osd/osd_types: add PCT_UPDATE_DELAY pool option

Signed-off-by: Samuel Just <sjust@redhat.com>

2 files changed, 18 insertions, 1 deletions

diff --git a/src/osd/osd_types.cc b/src/osd/osd_types.cc
index b2e8d8f297a..5c2cf8b16b0 100644
--- a/src/osd/osd_types.cc
+++ b/src/osd/osd_types.cc
@@ -1378,7 +1378,9 @@ static opt_mapping_t opt_mapping = boost::assign::map_list_of
 	   ("pg_num_max", pool_opts_t::opt_desc_t(
              pool_opts_t::PG_NUM_MAX, pool_opts_t::INT))
 	   ("read_ratio", pool_opts_t::opt_desc_t(
-             pool_opts_t::READ_RATIO, pool_opts_t::INT));
+             pool_opts_t::READ_RATIO, pool_opts_t::INT))
+	   ("pct_update_delay", pool_opts_t::opt_desc_t(
+             pool_opts_t::PCT_UPDATE_DELAY, pool_opts_t::INT));
 
 bool pool_opts_t::is_opt_name(const std::string& name)
 {
diff --git a/src/osd/osd_types.h b/src/osd/osd_types.h
index f80adbbfd11..b6f5335a0f5 100644
--- a/src/osd/osd_types.h
+++ b/src/osd/osd_types.h
@@ -1107,6 +1107,21 @@ public:
     DEDUP_CDC_CHUNK_SIZE,
     PG_NUM_MAX, // max pg_num
     READ_RATIO, // read ration for the read balancer work [0-100]
+    /**
+     * PCT_UPDATE_DELAY
+     *
+     * Time to wait (seconds) after there are no in progress writes before
+     * updating pg_committed_to on replicas.  If the period between writes on
+     * a PG is usually longer than this value, most writes will trigger an
+     * extra message.
+     *
+     * The primary reason to enable this feature would be to limit the time
+     * between a write and when that write is available to be read on replicas.
+     *
+     * A value <= 0 will cause the update to be sent immediately upon write
+     * completion if there are no other in progress writes.
+     */
+    PCT_UPDATE_DELAY,
   };
 
   enum type_t {