Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/68#discussion_r52678587
--- 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 --
> We could change the interface method name to "migrationsSnapshot()" to be
clear, though, and to avoid careless future impl changes which change that
semantics.
:+1: I like this general approach. I think migrations are just one place
that we follow this pattern and could benefit from more descriptive method
names.
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