JSON Performance

I have some code that processes tweets, about 5 million a day, in realtime. They are currently stored in mongodb and also posted on various celery/rabbitmq work queues. The average message size is 5524, so encoding and decoding these messages is an issue.

Using the following test code below.

Standard Tweet message Encode/Decode with python built-in json package.

message size

Test	Msg Size	De-serialize	Obj Size	Serialize cjosn, bson, ujson	Storage	Storoge Cost
Empty object	41	14.790, 37.565, 0.970	54	6.341, 41.856, 1.249	2050Mb	0.21	{}
Empty list	41	15.069, 38.021, 1.005	54	6.675, 41.475, 1.400	2050Mb	0.21	[]
Object of objects	843	107.750, 145.440, 25.525	3226	63.555, 828.235, 28.051	42150Mb	4.21
List of lists	563	58.805, 81.950, 16.960	104	43.426, 815.965, 18.311	28150Mb	2.81
Object with only tweet id	93	25.030, 53.360, 2.280	422	23.570, 83.445, 3.295	4650Mb	0.47
Full tweet message	4386	697.221, 867.780, 188.560	12606	360.290, 5847.335, 201.610	219300Mb	21.93	https://gist.github.com/thanos/adf7e20b5f00551a38a8
Message with string payload	4899	446.661, 489.455, 82.361	9170	104.254, 327.455, 92.460	244950Mb	24.50
Object where the field names are codes	4396	422.220, 456.184, 75.035	7880	73.345, 231.071, 81.570	219800Mb	21.98
Only fields of interest	1911	285.840, 375.440, 74.100	7290	147.895, 2252.359, 78.495	95550Mb	9.55	https://gist.github.com/thanos/adf7e20b5f00551a38a8
Only fields of interest, keys encoded	1660	288.585, 378.330, 67.400	7290	143.045, 2246.330, 70.940	83000Mb	8.30
Denormalized Tweet	4707	603.030, 716.414, 186.300	9246	350.465, 5802.315, 198.150	235350Mb	23.54
Denormalized Tweet with only needed fields	2158	255.200, 318.004, 77.040	6378	142.004, 2165.425, 71.850	107900Mb	10.79
Denormalized Tweet with only needed fields, keys encoded	1734	242.375, 305.970, 65.689	6378	133.420, 2165.465, 68.730	86700Mb	8.67
Possilble Candidate	1911	291.691, 380.090, 74.741	7290	156.535, 2258.445, 77.696	95550Mb	9.55

Source code of test script

Empty object

{}

Empty list

[]

Object of objects

List of lists

Object with only tweet id

Full tweet message

Message with string payload

Object where the field names are codes

Only fields of interest

Denormalized Tweet

Denormalized Tweet with only needed fields

Denormalized Tweet with only needed fields, keys encoded

Replacing ARRI lights

My aim is to replace my very hot ARRI lights. I've ought on ebay a  Bi-color 1500W LED Fresnel Video Spotlight Light from  Xiamen Came Photographic Equipment Co., Ltd.(http://stores.ebay.com/PhotoLight) 

I came with two problems 

1) It didn't have a fresnel lens as advertised. Okay I could live with this if it wasn't for problem number two:

2) The focus adjust button didn't work. I feels as if it's poped out of it's thread.

Now I'm talking to Came and hopefully they will resolve these problems. If so it will be a great light!