es压测
    参考链接：
    https://blog.csdn.net/BearStarX/article/details/103038171
    https://blog.csdn.net/BearStarX/article/details/103047725
    https://esrally.readthedocs.io/en/stable/install.html
    https://cloud.tencent.com/developer/article/1595367

    集群主机配置:
    mem 1536G
    cpu 80c
    disk 12*1.8T ssd

    节点信息:共3台机器，每台上面4个实例
    10.118.25.27
    10.118.25.28
    10.118.25.38

    压测工具:esrally

    一. esrally环境准备：esrally我是单独部署在一台机器，和es集群分割开
    1.将es5.4.1按照生产环境配置部署ok
    2.部署esrally环境:
    0>
    yum install bzip2-devel bzip2
    1> 安装python3.5
    tar -zxf Python-3.5.7.tgz
    cd Python-3.5.7
    ./configure —prefix=/usr/local/python3.5
    make
    make install
    ln -s /usr/local/python3.5/bin/python3.5 /usr/bin/python3.5
    ln -s /usr/bin/python3.5 /usr/bin/python3
    python3 —version
    2> 安装pip3
    tar -zxf pip-9.0.3.tar.gz
    cd pip-9.0.3
    python3 setup.py install
    ln -s /usr/local/python3.5/bin/pip3 /usr/bin/pip3
    pip3 —version
    3> 设置py3独立环境(此步骤可有可无)
    pip3 install virtualenv
    ln -s /usr/local/python3.5/bin/virtualenv /usr/bin/virtualenv
    mkdir python3.5_virtualenv
    cd python3.5_virtualenv/
    virtualenv —python=python3 .
    source ./bin/activate
    4> 安装esrally
    pip3 install esrally
    5> 装git1.9+
    安装依赖
    yum install curl-devel expat-devel gettext-devel openssl-devel zlib-devel asciidoc
    yum install gcc perl-ExtUtils-MakeMaker
    卸载旧版本
    yum remove git
    安装新版本
    tar -xvf git-2.23.0.tar.xz
    cd git-2.23.0/
    make prefix=/usr/local/git all
    make prefix=/usr/local/git install
    echo “export PATH=$PATH:/usr/local/git/bin” >> /etc/profile
    source /etc/profile
    版本验证
    [root@localhost ~]# git —version
    git version 2.23.0
    6> 装jdk8

    二. 离线数据源准备:
    1、下载数据包allCountries.zip
    2、解压：allCountries.txt
    3、txt转json（脚本参考官网）
    python3 toJSON.py > documents.json
    4、创建index.json (数据相关的)
    5、创建track.json （定义要压哪些指标）delete-index,create-index,cluster-healt,bulk,force-merge,index-append,index-stats,default,query-match-all
    根据实际情况修改document-count、uncompressed-bytes值
    6、验证
    esrally list tracks —track-path=~/rally-tracks/tutorial

    三.压测5.4.1
    1.按照生产配置部署5.4.1集群OK
    2.开始压测
    esrally —track-path=~/rally-tracks/tutorial —offline —pipeline=benchmark-only —target-hosts=10.118.25.27:9200
    —report-file=/home/elastic/5.4.1_result.csv —report-format=csv

    四.压测7.6.0
    1.按照生产配置部署7.6.0集群OK
    2.开始压测
    esrally —client-options=”basic_auth_user:’elastic’,basic_auth_password:’Bdp1@elastic’” —track-path=~/rally-tracks/tutorial —offline
    —pipeline=benchmark-only —target-hosts=10.118.25.27:9200 —report-file=/home/elastic/7.6_result.csv —report-format=csv

    结果比较
    esrally list races
    esrally compare —baseline=xxxxx —contender=xxxx