presto小记

【1】presto_cli安装和启动

假如创建/root/presto_client目录，作为presto_client的根目录。
下载jdk至此目录。
下载 presto-cli-0.100-executable.jar至此目录。
相关依赖结构如下：

5.编写命令启动脚本presto_cli，相关截图如下：

6.在shell 脚本下运行： presto_cli schemaName 即可登录成功相关catalog为hive,schema为schemaName

【2】presto Statement Resource

presto查询是向cordination节点post一个查询的请求，并分析response内容，如果含有nextUri，则查询还未完成，继续调用nextUri,直至response中不含有nextUri，则查询结束。

（1） function:: POST /v1/statement --提交查询请求

可以提交一个statment至此url执行presto查询，其消息头说明如下：

 function:: POST /v1/statement

   :query query: SQL Query to execute
   :reqheader X-Presto-User: User to execute statement on behalf of (optional)
   :reqheader X-Presto-Source: Source of query
   :reqheader X-Presto-Catalog: Catalog to execute query against
   :reqheader X-Presto-Schema: Schema to execute query against

（2）function:: GET /v1/statement/{queryId}/{token} --继续查询直至查询完成

:query queryId: The query identifier returned from the initial POST to /v1/statement

:query token: The token returned from the initial POST to /v1/statement or from a previous call to this same call

提交至（1）中的请求的response中含有nextUri属性，客户端可通过这个nextUri连接继续获取查询的进度或者最后的结果，当resoponse中不存在nextUri时，则认为此查询已完成，可通过response中data属性获取结果。

（3）function:: DELETE /v1/statement/{queryId}/{token} --删除此查询

   :query queryId: The query identifier returned from the initial POST to /v1/statement
   :reqheader X-Presto-User: User to execute statement on behalf of (optional)
   :reqheader X-Presto-Source: Source of query
   :reqheader X-Presto-Catalog: Catalog to execute query against
   :reqheader X-Presto-Schema: Schema to execute query against

关于此方面更具体信息，可参照链接，

https://github.com/prestodb/presto/blob/master/presto-docs/src/main/sphinx/rest/statement.rst

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