@Override
  public CompletableFuture<List<SnapshotDescription>> listTableSnapshots(Pattern tableNamePattern) {
    Preconditions.checkNotNull(tableNamePattern, "tableNamePattern is null."
      + " If you don't specify a tableNamePattern, use listSnapshots() instead");
    return getCompletedSnapshots(tableNamePattern, null);
  }
Compact the region at specific region server.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/RawAsyncHBaseAdmin.java