1.7 KiB
1.7 KiB
title | layout | author | category | redirect_from | |
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Reading RocksDB options from a file | post | lgalanis | blog |
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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:
#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.