_LIMIT = 1CHUNKS_READ_REP_LIMIT = 5

Install a single Hadoop node to facilitate learning and debugging. 0. Install jdk, which can be easily found in Benbo. (I used root to play the game directly. You can do this either) Enter sudo-s. in the terminal window, enter the login password of

Test Environment Topology LVS + Keepalived frontend SchedulingMasterSystem Version: CentOS release 5.9 (Final)Kernel version: 2.6.18-348.3.1.el5Install configurations1. Install the ipvsadm component# Yum install-y ipvsadm2. Install the compiling

Finally, ganglia was installed on CentOS6.4. It was very difficult to install the application on linux, and it was a good luck. If you found a good installation instruction document, it will be completed soon, or it will be a long and painful

Apache proxy is divided into forward proxy and reverse proxy 1. Forward Proxy: the client cannot directly access the external web. You must set up a proxy server in the network where the client is located, the client accesses the external web