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
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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