Index: src/main/java/org/apache/hadoop/hbase/regionserver/MemStoreFlusher.java =================================================================== --- src/main/java/org/apache/hadoop/hbase/regionserver/MemStoreFlusher.java (revision 1088818) +++ src/main/java/org/apache/hadoop/hbase/regionserver/MemStoreFlusher.java (working copy) @@ -23,10 +23,10 @@ import java.lang.management.ManagementFactory; import java.util.ConcurrentModificationException; import java.util.HashMap; +import java.util.HashSet; import java.util.Map; import java.util.Set; import java.util.SortedMap; -import java.util.TreeSet; import java.util.concurrent.BlockingQueue; import java.util.concurrent.DelayQueue; import java.util.concurrent.Delayed; @@ -151,7 +151,7 @@ SortedMap regionsBySize = server.getCopyOfOnlineRegionsSortedBySize(); - Set excludedRegions = new TreeSet(); + Set excludedRegions = new HashSet(); boolean flushedOne = false; while (!flushedOne) {