fork of https://github.com/rust-rocksdb/rust-rocksdb for nextgraph
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42 lines
1.7 KiB
42 lines
1.7 KiB
1 year ago
|
---
|
||
|
|
title: Reading RocksDB options from a file
|
||
|
|
layout: post
|
||
|
|
author: lgalanis
|
||
|
|
category: blog
|
||
|
|
redirect_from:
|
||
|
|
- /blog/1883/reading-rocksdb-options-from-a-file/
|
||
|
|
---
|
||
|
|
|
||
|
|
RocksDB options can be provided using a file or any string to RocksDB. The format is straightforward: `write_buffer_size=1024;max_write_buffer_number=2`. Any whitespace around `=` and `;` is OK. Moreover, options can be nested as necessary. For example `BlockBasedTableOptions` can be nested as follows: `write_buffer_size=1024; max_write_buffer_number=2; block_based_table_factory={block_size=4k};`. Similarly any white space around `{` or `}` is ok. Here is what it looks like in code:
|
||
|
|
|
||
|
|
<!--truncate-->
|
||
|
|
|
||
|
|
```c++
|
||
|
|
#include <string>
|
||
|
|
#include "rocksdb/db.h"
|
||
|
|
#include "rocksdb/table.h"
|
||
|
|
#include "rocksdb/utilities/convenience.h"
|
||
|
|
|
||
|
|
using namespace rocksdb;
|
||
|
|
|
||
|
|
int main(int argc, char** argv) {
|
||
|
|
DB *db;
|
||
|
|
|
||
|
|
Options opt;
|
||
|
|
|
||
|
|
std::string options_string =
|
||
|
|
"create_if_missing=true;max_open_files=1000;"
|
||
|
|
"block_based_table_factory={block_size=4096}";
|
||
|
|
|
||
|
|
Status s = GetDBOptionsFromString(opt, options_string, &opt);
|
||
|
|
|
||
|
|
s = DB::Open(opt, "/tmp/mydb_rocks", &db);
|
||
|
|
|
||
|
|
// use db
|
||
|
|
|
||
|
|
delete db;
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
Using `GetDBOptionsFromString` is a convenient way of changing options for your RocksDB application without needing to resort to recompilation or tedious command line parsing.
|