SERVER-18216 Add term to oplog.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/mongo/db/repl/repl_client_info.h b/src/mongo/db/repl/repl_client_info.h
index 640e52dd7e6..69694f2795d 100644
--- a/src/mongo/db/repl/repl_client_info.h
+++ b/src/mongo/db/repl/repl_client_info.h
@@ -50,9 +50,22 @@ namespace repl {
         void setRemoteID(OID rid) { _remoteId = rid; }
         OID getRemoteID() const { return _remoteId; }
 
+        // If we haven't cached a term from replication coordinator, get the current term
+        // and cache it during the life cycle of this client.
+        //
+        // Used by logOp() to attach the current term to each log entries. Assume we don't change
+        // the term since caching it. This is true for write commands, since we acquire the
+        // global lock (IX) for write commands and stepping down also needs that lock (S).
+        // Stepping down will kill all user operations, so there is no write after stepping down
+        // in the case of yielding.
+        long long getTerm();
+
     private:
+        static const long long kUninitializedTerm = -1;
+
         OpTime _lastOp = OpTime();
         OID _remoteId = OID();
+        long long _cachedTerm = kUninitializedTerm;
     };
 
 }  // namespace repl