Upload Data to druid Incrementally - druid

Question

I need to upload data to an existing model. This has to be done on daily basis. I guess some changes needs to be done in the index file and i am not able to figure out. I tried pushing the data with the same model name but the parent data was removed.
Any help would be appreciated.
Here is the ingestion json file :
{
"type" : "index",
"spec" : {
"dataSchema" : {
"dataSource" : "mksales",
"parser" : {
"type" : "string",
"parseSpec" : {
"format" : "json",
"dimensionsSpec" : {
"dimensions" : ["Address",
"City",
"Contract Name",
"Contract Sub Type",
"Contract Type",
"Customer Name",
"Domain",
"Nation",
"Contract Start End Date",
"Zip",
"Sales Rep Name"
]
},
"timestampSpec" : {
"format" : "auto",
"column" : "time"
}
}
},
"metricsSpec" : [
{ "type" : "count", "name" : "count", "type" : "count" },
{"name" : "Price","type" : "doubleSum","fieldName" : "Price"},
{"name" : "Sales","type" : "doubleSum","fieldName" : "Sales"},
{"name" : "Units","type" : "longSum","fieldName" : "Units"}],
"granularitySpec" : {
"type" : "uniform",
"segmentGranularity" : "day",
"queryGranularity" : "none",
"intervals" : ["2000-12-01T00:00:00Z/2030-06-30T00:00:00Z"],
"rollup" : true
}
},
"ioConfig" : {
"type" : "index",
"firehose" : {
"type" : "local",
"baseDir" : "mksales/",
"filter" : "mksales.json"
},
"appendToExisting" : false
},
"tuningConfig" : {
"type" : "index",
"targetPartitionSize" : 10000000,
"maxRowsInMemory" : 40000,
"forceExtendableShardSpecs" : true
}
}
}

Answer 1

There are 2 ways using which you can append/update the data to an existing segment.
Reindexing and Delta Ingestion
You need to reindex your data every time new data comes in a particular segment.(In your case its day) For the reindexing you need to give all the files having data for that day.
For Delta Ingestion you need to use inputSpec type="multi"
You can refer the documentation link for more details - http://druid.io/docs/latest/ingestion/update-existing-data.html