# hbase-2.3.2-src

**Repository Path**: w749/hbase-2.3.2-src

## Basic Information

- **Project Name**: hbase-2.3.2-src
- **Description**: hbase-2.3.2源码，本地调试和源码阅读
- **Primary Language**: Java
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2022-02-25
- **Last Updated**: 2022-06-06

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

Apache HBase [1] is an open-source, distributed, versioned, column-oriented
store modeled after Google' Bigtable: A Distributed Storage System for
Structured Data by Chang et al.[2]  Just as Bigtable leverages the distributed
data storage provided by the Google File System, HBase provides Bigtable-like
capabilities on top of Apache Hadoop [3].

To get started using HBase, the full documentation for this release can be
found under the doc/ directory that accompanies this README.  Using a browser,
open the docs/index.html to view the project home page (or browse to [1]).
The hbase 'book' at http://hbase.apache.org/book.html has a 'quick start'
section and is where you should being your exploration of the hbase project.

The latest HBase can be downloaded from an Apache Mirror [4].

The source code can be found at [5]

The HBase issue tracker is at [6]

Apache HBase is made available under the Apache License, version 2.0 [7]

The HBase mailing lists and archives are listed here [8].

The HBase distribution includes cryptographic software. See the export control
notice here [9].

1. http://hbase.apache.org
2. http://research.google.com/archive/bigtable.html
3. http://hadoop.apache.org
4. http://www.apache.org/dyn/closer.cgi/hbase/
5. https://hbase.apache.org/source-repository.html
6. https://hbase.apache.org/issue-tracking.html
7. http://hbase.apache.org/license.html
8. http://hbase.apache.org/mail-lists.html
9. https://hbase.apache.org/export_control.html

## 源码阅读

### 本地环境准备

本地调试之前需要先在Project Structure把Java环境配置好，然后直接打包源码`mvn clean install -DskipTests`，我用的这个版本在最后几个模块打包的时候会报错，不过不影响HMaster这些组件的启动和本地调试，不用理会。

打包完成后是Configurations环境的设置，需要分别设置HMaster启动环境和Shell环境，截图在flowchart文件夹。

接下来还需要把conf文件夹复制到hbase-server/src/main文件夹中，并且简单的配置一下hbase-site.xml文件，然后需要把hbase-server目录下的pom.xml`<scope>test</scope>`全部替换为`<scope>compile</scope>`。最后就可以选择HMaster启动调试了。

### 源码阅读过程

分别看了HMaster的启动流程、HRegionServer的启动流程和Put流程，流程图也在flowchart文件夹中

HMaster和HRegionServer的启动直接从它们各自类的main方法进去，Put则是从HTable的put方法开始，也就是客户端提交Put的入口，源码中的涉及到的关键步骤已经做了标记，使用的是自定义的TODO_MY

有些操作还不是很理解，还有Get的流程本来也是要看的，但最后实在找不到怎么从内存和HFile中取出Cell的，暂时放弃了