i use this configure

Scaling - NodeBB Documentation

but after a few days nodebb dead
so i check service, found mongodb not running
the mongod log last line show nodebb get lots of post

2018-08-28T14:40:05.667+0800 I COMMAND  [conn28] command nodebb.objects command: getMore { getMore: 24796725858, collection: "objects", batchSize: 1000, lsid: { id: UUID("xxx") }, $readPreference: { mode: "secondaryPreferred" }, $db: "no
debb" } originatingCommand: { find: "objects", filter: { _key: { $in: [ "post:63437".......... "post:98592" ] } }, projection: { _id: 0 }, returnKey: false, showRecordId: false, lsid: { id: UUID("xxx") }, $db: "nodebb" } planSummary: IXSCAN { _key: 1, value: -1 } cursorid:24796725858 keysExamined:840 docsExamined:424 cursorExhausted:1 numYields:10 nreturned:424 reslen:163097 locks:{ Global: { acquireCount: { r: 11 } }, Database: { acquireCount: { r: 11 } }, Collection: { acquireCount: { r: 11 } } } protocol:op_query 242ms

the mongod config is from apt source

i want know what makes mongodb stop, not set daemon let it restart frequently

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