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https://issues.apache.org/jira/browse/HAMA-761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13682175#comment-13682175
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MaoYuan Xian commented on HAMA-761:
-----------------------------------
Attached the patch. In the case of vertex value has large value, the
improvements will be obvious. I tested it in 84 machines cluster with 420
slots. (Ever tried to run from 300 machines with more than 1000 slots, but job
failed because of mysterious problem, I have not find out the reason...)
> Improvement for GraphJobMessage comparation operation
> -----------------------------------------------------
>
> Key: HAMA-761
> URL: https://issues.apache.org/jira/browse/HAMA-761
> Project: Hama
> Issue Type: Improvement
> Components: graph
> Affects Versions: 0.6.1
> Reporter: MaoYuan Xian
> Assignee: MaoYuan Xian
> Attachments: HAMA-761.patch
>
>
> Currently, GraphJobMessage comparation opertion depends on the default
> comparator (org.apache.hadoop.io.WritableComparator used), which has to read
> out all GraphJobMessage message (including vertexId and vertexValue) when
> does the comparation.
> Since lots of comparation operations happen in graph computing, this
> limitation makes a performance downgrade.
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