}
final long tombstoneThreshold = _timeMaster.currentTimeMillis() - _tombstoneTTLMsecs;
_entryStore.iterateEntriesByModifiedTime(StoreOperationSource.CLEANUP, null,
0L, // earliest timestamp
new StorableLastModIterationCallback() {
@Override
public IterationAction verifyTimestamp(long timestamp) {
return IterationAction.PROCESS_ENTRY;
}