@Override
    public long clear(RegionVersionVector rvv) {
      synchronized (liveEntries) {
        return liveEntries.clear(rvv, pendingKrfTags);
      }
    }
A map of DiskEntry to the VersionTag that is written to disk associated with this tag. Only
needed for async regions so that we can generate a krf with a version tag that matches the
the tag we have written to disk for this oplog.
geode-core/src/main/java/org/apache/geode/internal/cache/Oplog.java