Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 41 insertions, 0 deletions

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
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+---
+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.