ElasticSearch备份快照到HDFS-2.6(CDH5.6.0)

repository-hdfs安装包的下载地址: https://oss.sonatype.org/content/repositories/snapshots/org/elasticsearch/elasticsearch-repository-hdfs/

背景说明

由于业务需要将ES-2.2.1版本升级到ES-2.3.2版本，需要将index迁移过去，查了很多资料，最后决定用es的快照/恢复模块来实现索引迁移。
在这里我采用CDH5.6.0的HDFS作为快照的存储文件系统，在ES中安装repository-hdfs这个插件
hdfs的路径为：hdfs://192.168.10.236:8020

在线安装踩过的坑（失败）

1. 按照repository-hdfs插件地址的说明，可以用bin/plugin install elasticsearch/elasticsearch-repository-hdfs/2.3.2在线安装，然而安装的时候一直报错，经过检查，是plugin-descriptor.properties里面的版本设置问题，ES-2.3.2版本却对应着2.3.1的安装包，最后执行bin/plugin install elasticsearch/elasticsearch-repository-hdfs/2.3.1安装成功

2. 于是按照repository-hdfs插件地址的说明

repositories  hdfs:    uri: "hdfs://<host>:<port>/"    # optional - Hadoop file-system URI    path: "some/path"               # required - path with the file-system where data is stored/loaded    load_defaults: "true"           # optional - whether to load the default Hadoop configuration (default) or not    conf_location: "extra-cfg.xml"  # optional - Hadoop configuration XML to be loaded (use commas for multi values)    conf.<key> : "<value>"          # optional - 'inlined' key=value added to the Hadoop configuration    concurrent_streams: 5           # optional - the number of concurrent streams (defaults to 5)    compress: "false"               # optional - whether to compress the metadata or not (default)    user: "foobar"                  # optional - user name for creating the file system. Typically used along-side the uri for `SIMPLE` authentication    ## Kerberos specific settings    user_keytab: "other/path"       # optional - user keytab    user_principal: "buckethead"    # optional - user's Kerberos principal name    user_principal_hostname: "gw"   # optional - hostname replacing the user's Kerberos principal $host

在elasticsearch.yml配置文件后加上，

repositories.hdfs:uri: "hdfs://192.168.10.236:8020"path: "/es"load_defaults: "true"concurrent_streams: 5conf_location: "core-site.xml,hdfs-site.xml"compress: "true"

把CDH5.6.0中的HDFS里的/etc/hadoop/conf/hdfs-site.xml和core-site.xml复制到ES每个节点的/elasticsearch-2.3.2/conf/下，并重启ES集群

3.创建repository,执行

```curl -XPUT '192.168.10.225:9201/_snapshot/backup?pretty' -d '{"type": "hdfs","settings": {"uri": "hdfs://192.168.10.236:8020","path": "/es","load_defaults": "true"}}'```

结果报了Server IPC version 9 cannot communicate with client version 4的错误，原因是在线安装的插件里的jar包版本太旧，在线安装宣告失败。

离线安装repository-hdfs插件（成功）

1. 在repository-hdfs插件仓库中下载对应版本的插件，我这里下载elasticsearch-repository-hdfs-2.3.2.BUILD-20160516.063716-13-hadoop2.zip

2. 将zip通过scp发送到每个es节点

scp download/elasticsearch-repository-hdfs-2.3.2.BUILD-20160516.063716-13-hadoop2.zip  qiaqia@192.168.10.225:/opt

3. 安装

bin/plugin install file:///opt/elasticsearch-repository-hdfs-2.3.2.BUILD-20160516.063716-13-hadoop2.zip 

3. 配置

在elasticsearch.yml配置文件后加上（必须，否则会有权限问题）

    # 禁用jsm,使快照能保存于hdfs    security.manager.enabled: false

至于下面的配置，可以加上，也可以通过restful api配置

repositories.hdfs:  uri: "hdfs://192.168.10.236:8020"  path: "/es"  load_defaults: "true"  concurrent_streams: 5  conf_location: "core-site.xml,hdfs-site.xml"  compress: "true"

重启每个节点

4. 新建repository （采用kopf插件）

5. 创建快照

6. 恢复快照