private void recoverDiskRegion(long drId, String regName) {
    // Whatever the last create region drId we see we remember
    // in the DiskStore. Note that this could be a region that is destroyed
    // (we will not know until we see a later destroy region record)
    // but since drId's can wrap around into negative numbers whatever
    // the last one we see is the right one to remember.
    parent.recoverRegionId(drId);
    PlaceHolderDiskRegion dr = new PlaceHolderDiskRegion(parent, drId, regName);
    Object old = drMap.put(drId, dr);
    assert old == null;
    PlaceHolderDiskRegion oldDr = drMapByName.put(regName, dr);
    if (oldDr != null) {
      drMap.remove(oldDr.getId()); // fix for bug 42043
    }
    // don't schedule for recovery until we know it was not destroyed
  }
Set of members that have been revoked. We keep track of the revoked members so that we can
indicate to the user a member has been revoked, rather is simply conflicting
geode-core/src/main/java/org/apache/geode/internal/cache/DiskInitFile.java