Claudio Martella commented on GIRAPH-126:

Avery is right, EMPTY_LIST is Immutable. This means it will throw 
> Use Collections.emptyList() in BasicRPCCommunications.java
> ----------------------------------------------------------
>                 Key: GIRAPH-126
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-126
>             Project: Giraph
>          Issue Type: Improvement
>            Reporter: André Kelpe
>            Assignee: André Kelpe
>            Priority: Minor
>         Attachments: GIRAPH-126.patch, GIRAPH-126.patch, GIRAPH-126.patch
> I am doing some tests with giraph and I am having some memory problems. While 
> I was browsing through the codebase I saw that you are allocating a new 
> ArrayList (which has an underlying array of 10 elements) for each Vertex, 
> that has no Messages to be delivered. That's a waste of memory and time. This 
> patch replaces it with the EMPTY_LIST of the Collections utility class.

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