Hi, I have some question for you, starting from 
documentation: http://orientdb.com/docs/last/Distributed-Sharding.html 
and http://orientdb.com/docs/last/Distributed-Architecture.html

Auto-Sharding is not supported in the common meaning of Distributed Hash 
> Table (DHT). Selecting the right shard (cluster) is up to the application.
>

Do you mean that for each insertion of a record into a class, the client 
should also specify explicitly the cluster? What do you mean with 
Auto-Sharding more precisely?

 Not complete merging of results for all the projections. Some functions 
> like AVG() doesn’t work on map/reduce

Do you mean that some aggregators are not supported in distributed mode or 
simply that the aggregation should be executed client side? 

hotAlignment:true could bring the database status as inconsistent
>
Why? In which cases?

if hotAlignment=false is set, when a node re-joins the cluster (after a 
> failure or simply unreachability) the full copy of database from a node 
> could have no all information about the shards 

In which sense this could be a problem?

Thanks, I'm also doing a pull request to orientdb-docs to correct some 
typos.
Cheers,
   Riccardo 

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