DiskRegion createDiskRegion(DiskStoreImpl dsi, String name, boolean isBucket,
      boolean isPersistBackup, boolean overflowEnabled, boolean isSynchronous,
      DiskRegionStats stats, CancelCriterion cancel, DiskExceptionHandler exceptionHandler,
      RegionAttributes<?, ?> ra, EnumSet<DiskRegionFlag> flags, String partitionName,
      int startingBucketId, Compressor compressor, boolean offHeap) {
    lock(true);
    try {
      // need to call the constructor and addDiskRegion while synced
      DiskRegion result = new DiskRegion(dsi, name, isBucket, isPersistBackup, overflowEnabled,
          isSynchronous, stats, cancel, exceptionHandler, ra, flags, partitionName,
          startingBucketId, compressor == null ? null : compressor.getClass().getName(), offHeap);
      dsi.addDiskRegion(result);
      return result;
    } finally {
      unlock(true);
    }
  }
Set of members that have been revoked.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indicate to the user a member has been revoked, rather is simply conflicting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