empiredan commented on code in PR #1035:
URL: https://github.com/apache/incubator-pegasus/pull/1035#discussion_r918516377
##########
rdsn/src/meta/meta_service.cpp:
##########
@@ -1306,5 +1306,15 @@ void
meta_service::on_set_max_replica_count(configuration_set_max_replica_count_
server_state::sStateHash);
}
+int32_t meta_service::mutation_2pc_min_replica_count(int32_t
app_max_replica_count) const
+{
+ dassert_f(app_max_replica_count > 0, "max_replica_count > 0");
+ if (_opts.mutation_2pc_min_replica_count > 0) { // >0 means use the user
config
+ return _opts.mutation_2pc_min_replica_count;
+ } else { // otherwise, the value based on the table max_replica_count
+ return app_max_replica_count <= 2 ? 1 : app_max_replica_count / 2 + 1;
+ }
+}
+
Review Comment:
I think we can encapsulate this logic into a function `int32_t
mutation_2pc_min_replica_count(int32_t 2pc_min_replica_count, int32_t
app_max_replica_count)`, and put in `rdsn/src/common/replication_common.h` ?
Therefore both functions can just be implemented like this:
```C++
int32_t meta_service::mutation_2pc_min_replica_count(int32_t
app_max_replica_count) const
{
return
mutation_2pc_min_replica_count(_opts.mutation_2pc_min_replica_count,
app_max_replica_count);
}
int32_t replica::mutation_2pc_min_replica_count() const
{
return
mutation_2pc_min_replica_count(_options->mutation_2pc_min_replica_count,
_app_info.max_replica_count);
}
```
##########
rdsn/src/meta/meta_service.cpp:
##########
@@ -1306,5 +1306,15 @@ void
meta_service::on_set_max_replica_count(configuration_set_max_replica_count_
server_state::sStateHash);
}
+int32_t meta_service::mutation_2pc_min_replica_count(int32_t
app_max_replica_count) const
+{
+ dassert_f(app_max_replica_count > 0, "max_replica_count > 0");
Review Comment:
dcheck_gt(app_max_replica_count, 0);
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