[jira] [Created] (BEAM-2605) Exception raised when using MongoDBIO.Write in streaming mode

["Pascal Castéran (JIRA)" <ji...@apache.org>]

Pascal Castéran created BEAM-2605:
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             Summary: Exception raised when using MongoDBIO.Write in streaming mode
                 Key: BEAM-2605
                 URL: https://issues.apache.org/jira/browse/BEAM-2605
             Project: Beam
          Issue Type: Bug
          Components: sdk-java-extensions
    Affects Versions: 2.0.0
            Reporter: Pascal Castéran
            Assignee: Davor Bonaci


In org.apache.beam.sdk.io.mongodb.MongoDbIO.Write.WriteFn#flush(), no check is done on the size of the batch list of documents before executing the _*insertMany*_ operation.

In streaming mode, when processing an empty pane, an empty list of documents in passed to the MongoDB client which results in the following exception:
{quote}java.lang.IllegalArgumentException: state should be: writes is not an empty list
	at com.mongodb.assertions.Assertions.isTrueArgument(Assertions.java:99)
	at com.mongodb.operation.MixedBulkWriteOperation.<init>(MixedBulkWriteOperation.java:95)
	at com.mongodb.MongoCollectionImpl.insertMany(MongoCollectionImpl.java:323)
	at com.mongodb.MongoCollectionImpl.insertMany(MongoCollectionImpl.java:311)
	at org.apache.beam.sdk.io.mongodb.MongoDbIO$Write$WriteFn.flush(MongoDbIO.java:513)
	at org.apache.beam.sdk.io.mongodb.MongoDbIO$Write$WriteFn.finishBundle(MongoDbIO.java:506){quote}



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