proc hadoop

1. # echo 1 >/proc/sys/kernel/sysrq2. # echo B >/proc/sysrq-trigger1./proc/sys/kernel/sysrq1 is written to the SysRq file in order to turn on the SysRq feature. According to Linux/documentations/sysrq.txt, SYSRQ represents the Magic System Request Key. When this feature is turned on, it will respond to any action you require as long as the kernel is not dead. How

Explain the code block object Proc in Ruby, and explain the ruby object proc. Proc object Proc is a block conversion object. There are four methods to create a Proc: Sample Code # Method 1 inc = Proc. new {| x + 1} inc. call (2) #

Pxe2 writes 'proc file system as a pseudo file system, which only exists in the memory without occupying the external storage space. It provides interfaces for accessing system kernel data in the form of a file system. Users and applications can obtain system information through proc ...... The proc file system is a pseudo-file system that only exists in the mem

Core dump and/proc debugging-orisun-blog Core dump and/proc debugging Core Dump Using core dump is post-event debugging (postmortem Debug ). First, set the core file size to 1024. Orisun @ zcypc :~ $ Ulimit-C 0 Orisun @ zcypc :~ $ Ulimit-C 1024 Note that this modification is only valid for the current Shell Root @ zcypc:/home/orisun # echo "/corefile/Core-% E-% P-% t">/

Proc is a process object which is obtained after the object processing of block and its context (local variable scope and stack frame). You can use proc like a nameless function, but it does not import the scope of local variables (you can use dynamic local variables as proc local variables). In the following example, the Var variable is called because the

Ulimit-n corresponding/etc/security/limits.conf file settingsProblem: Can ' t open so many files for Linux OPS students, I believe they have encountered this problem.Under Linux All resources are files, ordinary files are files, disk printers are files, sockets of course also files. The system is set to 1024 by default, but this number is not enough for servers, especially large concurrency, so we need to change the actual situation to a larger and more reasonable value.Modify methodTemporary so

Proc-fs programming and proc-fs Programming I. Introduction The Proc file system is a pseudo-File System (Virtual File System) on Linux. It stores a series of special files in the running status of the current kernel, you can use these files to view the system hardware and currently running processes, or even change the running status of the kernel by changing s

Compile the Proc program in Linux, and compile the Proc program in Linux. A simple Proc program needs to be written in linux. There is very little information, and a brief summary will be made after completion.References. 1. download the following installation package from the oracle websiteSelect 64-bit or 32-bit based on the OS version. Sqlplus is used for con

Error code: 1728 Cannot load from mysql. proc. The table is probably uploaded upted, 1728mysql. procError code: 1728 Cannot load from mysql. proc. The table is probably uploaded uptedHttp://bugs.mysql.com/bug.php? Id = 50183The reason is that mysql. proc causes 5.1 comment char (64)-> 5.5 comment textThe difference seen in the mysql.

11gR2 RAC exclusive mode replace votedisk encounters PROC-26, restore ocr encounters CRS-4000, PROT-35, proc-26crs-4000 Link: http://blog.itpub.net/23135684/viewspace-748816/ The storage data of the 11gR2 RAC system is completely lost. The software of all nodes is installed on the local disk, and the local disk retains the OCR backup, the following describes how to restore the normal operation of Clusterwar

Linux Kernel proc file system usage example, Linux kernel proc example /* * Kernel programming test code** Copyright (C) 2014 Sun Mingbao * Dual licensed under the MIT and/or GPL licenses.**/# Include # Include # Include # Include # Include # Include MODULE_AUTHOR ("Sun Mingbao MODULE_DESCRIPTION ("kernel programming test code ");MODULE_VERSION ("1.0 ");MODULE_LICENSE ("Dual MIT/GPL ");# Define MODULE_NAME

/Proc/ /Statm Contains all CPU activity information. All values in this file are accumulated from the start of the system to the current time. [Root @ localhost ~] # Cat/proc/self/statm654 57 44 0 0 334 0 Output descriptionCPU and CPU 0... The meaning of each parameter in each row (in the first behavior example) is:Parameter explanation/proc/ /Status Si

$ CAT/proc/ioports-0cf7: PCI bus :002017-001f: dma10020-0021: pic10040-0043: timer00050-0053: timer10060-0060: keyboard0064-0064: keyboard0070-0071: rtc00080-008f: DMA page Reg00a0-00a1: pic200c0-00df: dma200f0-00ff: FPU0170-0177:. 00170-0177: pata_amd01f0-01f7:. 001f0-01f7: pata_amd0376-0376:. 00376-0376: pata_amd03c0-03df: VGA +03f6-03f6:. 003f6-03f6: pata_amd03f8-03ff: Serial04d0-04d1: PNP0800-080f: pnp0a00-0a0f: pnp 00: 0b0a10-0a1f: pnp 00: 0b0cf8

All values in this file are accumulated from the system startup to the current time. This file only provides information about all CPU sets, and cannot output information about each CPU. [Root @ localhost ~] # Cat/proc/loadavg4.61 4.36 4.15 9/84 5662 The meaning of each value is:Parameter descriptionLavg_1 (4.61) 1-minute average loadLavg_5 (4.36) 5-minute average loadLavg_15 (4.15) 15-minute average loadNr_running (9) indicates the number of task

Install times wrong: Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.7:run (site) on project Hadoop-hdfs:an Ant B Uildexception has occured:input file/usr/local/hadoop-2.6.0-stable/hadoop-2.6.0-src/hadoop-hdfs-project/ Hadoop-hdfs/target/findbugsxml.xml

This article mainly explains the functions and differences of the three files in Linux/etc/fstab/etc/mtab/proc/mounts./etc/fstabOperations are aware of the files, if you want to set Mount disk and Dir to automatically load each time the boot, then the relevant information should be written to this file. This file is also read when the "mount-a" command is used to mount automatically. For example:LABEL=/HADOOP