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Components of Hadoop Distributed file System (HDFS)

2/18/2018

HDFS is a spread across multiple machines (Simple with commodity Hardware)
Nothing unique about individual machine but unique part is a cluster as a whole is highly fault tolerant
Well Suited for large Batch Jobs
Not a low latency system
Data is HDFS is very very large (Semi-Structured)
Any data in HDFS in split across multiple disks where each disk in present on a diff machine in a cluster
File system manage machine and space
Setup by Master-Salve Nodes
Master Node (Name Node) coordinates with Slave Nodes(Data Node)
One Namenode/Cluster
For Example - Name note is like a table of content of a book and data node are the actual chapters
NameNode has 2 responsibilities
- Manage the overall file system
- Stores (Directory Structure)
- Other File metadata
DataNode
- Physically stores the data

Common SQL Functions

7/26/2015

Core aggregate functions like SUM, COUNT, MAX, MIN
Ranking functions like ROWNUM, RANK, NTILE
String functions like SUBSTR, REPLACE,INSTR
Data conversion functions like CAST, CONVERT

Useful SQL Queries

3/27/2015

Find Current database location
SELECT name, physical_name AS current_file_location
FROM sys.master_files

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Components of Hadoop Distributed file System (HDFS)

Common SQL Functions

Useful SQL Queries

Mac Forensics
Windows Forensics
Forensic Tools

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Blog

Components of Hadoop Distributed file System (HDFS)

Common SQL Functions

Useful SQL Queries

Mac ForensicsWindows ForensicsForensic Tools

Categories

Archives

Mac Forensics
Windows Forensics
Forensic Tools