##Install :
This is a standard Golang project. Go to the project and install it . See also [https://golang.org/doc/install]
go install##Getting started :
Once you have installed, you can run the waldo executable using command lines.
###Help
./waldo -h
Usage of /home/grego/go/bin/waldo:
-key string
Key of the photo
-readers int
Number of workers reading photos (default 12)
-writers int
Number of workers indexing photos (default 12)Note: Use either -key if you want to query a photo or you will run the read/write program.
###Run the program
./waldo
worker 3 indexing photo 01a2539a-9e53-4050-a6b5-d94f0ee6cc55.10ab5118-b1e5-4ac9-922e-125138dbdf87.jpg
worker 7 indexing photo 01a11242-35d0-4865-8f90-5db01a30ed51.e8ae7a45-8b4c-4142-b3d2-0f631d543b20.jpg
worker 5 indexing photo 01DD6669-1AF1-4A46-9D32-75FDD2882D17.ede96cc7-5500-4b3a-8828-26aabcaa2f4c.jpg
...
worker 4 indexing photo 01a8f6cd-3239-43ce-b756-95abf64a1b12.bf54b6d2-542e-4c48-8a8a-53b47e6b91d5.jpg
worker 12 indexing photo 01b819c4-c765-4dca-a407-609b64954126.a17c6591-de20-4b75-a5de-0bb11a34a116.jpg
worker 8 indexing photo 0188017b-0d90-4cab-9009-bbb74501c3d5.ede96cc7-5500-4b3a-8828-26aabcaa2f4c.jpg
FINISHED 129 photos have been processedYou should see the FINISHED flag with the total number of photos that have been read and indexed.
You might want to add more readers or writers and test performance by setting writers and readers command flags.
###Make a query to check a photo EXIF data
$GOPATH/bin/waldo -key 0009fcfe-376e-42fe-85a2-85ee7d2193d0.0649232a-b406-4ec1-b175-ba0d91aa3e7c.jpg
Artist =
Copyright =
DateTime = 2016:06:09 17:24:35
DateTimeDigitized = 2016:06:09 17:24:35
DateTimeOriginal = 2016:06:09 17:24:35
InteroperabilityIndex = R98
Make = NIKON CORPORATION
Model = NIKON D750
Software = Ver.1.02
SubSecTime = 32
SubSecTimeDigitized = 32
SubSecTimeOriginal = 32##Concurrency
Since I/O network resources and Disk I/O are the main bottleneck I have separated consumer from producer and made each process concurrent. The producer process reads and parses EXIF data. I called it Reader. The consumer process (Indexer) indexes EXIF data into a LevelDB data store.
This is a "concurrent read concurrent write" parallel memory model in which multiple go routine can read simultaneously , and multiple indexers can write simultaneously to a single LevelDB datastore.
The number of consumers rand producers are limited and configurable.
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