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
Author: Simo
NHIBERNATE – Can’t find the field: ‘nancy.bootstrapper.nancybootstrapperlocator.bootstrapper’
I have been using Nancy fx recently and I like it, but when I try to make a structure diagram ioc like the documentation page suggests I get an error
Find Field not found:’Nancy.Bootstrapper.
Hadoop has one or more files per mapper?
Does the mapper process multiple files at the same time or the mapper can only process one file at a time? I want to know the default behavior >By default, a typical Mapreduce job follows one inp
Hadoop – What is the difference between FirstInfirstoutPrioritizer and OldestFlowFileFirstPrioritizer?
The user guide https://nifi.apache.org/docs/nifi-docs/html/user-guide.html has the following detailed information about the priority sorter, please help I understand these differences and provide a
Multi-INSERT Writing in Hive
Multiple inserts:
with tmp_a as (
select name from tmp_test3
)
from tmp_a
insert overwrite table tmp_test1
select name where name = ‘test123’
insert overwrite table tmp_test2
select na
What is the difference between Hadoop – AWS ELASTIC MAPREDUCE and AWS Redshift
I see that both AWS Elastic MapReduce and AWS Redshift use a cluster structure, which can be used for data analysis. What are their different use cases?
Amazon Redshift supports client connec
Hue installation and use
HUE is an open source Apache Hadoop UI system, which was developed by Cloudera in the early stage and later contributed to the open source community. It is implemented based on the Python Web frame
Hive data type
Basic type < p align="center">Type name
Size
Minimum value
Maximum value
Example
TINYINT
1byte
-128
127
100Y
SMALLINT
2byte
Despite the use of lazy fetch, Hibernate JPA OnToone is still inquiring
The problem I encountered is that Hibernate queries a class on the other side of the lazy onetoone relationship.
Query top_players (depending on cache settings) Query through the mapping tabl
Hadoop – How to extract the first tuple from the package generated in the PIG (whose size may be different)?
I’m generating a “package” information, its size (the number of tuples in the package) may be different. From here, I want to dynamically extract the first element. I should How to do it Accordi