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Enhancement
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Resolution: Done
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Major
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0.9.4.Final
io.debezium.connector.mongodb.Replicator class doesn't use batch size to limit memory allocation of MongoDB cursor:
try (MongoCursor<Document> cursor = docCollection.find().iterator()) { while (running.get() && cursor.hasNext()) { Document doc = cursor.next(); logger.trace("Found existing doc in {}: {}", collectionId, doc); counter += factory.recordObject(collectionId, doc, timestamp); } }
MongoDB server chooses an appropriate batch size if the size isn't specified.
I propose to add the following option:
| Property | Default | Description |
|---|---|---|
| documents.fetch.size | 0 | Positive integer value that specifies the maximum number of documents that should be read in one go from each collection while taking a snapshot. The connector will read the collection contents in multiple batches of this size. Default to 0, which indicates that the server chooses an appropriate fetch size. |
