Add comments on existing approach #172

plugins/db_plugin/db_plugin.cpp

@@ -406,7 +406,7 @@ void db_plugin_impl::_process_irreversible_block(const signed_block& block)
    ++processed;
 }
 
-
+// For now providing some simple account processing to maintain eos_balance
 void db_plugin_impl::update_account(const chain::Message& msg) {
    using bsoncxx::builder::basic::kvp;
    using bsoncxx::builder::stream::document;

plugins/db_plugin/include/eos/db_plugin/db_plugin.hpp

@@ -20,6 +20,14 @@ using db_plugin_impl_ptr = std::shared_ptr<class db_plugin_impl>;
  *   Accounts
  *
  *   See data dictionary (DB Schema Definition - EOS API) for description of MongoDB schema.
+ *
+ *   The goal ultimately is for all chainbase data to be mirrored in MongoDB via a delayed node processing
+ *   irreversible blocks. Currently, only Blocks, Transactions, Messages, and Account balance it mirrored.
+ *   Chainbase is being rewritten to be multi-threaded. Once chainbase is stable, integration directly with
+ *   a mirror database approach can be followed removing the need for the direct processing of Blocks employed
+ *   with this implementation.
+ *
+ *   If MongoDB env not available (#ifndef MONGODB) this plugin is a no-op.
  */
 class db_plugin : public plugin<db_plugin> {
 public: