Ta yaya ake canja mapping da reindex da aliases?

Question

IT Interview Practice · Accepted Answer

Alias suna ne mai ɗorewa da ke nuni zuwa index. Idan field yana buƙatar canjin mapping marar jituwa, gina sabon index kuma ka matsar da sunan bayan duba bayanan da aka kwafe.

## Ga hoton canjin

```text
Before: application -> products -> products-v1
After:  application -> products -> products-v2
```

Manhajar tana ci gaba da amfani da `products`. Da farko ƙirƙiri `products-v2` da mapping da saitunan da ake so. Reindex yana kwafe documents; ba ya kwafe configuration na source index kai tsaye.

## Yi migration mai sauƙi idan tsayar da rubutu ya dace

- Dakatar da rubutun manhaja, har da background writers, amma bar karatu a buɗe idan ya dace.
- Yi reindex daga v1 zuwa v2, binciki failures, kuma duba representative documents da queries bayan sa bayanan da aka kwafe su zama abin bincike.
- Canja alias, gwada karatu da rubutun manhaja, sannan ka ci gaba da writers.

Ga alias da ke nuni zuwa v1 kawai yanzu, wannan buƙatar Kibana Dev Tools tana yin sauyin cikin alias update ɗaya:

```http
POST /_aliases
{
  "actions": [
    {"remove":{"index":"products-v1","alias":"products","must_exist":true}},
    {"add":{"index":"products-v2","alias":"products","is_write_index":true}}
  ]
}
```

Duba amsar kafin dawo da rubutu. Wannan yana kauce wa tazara tsakanin remove da add daban; ba ya kwafe canje-canjen da suka kuɓuce yayin migration.

## Idan rubutu ba zai iya tsayawa ba

Kana buƙatar rikodi mai ɗorewa na canje-canjen lokacin kwafi da hanyar sake aiwatar da updates da deletes ba tare da tsohon data ya rufe sabon ba. Wannan wani synchronization design ne daban. Bar v1 na ɗan lokaci, amma kada ka ɗauka komawa baya ba zai rasa data ba bayan sabbin rubuce-rubuce sun isa v2.

[Takardun hukuma](https://www.elastic.co/docs/manage-data/data-store/aliases).

Ga hoton canjin

Yi migration mai sauƙi idan tsayar da rubutu ya dace

Idan rubutu ba zai iya tsayawa ba

Tambayoyi masu alaƙa