Ta yaya search_after da PIT suke taimaka wa deep pagination?

Question

IT Interview Practice · Accepted Answer

Yi amfani da `search_after` don ci gaba bayan sakamakon ƙarshe na shafin da ya gabata. Yi amfani da PIT, wato view na bincike a wani takamaiman lokaci, don riƙe dataset a tsaye yayin tafiya cikin shafuka.

## Buɗe view ka karanta shafi na farko

A Kibana Dev Tools, buɗe PIT:

```http
POST /products/_pit?keep_alive=1m
```

Kwafe `id` da aka mayar zuwa placeholder da ke ƙasa. Ka ɗauka `price` numeric field ne; lifetime da page size na misali ne:

```http
POST /_search
{
  "size": 2,
  "pit": {"id":"PIT_ID_FROM_RESPONSE","keep_alive":"1m"},
  "query": {"match_all":{}},
  "sort": [{"price":"asc"},{"_shard_doc":"asc"}]
}
```

Ka ɗauka hit na ƙarshe yana da `"sort": [120, 17]`. Farashi shi ne 120; ƙima ta biyu tana bambance hits masu farashi ɗaya cikin wannan PIT.

## Yi amfani da wannan array ɗin daidai ga shafi na gaba

```http
POST /_search
{
  "size": 2,
  "pit": {"id":"LATEST_PIT_ID","keep_alive":"1m"},
  "query": {"match_all":{}},
  "sort": [{"price":"asc"},{"_shard_doc":"asc"}],
  "search_after": [120, 17]
}
```

Maye gurbin placeholder da PIT ID na baya-bayan nan da aka mayar. Bar query da sort yadda suke, kuma ka kwafe duk sort values daga ainihin hit na ƙarshe maimakon lissafa su. Rufe PIT idan ka gama; idan ya ƙare, ana buƙatar fayyace hanyar sake farawa domin sabon view zai iya samun bayanai daban. Wannan ya dace da tafiya bi da bi, ba tsalle kai tsaye zuwa kowane lambar shafi ba.

[Takardun hukuma](https://www.elastic.co/docs/reference/elasticsearch/rest-apis/paginate-search-results).

Buɗe view ka karanta shafi na farko

Yi amfani da wannan array ɗin daidai ga shafi na gaba

Tambayoyi masu alaƙa