# Kalavara
[](https://travis-ci.org/shanavas786/kalavara)
[](https://gitlab.com/shanavasm/kalavara/pipelines)
A distributed persistent key value store that speaks http. Inspired by
[minkeyvalue](https://github.com/geohot/minikeyvalue).
# master server
Master server stores index (key, url of volume server where the value is
stored) in rocksdb. Requests are redirected to curresponding volume server
after metadata is updated.
to start the server, run
```sh
master -p 6000 -d /tmp/kalavadb -v http://volume1:6001 http://volume2:6002
```
# volume server
Volume server stores values in file system. For atomicity temporary files are
first created in `destdir/tmp` directory and then moved to destination path.
For this approach to work, `destdir/tmp` and destination path should be in same
file system
to start the volume server, run
```sh
master -p 7000 -d /tmp/kalavarastore
```
## Usage
1. insert a key-value
```sh
curl -XPUT -L -d value http://localhost:6000/store/key
```
2. retrive value
```sh
curl -XGET -L http://localhost:6000/store/key
```
3. delete a key
```sh
curl -XDELETE -L http://localhost:6000/store/key
```
# Performance
```sh
./wrk -t2 -c100 -d10s http://localhost:6000/missingkey
Running 10s test @ http://localhost:6000/missingkey
2 threads and 100 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 2.04ms 1.61ms 28.98ms 83.07%
Req/Sec 21.33k 4.76k 34.42k 66.00%
426423 requests in 10.07s, 65.88MB read
Non-2xx or 3xx responses: 426423
Requests/sec: 42359.95
Transfer/sec: 6.54MB
```
# License
<p xmlns:dct="http://purl.org/dc/terms/"
xmlns:vcard="http://www.w3.org/2001/vcard-rdf/3.0#"> <a rel="license"
href="http://creativecommons.org/publicdomain/zero/1.0/"> <img
src="http://i.creativecommons.org/p/zero/1.0/88x31.png" style="border-style:
none;" alt="CC0" /> </a> <br />
To the extent possible under law, the author(s) have dedicated all copyright
related and neighboring rights to this software to the public domain worldwide.
This software is distributed without any warranty.
</p>