What does it mean when the tag value returned in an opentsdb query response is "node"?

This is relevant to Opentsdb 2.3.1 writing to Google Cloud BigTable (the Opentsdb config can be found here).

I'm writing to OpenTSDB time series like this (via the HTTP API -- api/put) like so:

{
   "metric": "w.builder.9",
   "timestamp": 1535504606,
   "value": 1,
   "tags": {
      "tid": "1",
      "wid": "21",
      "vid": "17"
   }   
}

where wid and vid are just integers (surrounded by quotes).

Now when I run a simple query with no aggregation, i.e.

{
  "start": "1h-ago",
  "queries": [
    {
      "metric": "w.builder.9",
      "aggregator": "none"
    }
  ]
}

QUERY RESPONSE

[
    {
        "metric": "w.builder.9",
        "tags": {
            "wid": "node",
            "tid": "1",
            "vid": "node"
        },
        "aggregateTags": [],
        "dps": {
            "1535503901": 1,
            "1535503951": 1,
            "1535504407": 1,
            "1535504576": 1
        }
    },
    {
        "metric": "w.builder.9",
        "tags": {
            "wid": "node",
            "tid": "1",
            "vid": "node"
        },
        "aggregateTags": [],
        "dps": {
            "1535503881": 1,
            "1535503960": 1,
            "1535503982": 1,
            "1535504389": 1,
            "1535504402": 1
        }
    }
]

Why are tag values for wid and vid = "node"?

There are 2 reasons this was happening:

1. The data is stored in Bigtable instead of HBase.
2. The config had salting enabled.

I removed the following line from our config and the issue went away:

tsd.storage.salt.width = 1