mongodb stores samples inefficiently

[gordon chung]

this is a sample

{
 "_id" : ObjectId("550b104abf4d2c37a4557ab3"),
 "counter_name" : "image",
 "user_id" : null,
 "resource_id" : "0a071d35-5970-41d1-9eae-c093b18c1e7d",
 "timestamp" : ISODate("2015-03-19T18:05:57.540Z"),
 "message_signature" : "03a7c6848ecf3c09ab529e7e3ed4b825339b8280d9a44b3cd91305f734d2eb63",
 "message_id" : "c10f8646-ce62-11e4-835e-28b2bd01ed52",
 "source" : "openstack",
 "counter_unit" : "image",
 "counter_volume" : 1,
 "recorded_at" : ISODate("2015-03-19T18:07:06.949Z"),
 "project_id" : "a9d933eefc2c4da28b5df1ca415752e5",
 "resource_metadata" : {
  "status" : "active",
  "deleted_at" : null,
  "event_type" : "image.update",
  "name" : "cirros-0.3.2-x86_64-uec-ramdisk",
  "deleted" : false,
  "container_format" : "ari",
  "created_at" : "2015-03-19T18:05:56.000000",
  "disk_format" : "ari",
  "updated_at" : "2015-03-19T18:05:57.000000",
  "id" : "0a071d35-5970-41d1-9eae-c093b18c1e7d",
  "min_disk" : 0,
  "host" : "image.localhost",
  "protected" : false,
  "min_ram" : 0,
  "checksum" : "68085af2609d03e51c7662395b5b6e4b",
  "owner" : "a9d933eefc2c4da28b5df1ca415752e5",
  "is_public" : true,
  "virtual_size" : null,
  "properties" : {

  },
  "size" : 3723817
 },
 "counter_type" : "gauge"}

this is a resource:

{
 "_id" : "6737e64d-4051-42da-a5fd-5b10a0a6878c",
 "source" : "openstack",
 "project_id" : "a9d933eefc2c4da28b5df1ca415752e5",
 "user_id" : null,
 "first_sample_timestamp" : ISODate("2015-03-19T18:05:59.636Z"),
 "last_sample_timestamp" : ISODate("2015-03-19T19:16:51Z"),
 "metadata" : {
  "status" : "active",
  "name" : "cirros-0.3.2-x86_64-uec",
  "deleted" : false,
  "container_format" : "ami",
  "created_at" : "2015-03-19T18:05:58.000000",
  "disk_format" : "ami",
  "updated_at" : "2015-03-19T18:05:59.000000",
  "protected" : false,
  "min_ram" : 0,
  "checksum" : "4eada48c2843d2a262c814ddc92ecf2c",
  "min_disk" : 0,
  "is_public" : true,
  "deleted_at" : null,
  "properties" : {
   "kernel_id" : "59b465f5-60f0-41df-b3a9-bb30f8895552",
   "ramdisk_id" : "0a071d35-5970-41d1-9eae-c093b18c1e7d"
  },
  "size" : 25165824
 },
 "meter" : [
  {
   "counter_name" : "image",
   "counter_unit" : "image",
   "counter_type" : "gauge"
  },
  {
   "counter_name" : "image.upload",
   "counter_unit" : "image",
   "counter_type" : "delta"
  },
  {
   "counter_name" : "image.update",
   "counter_unit" : "image",
   "counter_type" : "delta"
  },
  {
   "counter_name" : "image.size",
   "counter_unit" : "B",
   "counter_type" : "gauge"
  },
  {
   "counter_name" : "image.download",
   "counter_unit" : "B",
   "counter_type" : "delta"
  },
  {
   "counter_name" : "image.serve",
   "counter_unit" : "B",
   "counter_type" : "delta"
  }
 ]
}

[gordon chung (chungg)]

this isn't worth the investment.