Check the memory information, CAT/proc/meminfo. Similarly, check the CPU information. CAT/proc/cpuinfo sometimes has such questions. For example, if the 4-core CPU is a 2-core CPU * dual-core, or 1 CPU * quad core? There is a simple method: the number of processor, the number of cores, and the number of CPUs, depending on the physical ID + 1 of the last Processor
For example:
processor : 0vendor_id : GenuineIntelcpu family : 6model : 23model name : Pentium(R) Dual
start-all.sh Start principle
step1:start-all.sh
First look at the start-all.sh script in the Sbin directory.
Throw comments with little content:
# Start all Hadoop daemons. Run this on master node.
This script is not recommended for use in hadoop-2.6.0. The recommended use is to start start-dfs.sh and start-yarn.sh separately.
Its content steps:
1. Locate the path to the Bin folder and set Hadoop_libexec_dir this environment variable.
2. Execute the hadoop-config.sh script for Hadoop_libexec_d
calculate the second now (T2)
-Next. Therefore, clock_gettime and clock_nanosleep are two key APIs to port javasictest to other operating systems. It depends on whether the corresponding APIs can be called in other operating systems. Let's take a look at the implementation of clock_gettime in the Linux kernel. For details, refer to clock_gettime.c: If clock_realtime is used, it puts the gettimeofday call time into the struct timeval variable and converts it to struct.
Timespec type (the timeval
plugin maker, connect to cluster video, and hadoop-eclipse-plugin-2.5.0 plugin downloadII. Deployment Documentationbuild hadoop2.6.0 ha and yarn haHadoop 2.6.0 Single-node-pseudo-distributed mode installationthird, Apache Hadoop 2.6.0 new featuresApache Hadoop 2.6.0 released, the new stable version, the release frequency and quality is getting higher, and added a lot of things, from the size of the installation package can be seen, directly increased
Apache HadoopApache version derived faster, I will introduce you to the processThe Apachehadoop version is divided into two generations, we call the first generation Hadoop 1.0, and the second generation Hadoop called Hadoop 2.0. The first generation of Hadoop consists of three large versions, 0.20.x,0.21.x and 0.22.x, of which 0.20.x finally evolved into 1.0.x and became a stable version, while 0.21.x and 0.22.x Namenode new major features such as Ha. The second generation of Hadoop consists of
. When you actually develop your application, consider adding the following code to your program to automatically delete the output directory each time you run it, avoiding tedious command-line operations:
(JAVA)Configuration conf = new Configuration();Job job = new Job(conf);
/* 删除输出目录 */Path outputPath = new Path(args[1]);outputPath.getFileSystem(conf).delete(outputPath, true);To turn off Hadoop, run the
./sbin/stop-dfs.sh
AttentionThe next time you start
The original installation is three nodes, today to install a single node, after the completion of MapReduce is always unable to submit to YARN, tossing an afternoon did not fix
MR1 Job submitted to Jobtracker, in YARN should be submitted to ResourceManager, but found a localjob, found to do the following configuration does not take effect
In fact, in YARN does
There are many types of Linux clocks, roughly divided into two categories: periodic clocks that provide interrupts (RTC, Pit, and so on) that provide a count of incremental clocks (such as TSC)Here is a brief list of several common.(1) RTC(2) TSC(3) Kvm_clock(4) ACPI_PMView current system-supported clocksCat/sys/devices/system/clocksource/clocksource0/available_clocksourceView the currently used clockCat/sy
.
yum install cloudera-manager-server
Yum install cloudera-manager-server
Check what these two packages are installed. You can see that the server basically copies some configuration files. the real website management is installed through daemons. The specific files are under the/usr/share/cmf directory, and the logs are under the/var/log/cloudera-scm-server Directory, the runtime configuration file is in/var/run/cloudera-scm-server
[root@bogon ~]# rpm -ql cloudera-manager-server
to determine whether the configuration is successful.Java-version
2.4.4 install the remaining MachineGo through the above process.
2.5 service port conventions:Port Function9000 fs. defaultFS, such as: hdfs: // 172.25.40.171: 90009001 dfs. namenode. rpc-address, DataNode will connect to this port50070 dfs. namenode. http-address50470 dfs. namenode. https-address50100 dfs. namenode. backup. address50105 dfs. namenode. backup. http-address50090 dfs. namenode. secondary. http-address, for example,
/* * Initialize theStackprotector Canary value. * * Note:this must only be called fromFunctions thatNeverreturn, * and itMust always be inlined. */static __always_inline void boot_init_stack_canary (void) {U64 canary; U64 TSC;#ifdef config_x86_64BUILD_BUG_ON (Offsetof (Union irq_stack_union, stack_canary)! = +);#endif/* * We both use theRandom Pool and theCurrent TSC asA source * ofRandomness. The
NPM rebuild Node-sass (reference: http://www.cnblogs.com/niepeishen/p/5762162.html)
4 Compile typescript with Gulp
Here we need to use the Gulp-typescript plug-in, the definition gulpfile.js roughly as follows:
var gulp = require (' gulp ');
var ts = require (' Gulp-typescript ');
Gulp.task (' TSC ', function () {
gulp.src (' app/**/*.ts ')
. PIPE (TS ())
. Pipe (Gulp.dest (' Wwwroot/app '));
In order to achieve the function of
Pure Cloud Platform Management Learning rookie notes, referring to many of Daniel's blog, if there is infringement, please contact, delete immediately.Abstract1) Tight coupling of a specific programming model with the Re-source management infrastructure, forcing developers to Abu SE the MapReduce programming model, and 2) centralized handling of jobs ' control flow, which resulted in endless Scalabili Ty concerns for the scheduler.Personal Understanding: The Hadoop resource management scheduling
Spark supports yarn as a resource scheduler, so the principle of yarn should still be known: http://www.socc2013.org/home/program/a5-vavilapalli.pdf But overall, this is a general paper, Its principles are not particularly prominent, and the data it enumerates are not comparable, and there is almost no advantage in yarn. Anyway, the way I read it is that yarn's r
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