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https://issues.apache.org/jira/browse/HBASE-3657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu updated HBASE-3657:
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Attachment: hbase-3657.txt
Here is the patch
> reduce copying of HRegionInfo's
> -------------------------------
>
> Key: HBASE-3657
> URL: https://issues.apache.org/jira/browse/HBASE-3657
> Project: HBase
> Issue Type: Improvement
> Reporter: Ted Yu
> Assignee: Ted Yu
> Attachments: hbase-3657.txt
>
>
> I looked at calls to this method in AssignmentManager:
> public void assignUserRegions(List<HRegionInfo> regions, List<HServerInfo>
> servers)
> Here is one from AssignmentManager:
> assignUserRegions(Arrays.asList(regions.keySet().toArray(new
> HRegionInfo[0])), servers);
> Here is another from Master:
> this.assignmentManager.assignUserRegions(Arrays.asList(newRegions),
> servers);
> I propose changing the first parameter to HRegionInfo[] so that extra copying
> can be avoided - considering that the number of regions in production is high.
> A bigger task is to reduce memory footprint of AssignmentManager.
> It would eliminate this copy:
> 165 public static <T> List<T> asList(T... array) {
> 166 return new ArrayList<T>(array);
> 167 }
> 168
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