druid/docs/content/DataSourceMetadataQuery.md

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Data Source Metadata Queries

Data Source Metadata queries return metadata information for a dataSource. It returns the timestamp of latest ingested event for the datasource. The grammar is:

{
    "queryType" : "dataSourceMetadata",
    "dataSource": "sample_datasource",
}

There are 2 main parts to a Data Source Metadata query:

property	description	required?
queryType	This String should always be "dataSourceMetadata"; this is the first thing Druid looks at to figure out how to interpret the query	yes
dataSource	A String defining the data source to query, very similar to a table in a relational database	yes
context	An additional JSON Object which can be used to specify certain flags.	no

The format of the result is:

[ {
  "timestamp" : "2013-05-09T18:24:00.000Z",
  "result" : {
    "maxIngestedEventTime" : "2013-05-09T18:24:09.007Z",
  }
} ]