Tranquility 0.8.3 fails to start with JSON Flatten Spec

[Sowmya Dixit]

Hi,

I am using Tranquility 0.8.3 to push real-time streams. I need to push nested JSON objects and I have implemented using JSON Flatten Spec. Tranquility fails to start when root type field is specified. Stacktrace below.





Caused by: com.fasterxml.jackson.databind.JsonMappingException: Instantiation of [simple type, class io.druid.data.input.impl.StringInputRowParser] value failed: json can not be null or empty

        at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.wrapException(StdValueInstantiator.java:405)

        at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createFromObjectWith(StdValueInstantiator.java:234)

        at com.fasterxml.jackson.databind.deser.impl.PropertyBasedCreator.build(PropertyBasedCreator.java:167)

        at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:398)

        at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1064)

        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:264)

        at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:156)

        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:126)

        at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedForId(AsPropertyTypeDeserializer.java:113)

        at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:84)

        at com.fasterxml.jackson.databind.deser.AbstractDeserializer.deserializeWithType(AbstractDeserializer.java:132)

        at com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:41)

        at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:2769)

        ... 29 more

[Jonathan Wei]

Can you provide your tranquility spec?

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[Sowmya Dixit]

Hi,

Here is the tranquility spec I am using.

[Jonathan Wei]

There was a bug in JSONPathParser that was fixed in Druid 0.10.0, where even for "root" fields it tries to compile a path from the "expr" field: https://github.com/apache/incubator-druid/commit/151ff6d064d5ff36141f4ac5741111773ca2514b#diff-331c0b9aed8bb0b36ddd1f9801a1fc25

However, Tranquility is still built against an older version of Druid without that fix, so you'll need to put a non-empty dummy value for "expr" on all of the "root" type fields.

To view this discussion on the web visit https://groups.google.com/d/msgid/druid-user/6083c11a-5c28-4e9e-b301-c668dfa8d773%40googlegroups.com.

[Sowmya Dixit]

Thanks Jonathan Wei. It worked after adding non-empty dummy value for "expr" on all of the "root" type fields.