Github user keith-turner commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/68#discussion_r52667397
--- Diff:
server/master/src/main/java/org/apache/accumulo/master/Master.java ---
@@ -1336,7 +1332,11 @@ public void assignedTablet(KeyExtent extent) {
}
@Override
- public Collection<KeyExtent> migrations() {
- return migrations.keySet();
+ public Set<KeyExtent> migrations() {
+ Set<KeyExtent> migrationsCopy = new HashSet<KeyExtent>();
+ synchronized (migrations) {
+ migrationsCopy.addAll(migrations.keySet());
+ }
+ return migrationsCopy;
--- End diff --
could return an immutable set
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