export stats_persist_period_sec (#7168)

Summary:
fixed
 - https://github.com/rust-rocksdb/rust-rocksdb/issues/447
 -  https://github.com/rust-rocksdb/rust-rocksdb/pull/448

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7168

Reviewed By: cheng-chang

Differential Revision: D22736013

Pulled By: ajkr

fbshipit-source-id: fdd784aa75d26a367b9108b05ffdd94a2ae117d3

db/c.cc

@@ -2720,6 +2720,16 @@ unsigned int rocksdb_options_get_stats_dump_period_sec(rocksdb_options_t* opt) {
   return opt->rep.stats_dump_period_sec;
 }
 
+void rocksdb_options_set_stats_persist_period_sec(rocksdb_options_t* opt,
+                                                  unsigned int v) {
+  opt->rep.stats_persist_period_sec = v;
+}
+
+unsigned int rocksdb_options_get_stats_persist_period_sec(
+    rocksdb_options_t* opt) {
+  return opt->rep.stats_persist_period_sec;
+}
+
 void rocksdb_options_set_advise_random_on_open(
     rocksdb_options_t* opt, unsigned char v) {
   opt->rep.advise_random_on_open = v;

db/c_test.c

@@ -1672,6 +1672,9 @@ int main(int argc, char** argv) {
     rocksdb_options_set_stats_dump_period_sec(o, 18);
     CheckCondition(18 == rocksdb_options_get_stats_dump_period_sec(o));
 
+    rocksdb_options_set_stats_persist_period_sec(o, 5);
+    CheckCondition(5 == rocksdb_options_get_stats_persist_period_sec(o));
+
     rocksdb_options_set_advise_random_on_open(o, 1);
     CheckCondition(1 == rocksdb_options_get_advise_random_on_open(o));
 
@@ -1825,6 +1828,7 @@ int main(int argc, char** argv) {
     CheckCondition(1 == rocksdb_options_get_is_fd_close_on_exec(copy));
     CheckCondition(1 == rocksdb_options_get_skip_log_error_on_recovery(copy));
     CheckCondition(18 == rocksdb_options_get_stats_dump_period_sec(copy));
+    CheckCondition(5 == rocksdb_options_get_stats_persist_period_sec(copy));
     CheckCondition(1 == rocksdb_options_get_advise_random_on_open(copy));
     CheckCondition(3 ==
                    rocksdb_options_get_access_hint_on_compaction_start(copy));
@@ -2112,6 +2116,10 @@ int main(int argc, char** argv) {
     CheckCondition(218 == rocksdb_options_get_stats_dump_period_sec(copy));
     CheckCondition(18 == rocksdb_options_get_stats_dump_period_sec(o));
 
+    rocksdb_options_set_stats_persist_period_sec(copy, 600);
+    CheckCondition(600 == rocksdb_options_get_stats_persist_period_sec(copy));
+    CheckCondition(5 == rocksdb_options_get_stats_persist_period_sec(o));
+
     rocksdb_options_set_advise_random_on_open(copy, 0);
     CheckCondition(0 == rocksdb_options_get_advise_random_on_open(copy));
     CheckCondition(1 == rocksdb_options_get_advise_random_on_open(o));

include/rocksdb/c.h

@@ -1104,6 +1104,10 @@ extern ROCKSDB_LIBRARY_API void rocksdb_options_set_stats_dump_period_sec(
     rocksdb_options_t*, unsigned int);
 extern ROCKSDB_LIBRARY_API unsigned int
 rocksdb_options_get_stats_dump_period_sec(rocksdb_options_t*);
+extern ROCKSDB_LIBRARY_API void rocksdb_options_set_stats_persist_period_sec(
+    rocksdb_options_t*, unsigned int);
+extern ROCKSDB_LIBRARY_API unsigned int
+rocksdb_options_get_stats_persist_period_sec(rocksdb_options_t*);
 extern ROCKSDB_LIBRARY_API void rocksdb_options_set_advise_random_on_open(
     rocksdb_options_t*, unsigned char);
 extern ROCKSDB_LIBRARY_API unsigned char