ElasticSearch优化

迈不过友情╰ 2021-10-19 18:38 306阅读 0赞

$ curl -XPOST 'http://localhost:9200/twitter/_optimize'

# 管理索引优化 #

optimize API允许通过API优化一个或多个索引。优化过程的操作基本上优化的索引搜索速度更快（和涉及到Lucene索引内保存每个碎片的段数）。优化操作允许减少的段数，把它们合并。

$ curl -XPOST 'http://localhost:9200/twitter/_optimize'

<table style="border-collapse:collapse; border-spacing:0px; max-width:100%; background-color:transparent; width:671px; margin-bottom:1em; line-height:1em; color:rgb(133,140,137); font-family:Gibson-Regular,Arial; font-size:18px"> 
 <tbody style="vertical-align:top"> 
 <tr style=""> 
 <th style="padding:0.5em 0px; line-height:20px; vertical-align:top; border-top-style:none; color:rgb(69,71,70); border-bottom-width:2px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228); font-family:Gibson-SemiBold"> 名称</th> 
 <th style="padding:0.5em 0px; line-height:20px; vertical-align:top; border-top-style:none; color:rgb(69,71,70); border-bottom-width:2px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228); font-family:Gibson-SemiBold"> 描述</th> 
 </tr> 
 <tr style=""> 
 <td style="padding:0.75em 0px; line-height:1.25em; vertical-align:top; border-top-width:1px; border-top-style:solid; border-top-color:rgb(221,221,221); color:rgb(119,119,119); border-bottom-width:1px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228)"> max_num_segments</td> 
 <td style="padding:0.75em 0px; line-height:1.25em; vertical-align:top; border-top-width:1px; border-top-style:solid; border-top-color:rgb(221,221,221); color:rgb(119,119,119); border-bottom-width:1px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228)"> 段数优化。要全面优化索引，将其设置为<code style="font-family:monospace,serif; font-size:1em; padding:0px 5px; background-color:rgb(240,240,240); display:inline-block; vertical-align:baseline; zoom:1; line-height:19px">1</code>。默认设置只需检查是否需要执行一个合并，如果是这样，执行它 。【经过测试越小速度越快】 </td> 
 </tr> 
 <tr style=""> 
 <td style="padding:0.75em 0px; line-height:1.25em; vertical-align:top; border-top-width:1px; border-top-style:solid; border-top-color:rgb(221,221,221); color:rgb(119,119,119); border-bottom-width:1px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228)"> only_expunge_deletes</td> 
 <td style="padding:0.75em 0px; line-height:1.25em; vertical-align:top; border-top-width:1px; border-top-style:solid; border-top-color:rgb(221,221,221); color:rgb(119,119,119); border-bottom-width:1px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228)"> 优化过程中应该只抹去段删除。在Lucene中，不会被删除的文件从段，只是标记为删除。分部在合并过程中，创建一个新的分部，没有那些删除。此标志只允许合并段删除。默认为<code style="font-family:monospace,serif; font-size:1em; padding:0px 5px; background-color:rgb(240,240,240); display:inline-block; vertical-align:baseline; zoom:1; line-height:19px">false</code>。【设置为true docs才会合并】</td> 
 </tr> 
 <tr style=""> 
 <td style="padding:0.75em 0px; line-height:1.25em; vertical-align:top; border-top-width:1px; border-top-style:solid; border-top-color:rgb(221,221,221); color:rgb(119,119,119); border-bottom-width:1px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228)"> refresh</td> 
 <td style="padding:0.75em 0px; line-height:1.25em; vertical-align:top; border-top-width:1px; border-top-style:solid; border-top-color:rgb(221,221,221); color:rgb(119,119,119); border-bottom-width:1px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228)"> 如果刷新后进行优化。默认为<code style="font-family:monospace,serif; font-size:1em; padding:0px 5px; background-color:rgb(240,240,240); display:inline-block; vertical-align:baseline; zoom:1; line-height:19px">true</code>。</td> 
 </tr> 
 <tr style=""> 
 <td style="padding:0.75em 0px; line-height:1.25em; vertical-align:top; border-top-width:1px; border-top-style:solid; border-top-color:rgb(221,221,221); color:rgb(119,119,119); border-bottom-width:1px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228)"> flush</td> 
 <td style="padding:0.75em 0px; line-height:1.25em; vertical-align:top; border-top-width:1px; border-top-style:solid; border-top-color:rgb(221,221,221); color:rgb(119,119,119); border-bottom-width:1px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228)"> 如果冲洗后进行优化。默认为<code style="font-family:monospace,serif; font-size:1em; padding:0px 5px; background-color:rgb(240,240,240); display:inline-block; vertical-align:baseline; zoom:1; line-height:19px">true</code>。</td> 
 </tr> 
 <tr style=""> 
 <td style="padding:0.75em 0px; line-height:1.25em; vertical-align:top; border-top-width:1px; border-top-style:solid; border-top-color:rgb(221,221,221); color:rgb(119,119,119); border-bottom-width:1px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228)"> wait_for_merge</td> 
 <td style="padding:0.75em 0px; line-height:1.25em; vertical-align:top; border-top-width:1px; border-top-style:solid; border-top-color:rgb(221,221,221); color:rgb(119,119,119); border-bottom-width:1px; border-bottom-style:solid; border-bottom-color:rgb(229,234,228)"> 申请应等待合并结束。默认为<code style="font-family:monospace,serif; font-size:1em; padding:0px 5px; background-color:rgb(240,240,240); display:inline-block; vertical-align:baseline; zoom:1; line-height:19px">true</code>。注意，合并有可能是一个非常繁重的操作，所以它可能是有意义运行它设置为<code style="font-family:monospace,serif; font-size:1em; padding:0px 5px; background-color:rgb(240,240,240); display:inline-block; vertical-align:baseline; zoom:1; line-height:19px">假</code>。【最好设置为false,默认true请求就会阻塞在那里,直到完成】 </td> 
 </tr> 
 </tbody> 
</table>

优化API一个调用，可以应用到多个索引，或者所有索引

$ curl -XPOST 'http://localhost:9200/kimchy,elasticsearch/_optimize'
    
    $ curl -XPOST 'http://localhost:9200/_optimize'

参数使用方法： http://localhost:9200/indexName/\_optimize?only\_expunge\_deletes=true&wait\_for\_merge=false

译自：[http://www.elasticsearch.org/guide/reference/api/admin-indices-optimize/][http_www.elasticsearch.org_guide_reference_api_admin-indices-optimize]

[http_www.elasticsearch.org_guide_reference_api_admin-indices-optimize]: http://www.elasticsearch.org/guide/reference/api/admin-indices-optimize/