ElasticSearch

• https://www.elastic.co/
• Elasticsearch 权威指南（中文版）

已经有网友整理出了一个cheatsheet http://elasticsearch-cheatsheet.jolicode.com

了解当前集群健康状态 http://localhost:9200/_cat/health?v

了解各个index-shard状态 http://localhost:9200/_cat/shards/

查看是因为什么原因导致某个shard出于unassigned状态(?help查看有哪些可选字段) http://localhost:9200/_cat/shards/?h=share,index,unassigned.reason

如果只有一台机器serve的话，可以将replication number设置为0

curl -XPUT http://localhost:9200/_settings -d '{ "number_of_replicas" :0 }'

如果shard处于unassigned状态，并且是primary shard的话，可以使用下面这个脚本强制assigned.

• https://gist.github.com/ianblenke/6422bed17090bb4f1712.
• http://stackoverflow.com/questions/23656458/elasticsearch-what-to-do-with-unassigned-shards

curl -XPUT localhost:9200/_cluster/settings -d '{
                "transient" : {
                    "cluster.routing.allocation.enable" : "all"
                }
        }'

curl -s localhost:9200/_cat/shards | grep UNASS | while read line ; do \
  read -a fields <<<"$line" ;
  curl -XPOST -d '{
    "commands" : [
      {
        "allocate" : {
          "index" : "'${fields[0]}'",
          "shard" : '${fields[1]}',
          "node" : "elasticsearch-'$(hostname)'",
          "allow_primary": "true"
        }
      }
    ]
  }' http://localhost:9200/_cluster/reroute?pretty ; done