[HAMA-761] Improvement for GraphJobMessage comparation operation

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.6.1
• Fix Version/s: 0.6.2
• Component/s: graph
• Assignee: MaoYuan Xian
• Reporter: MaoYuan Xian
• Created: 08/Jun/13 16:38
• Updated: 14/Jun/13 23:08
• Resolved: 14/Jun/13 07:08

Description

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.