> do u mean if ZooKeeper is dead,the data will lose? If your Zookeeper ensemble is dead, then HBase will be unavailable but you won't lose any data. And even if your zookeeper data is wiped out, like I said it's only runtime data so it doesn't matter.
> > in that case,ZooKeeper lost .META or .ROOT ,the data in hadoop will never be > recover , thought there were some table folders in hadoop. HBase stores the location of -ROOT- in Zookeeper, and that's changed everytime the region moves. Losing that won't make -ROOT- disappear forever, it's still in HDFS. Does it answer the question? (I'm not sure I fully understand you) J-D
