private void destroyOldTomstones(final DiskRecoveryStore drs) {
    // iterate over all region entries in drs
    drs.foreachRegionEntry(regionEntry -> {
      DiskEntry de = (DiskEntry) regionEntry;
      synchronized (de) {
        DiskId id = de.getDiskId();
        if (id != null && regionEntry.isTombstone()) {
          VersionStamp stamp = regionEntry.getVersionStamp();
          if (getRegionVersionVector().isTombstoneTooOld(stamp.getMemberID(),
              stamp.getRegionVersion())) {
            drs.destroyRecoveredEntry(de.getKey());
          }
        }
      }
    });

  }
Initializes the contents of the region that owns this disk region. Currently the only time this
method does any work is when backup is true and recovery data was discovered when this disk
region was created.
geode-core/src/main/java/org/apache/geode/internal/cache/DiskRegion.java