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Author: Simo

First, MapReduce basic principle

1. Basic Overview of MapReduce 1. Definition It is a programming framework for distributed computing programs. The core function is to integrate the business logic code written by the user and the

October 12, 2021By Simo Hadoop basic principle, First, MapReduceLeave a Comment

CouchBase and CouchBase Lite differences? [Before it called TouchDB]

What is Couchbase and what is Couchbase Lite? Is there any difference between the two? How can I create couchbase lite on a mobile device and how can I communicate with the server? Did you happe

October 12, 2021By Simo Hadoop Couchbase, Difference, limitedLeave a Comment

Project instance and debugging operations started by Jetty Start

Start command:

java -jar %JETTY_HOME%/start.jar (in the base directory or home directory Execution)

Description: %JETTY_HOME% is an environment variable, the value is jetty home directo

October 12, 2021By Simo Jetty debugging, instance, jetty, operation, project, Start, startupLeave a Comment

Hibernate annotation development

We use annotations in hibernate, which can help us simplify hbm file configuration.
1.1. PO class annotation configuration
@Entity declares an entity br/>@Table to describe the class and table cor

October 12, 2021By Simo Hibernate annotation, Development, HibernateLeave a Comment

How to tell Hibernate Conditionally ignore the columns in Crud operations

Is it possible in some way to tell Hibernate to conditionally ignore missing columns in the database table when performing CRUD operations?

I have a Java application that uses Hibernate as th

October 12, 2021By Simo Hibernate condition, CRUD, Hibernate, how to tell, Ignore, land, operationLeave a Comment

The difference between Hadoop – Reduce Task and Reducer

“The reducer is different from the reduction task. The reducer can run multiple reduction tasks”. Can someone explain this with the following example?

foo.txt: Very good, this is the foo file

October 12, 2021By Simo Hadoop between, Hadoop, Reduce, REDUCER, TaskLeave a Comment

NHIBERNATE line number exceeds partition C #

I am new to nhibernate and need your help.

How to execute this sql query in nhibernate-criteria C#

select * from
(
select *, row_number() over (partition by questionaireId order by ste

October 12, 2021By Simo Hibernate C #, exceeding, line number, NHIBERNATE, partitionLeave a Comment

HBase table two data backup methods

Hbase table two data backup methods-import and export examples p> This article will provide two backup methods——

1) Back up a table in hbase based on the class provided by Hbase

2) Fast

October 12, 2021By Simo Hadoop Backup, data, HBase, method, table, twoLeave a Comment

Use the Hibernate Projections on Entity With Manytoone relationship, use fewer columns on SQL query

I am trying to build a smaller SQL to avoid the “select * from A” built for hibernate Criteria by default.

If I Using simple fields (no relation), through “Transformers”, I can manage to have

October 12, 2021By Simo Hibernate entity, Hibernate, less, Manytoone, More, Projections, query, relationship, SQL, Through, useLeave a Comment

When the component is removed, NHibernate is incorrectly compared to NULL.

I have a problem updating the collection of components on the entity. It was originally mapped as a package, but this resulted in deleting and reinserting all entries every time. Change it to a gro

October 12, 2021By Simo Hibernate comparison, Component, delete, error, land, NHIBERNATE, null, procedure, timeLeave a Comment

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