private void lock(boolean useBackupLock) {
    if (useBackupLock) {
      getDiskStore().getBackupLock().lock();
    }
    lock.lock();
  }
Set of members that have been revoked.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indicate to the user a member has been revoked, rather is simply conflicting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