不爲也 比不能也

Elasticsearch provides failover capabilities by keeping multiple copies of your data in the cluster. In presence of network disruptions or failing nodes, changes might not make it to all the copies. This blog post showcases one of the internal mechanics of Elasticsearch to identify shard copies that are missing changes, providing an in-depth view on how two central components, the consensus modu..

Beep… beep… beep… It’s PagerDuty telling you that a node has gone down, or a rack has gone down, or your whole cluster has just rebooted. Either way, your cluster is RED: some shards are not assigned, which means that your data is not fully available.bepp... bepp... bepp... 호출기가 울린다. node 혹은 rack에 장애가 발생했다. 또는 전체 cluster가 reboot 되었다. 어느 쪽이든 cluster가 RED(일부 shard가 할당되지 않았다. 즉, data를 완전히 사용할 수 없다...

Here are some great slides from our Core Elasticsearch: Operations course that help explain the concept. We'd recommend that you take the full course to understand this even better, but I'll provide an overview from our training here:다음은 Core Elasticsearch: Operations 과정(개념을 설명하는)에서 제공하는 몇 개의 멋진 slide이다. 이 내용을 더 잘 이해하기 위해서는 전체 과정을 수강하는 것이 좋겠지만, 여기에서 과정의 개요를 제공한다.Shard allocation is the process o..

From Elasticsearch 5.0 on all settings are validated before they are applied. Node level and default index level settings are validated on node startup, dynamic cluster and index setting are validated before they are updated/added to the cluster state.Elasticsearch 5.0 부터 모든 설정의 적용되기 전에 유효성을 검사한다. node level과 index level 설정은 시작 시에 유효성이 검사되고, 동적 cluster 및 index 설정은 cluster state에 업데이트/추가되기 전에 유효성..