Does hortonworks provide native JSON support to HBase or has nested json data model?. If so Any resources ? If this question is already answered somewhere,can you please point me that.
Apache HBase does not provide any API around JSON, but you can build your own.
You might be interested in following the following JIRA issue about adding JSON as a native type to Apache Phoenix: PHOENIX-628
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Please take a look at hbase-client/src/main/java/org/apache/hadoop/hbase/util/JsonMapper.java for example of conversion.