从 mongoDB 迁移后的 AWS DocumentDB 错误

Question

我的应用程序从MongoDB转移到DocumentDB。迁移后我收到这些错误，尽管我解决了与 AWS DocumentDB 的连接问题。

MongoError: namespace name generated from index name is too long
    at /app/node_modules/mongodb-core/lib/connection/pool.js:581:63
    at authenticateStragglers (/app/node_modules/mongodb-core/lib/connection/pool.js:504:16)
    at Connection.messageHandler (/app/node_modules/mongodb-core/lib/connection/pool.js:540:5)
    at emitMessageHandler (/app/node_modules/mongodb-core/lib/connection/connection.js:310:10)
    at TLSSocket.<anonymous> (/app/node_modules/mongodb-core/lib/connection/connection.js:453:17)
    at emitOne (events.js:116:13)
    at TLSSocket.emit (events.js:211:7)
    at addChunk (_stream_readable.js:263:12)
    at readableAddChunk (_stream_readable.js:250:11)
    at TLSSocket.Readable.push (_stream_readable.js:208:10)
    at TLSWrap.onread (net.js:601:20)
  ok: 0,
  errmsg: 'namespace name generated from index name is too long',
{ MongoError: system collection creation not supported
    at Function.create (/app/node_modules/mongodb-core/lib/error.js:43:12)
    at db.s.topology.insert (/app/node_modules/mongodb/lib/operations/db_ops.js:329:54)
    at handler (/app/node_modules/mongodb-core/lib/topologies/replset.js:1197:22)
    at /app/node_modules/mongodb-core/lib/connection/pool.js:532:18
    at _combinedTickCallback (internal/process/next_tick.js:132:7)
    at process._tickCallback (internal/process/next_tick.js:181:9)
  index: 0,
  code: 73,
  errmsg: 'system collection creation not supported',
  name: 'MongoError',
  [Symbol(mongoErrorContextSymbol)]: {} }
ensuring Indexing

Answer 1

看起来您正在达到 DocumentDB 中的索引名称限制。如果可能，请尝试创建较短的索引。请参阅此文档以更好地了解 DocumentDB 限制：
https://docs.aws.amazon.com/documentdb/latest/developerguide/limits.html#limits.naming

Answer 2

事实上令我们惊讶，而https://docs.aws.amazon.com/documentdb/latest/developerguide/limits.html#limits.naming

提到"索引名称"约束只能允许混淆Length is [3–63] characters.在约束的名称中。术语"索引名称"实际上是$。

所以，最终你只剩下63 - length of collection_name - 1 (for $ symbol)

虽然我们已向 AWS 报告了此问题，但我们使用 mongo 提供name属性来显式设置索引name以便继续操作。

事实上，根据"Mongo 4.0 索引键限制"文档，Mongo 允许索引名称最多 128 个字符参考： https://docs.mongodb.com/v4.0/reference/limits/#Index-Key-Limit