SSDB - A LevelDB server with zset data type
SSDB is a high performace key-value(key-string, key-zset, key-hashmap) NoSQL persistent storage server, using Google LevelDB as storage engine.
Features
- LevelDB client-server support, written in C/C++
- Persistent key-value, key-zset, key-map('hashmap') storage
- Client API supports including C/C++, PHP, Python, Cpy, Java
- Online backup, fast recover
- Replication(master-slave), load balance [see wiki Replication]
- Future Features
- Distributed
PHP client API example
<?php
require_once('SSDB.php');
$ssdb = new SimpleSSDB('127.0.0.1', 8888);
$resp = $ssdb->set('key', '123');
$resp = $ssdb->get('key');
echo $resp; // output: 123Performance
Typical performance
Total 1000 requests.
writeseq : 0.546 ms/op 178.7 MB/s
writerand : 0.519 ms/op 188.1 MB/s
readseq : 0.304 ms/op 321.6 MB/s
readrand : 0.310 ms/op 315.0 MB/s
SSDB vs Redis
View full SSDB vs Redis benchmark charts...
Concurrency benchmark
======= set =======
qps: 31852, time: 0.031 s
======= get =======
qps: 29103, time: 0.034 s
======= del =======
qps: 33042, time: 0.030 s
======= scan =======
qps: 25871, time: 0.039 s
======= rscan =======
qps: 31181, time: 0.032 s
======= zset =======
qps: 24352, time: 0.041 s
======= zget =======
qps: 27836, time: 0.036 s
======= zscan =======
qps: 10442, time: 0.096 s
======= zrscan =======
qps: 28224, time: 0.035 s
======= zdel =======
qps: 27137, time: 0.037 s
======= hset =======
qps: 31507, time: 0.032 s
======= hget =======
qps: 28388, time: 0.035 s
======= hscan =======
qps: 25319, time: 0.039 s
======= hrscan =======
qps: 30399, time: 0.033 s
======= hdel =======
qps: 29741, time: 0.034 s
See Benchmark
Compile and Install
$ make
# start master
$ ./ssdb-server ssdb.conf
# or start as daemon
$ ./ssdb-server -d ssdb.conf
# start slave
$ ./ssdb-server ssdb_slave.conf
# ssdb command line
$ ./tools/ssdb-cliWho's using SSDB?
See Users wiki
Links
- Author's homepage
- SSDB 中文文档
- Cpy Scripting Language
- Google LevelDB
- Lua ssdb client driver for the ngx_lua
- Yet another ssdb client for Python
Changes made to LevelDB
--- db/dbformat.h.bk 2013-05-02 10:24:46.000000000 +0800
+++ db/dbformat.h 2013-05-03 17:13:49.000000000 +0800
@@ -25,10 +25,10 @@ static const int kNumLevels = 7;
static const int kL0_CompactionTrigger = 4;
// Soft limit on number of level-0 files. We slow down writes at this point.
-static const int kL0_SlowdownWritesTrigger = 8;
+static const int kL0_SlowdownWritesTrigger = 16;
// Maximum number of level-0 files. We stop writes at this point.
-static const int kL0_StopWritesTrigger = 12;
+static const int kL0_StopWritesTrigger = 64;
--- db/version_set.cc.bk 2013-05-03 17:08:31.000000000 +0800
+++ db/version_set.cc 2013-05-03 15:04:02.000000000 +0800
@@ -20,7 +20,7 @@
-static const int kTargetFileSize = 2 * 1048576;
+static const int kTargetFileSize = 32 * 1048576;
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent