缘起
最近某个5节点es集群发现其中1个主节点（被选中master）cpu负载很高，其中3节点master角色，所有节点默认data角色，初步操作重启这个主节点，使其角色变更减少压力，发现不起作用。
后来使用Cerebro分析发现其中有个geo_infomation信息索引只有一个分片，且大小超过20G，默认单分片在SSD盘中大小最好不超过20G，HDD盘中大小最好不超过10G时性能最佳，这里分片不均衡导致集群压力分配不均。
所以现在需要改变geo_information的索引分片信息，由于不可变更已经生成索引的分片信息，所以只能新建一个索引（默认5分片），然后迁移索引mapping和data数据，这里使用elasticsearch-dump实现。
[root@VM-88-87-centos bin]# curl 192.168.88.87:9200/_cat/nodes
192.168.88.39 27 88 4 0.33 0.30 0.26 dim - es-39
192.168.88.135 72 99 99 18.33 18.52 18.45 di - es-135
192.168.88.40 32 99 98 21.67 21.03 20.73 dim - es-40
192.168.88.33 49 94 3 0.41 0.34 0.27 dim * es-33
192.168.88.87 35 95 0 0.01 0.04 0.08 di - es-87操作步骤
1、安装node环境
[root@VM-88-87-centos ~]# wget https://cdn.npm.taobao.org/dist/node/v14.12.0/node-v14.12.0-linux-x64.tar.xz
[root@VM-88-87-centos ~]# xz -d node-v14.12.0-linux-x64.tar.xz
[root@VM-88-87-centos ~]# tar -xvf node-v14.12.0-linux-x64.tar -C /usr/local/
[root@VM-88-87-centos ~]# cd /usr/local/
[root@VM-88-87-centos local]# ln -s node-v14.12.0-linux-x64 node
[root@VM-88-87-centos local]# vim /etc/profile
export JAVA_HOME=/usr/local/jdk
export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar
export NODE_HOME=/usr/local/node
export NODE_PATH=$NODE_HOME/lib/node_modules
export PATH=$PATH:${JAVA_HOME}/bin:$NODE_HOME/bin
[root@VM-88-87-centos local]# source /etc/profile
[root@VM-88-87-centos local]# node -v
v14.12.0
[root@VM-88-87-centos local]# npm -v
6.14.82、安装elasticsearch-dump
[root@VM-88-87-centos ~]# wget https://codeload.github.com/elasticsearch-dump/elasticsearch-dump/tar.gz/v6.33.4
[root@VM-88-87-centos ~]# tar zxvf v6.33.4
[root@VM-88-87-centos ~]# cd elasticsearch-dump-6.33.4/
[root@VM-88-87-centos elasticsearch-dump-6.33.4]# ls
bin Dockerfile LICENSE.txt test
docker-compose-test-helper.yml elasticdump.jpg node_modules transforms
docker-compose.yml elasticdump.js package.json
docker-entrypoint.sh lib README.md
[root@VM-88-87-centos elasticsearch-dump-6.33.4]# cd bin/依次安装依赖
p-queue delay ini s3urls lodash requestretry request lossless-json big.js aws4 aws-sdk async socks5-http-client socks5-https-client bytes JSONStream s3-stream-upload http-status
[root@VM-88-87-centos bin]# ./elasticdump --input=http://192.168.88.87:9200/geo_information --output=http://192.168.88.87:9200/geo_information_new --type=mapping
internal/modules/cjs/loader.js:896
throw err;
^
Error: Cannot find module 'p-queue'
Require stack:
- /root/elasticsearch-dump-6.33.4/lib/processor.js
- /root/elasticsearch-dump-6.33.4/elasticdump.js
- /root/elasticsearch-dump-6.33.4/bin/elasticdump
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:893:15)
at Function.Module._load (internal/modules/cjs/loader.js:743:27)
at Module.require (internal/modules/cjs/loader.js:965:19)
at require (internal/modules/cjs/helpers.js:88:18)
at Object. (/root/elasticsearch-dump-6.33.4/lib/processor.js:2:29)
at Module._compile (internal/modules/cjs/loader.js:1076:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1097:10)
at Module.load (internal/modules/cjs/loader.js:941:32)
at Function.Module._load (internal/modules/cjs/loader.js:782:14)
at Module.require (internal/modules/cjs/loader.js:965:19) {
code: 'MODULE_NOT_FOUND',
requireStack: [
'/root/elasticsearch-dump-6.33.4/lib/processor.js',
'/root/elasticsearch-dump-6.33.4/elasticdump.js',
'/root/elasticsearch-dump-6.33.4/bin/elasticdump'
]
}
[root@VM-88-87-centos bin]# npm install p-queue
npm notice created a lockfile as package-lock.json. You should commit this file.
+ [email protected]
added 4 packages from 2 contributors and audited 5 packages in 5.154s
1 package is looking for funding
run `npm fund` for details
found 0 vulnerabilities 最终npm模块依赖如下
[root@VM-88-87-centos bin]# npm list
[email protected] /root/elasticsearch-dump-6.33.4
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3、数据迁移
由于setting里面的index分片信息是不同的，所以新index默认创建即可，不需要迁移setting配置
mapping迁移
[root@VM-88-87-centos bin]# ./elasticdump --input=http://192.168.88.87:9200/geo_information --output=http://192.168.88.87:9200/geo_information_new --type=mapping
Sun, 27 Sep 2020 02:45:24 GMT | starting dump
Sun, 27 Sep 2020 02:45:24 GMT | got 1 objects from source elasticsearch (offset: 0)
Sun, 27 Sep 2020 02:45:25 GMT | sent 1 objects to destination elasticsearch, wrote 1
Sun, 27 Sep 2020 02:45:25 GMT | got 0 objects from source elasticsearch (offset: 1)
Sun, 27 Sep 2020 02:45:25 GMT | Total Writes: 1
Sun, 27 Sep 2020 02:45:25 GMT | dump completedata迁移
20G数据大概用了1小时
[root@VM-88-87-centos bin]# ./elasticdump --input=http://192.168.88.87:9200/geo_information --output=http://192.168.88.87:9200/geo_information_new --limit 10000 --type=data
Sun, 27 Sep 2020 06:19:22 GMT | starting dump
Sun, 27 Sep 2020 06:19:22 GMT | got 10000 objects from source elasticsearch (offset: 0)
Sun, 27 Sep 2020 06:19:24 GMT | sent 10000 objects to destination elasticsearch, wrote 10000
Sun, 27 Sep 2020 06:19:25 GMT | got 10000 objects from source elasticsearch (offset: 10000)
Sun, 27 Sep 2020 06:19:26 GMT | sent 10000 objects to destination elasticsearch, wrote 10000
Sun, 27 Sep 2020 06:19:27 GMT | got 10000 objects from source elasticsearch (offset: 20000)
Sun, 27 Sep 2020 06:19:28 GMT | sent 10000 objects to destination elasticsearch, wrote 10000
Sun, 27 Sep 2020 06:19:28 GMT | got 10000 objects from source elasticsearch (offset: 30000)
Sun, 27 Sep 2020 06:19:30 GMT | sent 10000 objects to destination elasticsearch, wrote 10000
Sun, 27 Sep 2020 06:19:30 GMT | got 10000 objects from source elasticsearch (offset: 40000)
Sun, 27 Sep 2020 06:19:32 GMT | sent 10000 objects to destination elasticsearch, wrote 10000
Sun, 27 Sep 2020 06:19:32 GMT | got 10000 objects from source elasticsearch (offset: 50000)
Sun, 27 Sep 2020 06:19:33 GMT | sent 10000 objects to destination elasticsearch, wrote 10000
Sun, 27 Sep 2020 06:19:34 GMT | got 10000 objects from source elasticsearch (offset: 60000)
Sun, 27 Sep 2020 06:19:35 GMT | sent 10000 objects to destination elasticsearch, wrote 10000
Sun, 27 Sep 2020 06:19:36 GMT | got 10000 objects from source elasticsearch (offset: 70000)
Sun, 27 Sep 2020 06:19:37 GMT | sent 10000 objects to destination elasticsearch, wrote 10000
Sun, 27 Sep 2020 06:19:38 GMT | got 10000 objects from source elasticsearch (offset: 80000)
Sun, 27 Sep 2020 06:19:39 GMT | sent 10000 objects to destination elasticsearch, wrote 10000
.....
Sun, 27 Sep 2020 07:21:47 GMT | sent 10000 objects to destination elasticsearch, wrote 10000
Sun, 27 Sep 2020 07:21:48 GMT | got 10000 objects from source elasticsearch (offset: 19980000)
Sun, 27 Sep 2020 07:21:49 GMT | sent 10000 objects to destination elasticsearch, wrote 10000
Sun, 27 Sep 2020 07:21:50 GMT | got 6094 objects from source elasticsearch (offset: 19990000)
Sun, 27 Sep 2020 07:21:50 GMT | sent 6094 objects to destination elasticsearch, wrote 6094
Sun, 27 Sep 2020 07:21:50 GMT | got 0 objects from source elasticsearch (offset: 19996094)
Sun, 27 Sep 2020 07:21:50 GMT | Total Writes: 19996094
Sun, 27 Sep 2020 07:21:50 GMT | dump complete后续
es虽然支持横向扩容缩容及配置纵向扩减配，但是有些信息还是需要开始设计时安排合理，比如mapping、index分片、主节点信息、冷热、集群规模等。否则后续变更起来很麻烦。