"Execution.unregisterSegmentRequests",
"cleaning up segment registrations");
final SegmentCacheManager mgr =
locus.getServer()
.getAggregationManager().cacheMgr;
mgr.execute(
new SegmentCacheManager.Command<Void>() {
public Void call() throws Exception {
mgr.getIndexRegistry()
.cancelExecutionSegments(Execution.this);
return null;