1. ?NameNode overview
a. NameNode is the core of HDFS.
b, NameNode is also called Master.
c. NameNode only stores HDFS metadata: the directory tree of all files in the file system
Tag: HDFS
Hadoop-HDFS-Storage Model – Architecture Model – Role Introduction
HDFS advantages and disadvantages
Brief description of HDFS architecture
1. Introduction to HDFS
HDFS (Hadoop distributed File System): Hadoop distributed file system. It is developed based on the needs of streaming dat
HDFS java API TROUBLESHOOTING
Official document:
https://hadoop.apache.org/docs/r2.9.2/hadoop-project-dist/hadoop-common/SingleCluster.html
Configuration free Password login for communication between nameNode and dataNode
Hadoop – How do I check if HDFS is running?
I want to see if Hadoop’s hdfs file system is working properly. I know that jps lists the running daemons, but I don’t actually know which daemons to look for. < p>
I ran the following comman
Ten, HDFS NameNode work mechanism
[TOC]
txid:< br>namenode gives a unique id for each operation event (addition, deletion, modification operation), called txid, which is generally incremented from 0. For each additional opera
Performance – How to get time costs from HDFS read data from HDFS from spark
Spark’s timeline contains:
>Scheduler delay
>Task deserialization time
>Random play time
>Performer calculation time
>Random play write time
>Result serialization time
>Result time
It
9, Hadoop-HDFS Overview
1. Background and definition of HDFS generation Background generation
As the amount of data becomes larger and larger, it is stored in a system If you don’t have all the data, you need to all