Bring 2.0 bug fixes to 2.2 #901
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… the same lastmod
If we call riak_core_vnode_master:sync_spawn_command, it ends up sending a gen_event all-state event to the proxy for forwarding. However, in handle_overload, the old code only had case clauses for '$gen_event' and not '$gen_all_state_event'. This means the event would be passed to handle_overload_info instead of handle_overload_request, which would likely skip the vnode callback code that sends a response. In Riak this meant that certain operations would hang during overload, since the caller to sync_spawn_command would never be sent a response. (This situation was made worse by the fact that the call is being done with an infinity timeout, but that's an issue we'll have to address some other time.)
There have been a few issues where rapidly updating the ring results in sub optimal behavior. These have been difficult to debug due to the lack of logging in the `riak_core_ring` module. We’ve added debug logging which can be enabled as needed to log ring metadata merges(buckets, real, etc) and ring membership and resulting rings from a reconciliation. For 2.2.1, we should add a new lager sink just for logging ring operations.
…orrectly named dropped_vnode_requests_total, which is the stats projection
Fix RIAK-2169 by fixing stat name `dropped_vnode_requests`
Fix RIAK-2643 by adding debug logging for meta and ring
Fix potential hang due to vnode proxy overload bug [JIRA: RIAK-3124]
add nodenames to the merge_meta comparison
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