兩種方式 嵌套和父子關(guān)聯(lián)
創(chuàng)新互聯(lián)從2013年創(chuàng)立,是專業(yè)互聯(lián)網(wǎng)技術(shù)服務(wù)公司,擁有項(xiàng)目做網(wǎng)站、成都網(wǎng)站建設(shè)網(wǎng)站策劃,項(xiàng)目實(shí)施與項(xiàng)目整合能力。我們以讓每一個(gè)夢想脫穎而出為使命,1280元崇左做網(wǎng)站,已為上家服務(wù),為崇左各地企業(yè)和個(gè)人服務(wù),聯(lián)系電話:028-86922220Nested
Nested docs are stored in the same Lucene block as each other, which helps read/query performance. Reading a nested doc is faster than the equivalent parent/child.
Updating a single field in a nested document (parent or nested children) forces ES to reindex the entire nested document. This can be very expensive for large nested docs
"Cross referencing" nested documents is impossible
Best suited for data that does not change frequently
Parent/Child
Children are stored separately from the parent, but are routed to the same shard. So parent/children are slightly less performance on read/query than nested
Parent/child mappings have a bit extra memory overhead, since ES maintains a "join" list in memory
Updating a child doc does not affect the parent or any other children, which can potentially save a lot of indexing on large docs
Sorting/scoring can be difficult with Parent/Child since the Has Child/Has Parent operations can be opaque at times
綜上所述,兩種方式均有利弊,官方建議,自己處理關(guān)聯(lián)關(guān)系,減輕ES的壓力。
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