[ 
https://issues.apache.org/jira/browse/GIRAPH-126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13188608#comment-13188608
 ] 

Jakob Homan commented on GIRAPH-126:
------------------------------------

yeah, good catch:
{noformat}scala> list3.add(42)
java.lang.UnsupportedOperationException
        at java.util.AbstractList.add(AbstractList.java:131)
        at java.util.AbstractList.add(AbstractList.java:91)
        at .<init>(<console>:7)
        at .<clinit>(<console>)
        at RequestResult$.<init>(<console>:9)
        at RequestResult$.<clinit>(<console>)
        at RequestResult$scala_repl_result(<console>)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at 
scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1$$anonfun$apply$18.apply(Interpreter.scala:981)
        at 
scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1$$anonfun$apply$...
{noformat}
                
> 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: 
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira


Reply via email to