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| -rw-r--r-- | src/rocksdb/docs/_posts/2015-02-24-reading-rocksdb-options-from-a-file.markdown | 41 |
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diff --git a/src/rocksdb/docs/_posts/2015-02-24-reading-rocksdb-options-from-a-file.markdown b/src/rocksdb/docs/_posts/2015-02-24-reading-rocksdb-options-from-a-file.markdown new file mode 100644 index 00000000..cddc0dd0 --- /dev/null +++ b/src/rocksdb/docs/_posts/2015-02-24-reading-rocksdb-options-from-a-file.markdown @@ -0,0 +1,41 @@ +--- +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. |