1 compress & mr hive默认的execution engine是mr hive> set hive.execution.engine;hive.execution.engine=mr 所以针对mr的优化就是hive的优化,比如压缩和临时目录 mapred-site.xml <property> <name>mapreduce.map.output.compress</name> <value>true</value>…

1)将coordinator和executor角色分离 By default, each host in the cluster that runs the impalad daemon can act as the coordinator for an Impala query, execute the fragments of the execution plan for the query, or both. During highly concurrent workloads for l…

1 准备analyzer 内置analyzer 参考:https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-analyzers.html 中文分词 smartcn 参考:https://www.elastic.co/guide/en/elasticsearch/plugins/current/analysis-smartcn.html ik $ bin/elasticsearch-plugin insta…

ElasticSearch 6.6.0 官方:https://www.elastic.co/ 一 简介 ElasticSearch简单来说是对lucene的分布式封装,增加了shard(每个shard是一个子索引,也是一个lucene的index)和replica的概念:所以在ElasticSearch也可以见到lucene中的概念,比如index.document等. Elasticsearch is a highly scalable open-source full-text search…

Index Settings 重要索引配置 Index level settings can be set per-index. Settings may be: 1 static 静态索引配置 They can only be set at index creation time or on a closed index. 只能在创建索引时设置或者在closed状态的索引上设置: index.number_of_shards The number of primary shards that…

Fortunately, Elasticsearch provides a very comprehensive and powerful REST API that you can use to interact with your cluster. Among the few things that can be done with the API are as follows: Check your cluster, node, and index health, status, and…

elasticsearch版本升级方案 常用的滚动升级过程(Rolling Upgrade)如下: $ curl -XPUT '$es_server:9200/_cluster/settings?pretty' -H 'Content-Type: application/json' -d '{"transient":{"cluster.routing.allocation.enable":"none"}}'$ curl -XPOST '$es_s…

核心枚举 public enum ServerState { LOOKING, FOLLOWING, LEADING, OBSERVING; } zookeeper服务器状态:刚启动LOOKING,follower是FOLLOWING,leader是LEADING,observer是OBSERVING: public enum LearnerType { PARTICIPANT, OBSERVER; } 简单来说,zookeeper启动的核心类是QuorumPeerMain,启动之后会加载配置,…

ElasticSearch ElasticSearch是什么 ElasticSearch是一个基于Lucene的搜索服务器.它提供了一个分布式多用户能力的全文搜索引擎,基于RESTful web接口.Elasticsearch是用Java语言开发的,并作为Apache许可条款下的开放源码发布,是一种流行的企业级搜索引擎.ElasticSearch用于云计算中,能够达到实时搜索,稳定,可靠,快速,安装使用方便.官方客户端在Java..NET(C#).PHP.Python.Apache Groovy…

目录视图 摘要视图 订阅 [观点]物联网与大数据将助推工业应用的崛起,你认同么?      CSDN日报20170703——<从高考到程序员——我一直在寻找答案>      [直播]探究Linux的总线.设备.驱动模型! 数据倾斜是多么痛?spark作业调优秘籍 2017-06-27 13:28 39人阅读 评论(0) 收藏 举报  分类: Spark(124)  原文:https://mp.weixin.qq.com/s?__biz=MzI5OTAwMTM1MQ==&mid=2456…