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https://issues.apache.org/jira/browse/S2GRAPH-66?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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DOYUNG YOON updated S2GRAPH-66:
-------------------------------
    Description: 
since {{Storage#toEdge}} is called lots of times(# of edges query traverse), I 
think it is worth to optimize futher.

based on profile, we can notice that List#toMap and List#++ on two list takes 
many cpu time on toEdge(actually {{IndexEdgeDeserializable#fromKeyValues}}).

we can avoid List#toMap and List#++ by using MapBuilder and give up functional 
style here. 

I think code looks ugly(maybe not), but we can remove unnecessary cpu usage. 

!https://cloud.githubusercontent.com/assets/1264825/14624064/2659ab3e-0612-11e6-9c94-37d866bcda93.jpg!


  was:
since {{Storage#toEdge}} is called lots of times(# of edges query traverse), I 
think it is worth to optimize futher.

based on profile, we can notice that List#toMap and List#++ on two list takes 
many cpu time on toEdge(actually {{IndexEdgeDeserializable#fromKeyValues}}).

we can avoid List#toMap and List#++ by using MapBuilder and give up functional 
style here. 

I think code looks ugly(maybe not), but we can remove unnecessary cpu usage. 





> Optimize toEdge, IndexEdgeDeserializable using mutable Map.
> -----------------------------------------------------------
>
>                 Key: S2GRAPH-66
>                 URL: https://issues.apache.org/jira/browse/S2GRAPH-66
>             Project: S2Graph
>          Issue Type: Improvement
>            Reporter: DOYUNG YOON
>            Assignee: DOYUNG YOON
>              Labels: serde, write
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> since {{Storage#toEdge}} is called lots of times(# of edges query traverse), 
> I think it is worth to optimize futher.
> based on profile, we can notice that List#toMap and List#++ on two list takes 
> many cpu time on toEdge(actually {{IndexEdgeDeserializable#fromKeyValues}}).
> we can avoid List#toMap and List#++ by using MapBuilder and give up 
> functional style here. 
> I think code looks ugly(maybe not), but we can remove unnecessary cpu usage. 
> !https://cloud.githubusercontent.com/assets/1264825/14624064/2659ab3e-0612-11e6-9c94-37d866bcda93.jpg!



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