Ta yaya ake binciken Elasticsearch cluster mai yellow ko red?

Question

IT Interview Practice · Accepted Answer

Yellow yana nufin an ware primary data shards amma aƙalla replica copy ɗaya ba ta da node da aka ware mata. Red yana nufin aƙalla primary ɗaya ba shi da node, don haka wasu bayanai na iya zama ba a samunsu.

## Gano shard ɗin da ya shafa

A Kibana Dev Tools, fara da:

```http
GET /_cat/shards?v&h=index,shard,prirep,state,node
```

Layin misali `products 0 r UNASSIGNED` yana nufin replica `r` na shard 0 ba ta da wurin zuwa. Idan `p`, wato primary, shi ne ba a ware ba, binciki samuwar data cikin gaggawa.

## Tambayi dalilin ƙin allocation

Ga wannan replica, nemi bayani:

```http
GET /_cluster/allocation/explain
{
  "index": "products",
  "shard": 0,
  "primary": false
}
```

Karanta `can_allocate` da shawarar allocation ta kowane node. Ƙin saboda disk space yana kaiwa ga duba capacity; ƙa'idar da ta hana duk nodes masu samuwa tana kaiwa ga bitar ƙa'idar. Wannan yana sauya launin cluster zuwa takamaiman dalilin da za a gyara.

## Farfaɗo ba tare da jefar da data ba

Development cluster mai node ɗaya ba zai iya sanya replica kusa da primary ɗinta ba. Rage replicas zai iya dacewa a nan, amma yana cire redundancy. A production, dawo da albarkatu ko ingantaccen kwafi, ko yi amfani da snapshot da aka gwada idan ya zama dole. Kada ka tilasta primary marar data ko tsoho don samun green kawai: hakan zai iya rasa data. Tabbatar da allocation da halayyar manhaja bayan farfaɗowa.

[Takardun hukuma](https://www.elastic.co/docs/troubleshoot/elasticsearch/red-yellow-cluster-status).

Gano shard ɗin da ya shafa

Tambayi dalilin ƙin allocation

Farfaɗo ba tare da jefar da data ba

Tambayoyi masu alaƙa