@Override
  public synchronized String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("{ meta => ");
    sb.append((metaEntry != null) ? metaEntry.hri.getRegionNameAsString() : "null");
    sb.append(", hdfs => " + getHdfsRegionDir());
    sb.append(", deployed => " + Joiner.on(", ").join(deployedEntries));
    sb.append(", replicaId => " + getReplicaId());
    sb.append(" }");
    return sb.toString();
  }
Maintain information about a particular region. It gathers information from three places -- HDFS,
META, and region servers.
hbase-server/src/main/java/org/apache/hadoop/hbase/util/HbckRegionInfo.java