anchor.diff:          	lager:info("operation being stored: ~p", [DownstreamOp]),
           	OpsDict1=orddict:append(DownstreamOp#clocksi_payload.commit_time, DownstreamOp, OpsDict),
           	lager:info("materialiser_vnode: OpsDict= ~p",[OpsDict1]),
  -            true = ets:insert(OpsCache, {Key, OpsDict1}),
  +            true = ets:insert(OpsCache, {Key, ops_gc(OpsDict1)}),
               {reply, ok, State};
           {error, Reason} ->
               {reply, {error, Reason}, State}
  
positive.code:             		TxId = LastOp#clocksi_payload.txid,
  					{ok, Snapshot} = clocksi_materializer:update_snapshot(Type, LatestSnapshot, SnapshotTime, [H|T], TxId),
  					CommitTime = LastOp#clocksi_payload.commit_time,
  					lager:info("materialiser_vnode: caching new snapshot= ~p, snapshot committed with time:~p.", [Snapshot,CommitTime]),
  					ets:insert(SnapshotCache, {Key, orddict:store(CommitTime,Snapshot, SnapshotDict)})
  				end
              end
      end,
  	lager:info("materialiser_vnode: snapshot: ~p", [Snapshot]),
  	{reply, {ok, Snapshot}, State};
  
  handle_command({update, Key, DownstreamOp}, _Sender,
                 State = #state{ops_cache = OpsCache})->
  
negative.code: 
  -include("floppy.hrl").
  -include_lib("riak_core/include/riak_core_vnode.hrl").
  
  
  -define(SNAPSHOT_THRESHOLD, 10).
  -define(SNAPSHOT_MIN, 2).
  -define(OPS_THRESHOLD, 50).
  -define(OPS_MIN, 5).
  
  -export([start_vnode/1,
           read/3,
  