Hi Nicolas, Thanks for your explanation. I know HBase uses ZeeKeeper as coordinated service but not a lock management service like Chubby. Like HBASE-5541 states, it seems the RegionServer controls the whole write process including providing row lock, region lock etc.. So I wonder why we don't use high available service like ZooKeeper creating, managing and releasing lock?
Brady On Mon, Apr 8, 2013 at 11:13 PM, Nicolas Liochon <nkey...@gmail.com> wrote: > Hi, > > 1. Yes. Client applications can start/read/write even when there is no > master. > 2. HBase already uses ZooKeeper. > > You may want to have to look at the hbase reference guide ( > http://hbase.apache.org/book.html). > > Nicolas > > > On Mon, Apr 8, 2013 at 4:39 PM, Brady Zhong <bradyzhong2...@gmail.com > >wrote: > > > Hi all, > > > > My name is Brady Zhong, a college student using HBase to develop our own > > project. Currently I confronted with a problem. Since we need some kind > of > > high availability, we hope HBase can keep available even though the > HMaster > > goes down. Here're my questions: > > > > 1. Can HBase work during the node failure of HMaster? Can users write or > > read the database before the switch and recovery of HMaster? > > 2. Why not use Zookeeper as distributed lock service for HBase, like > Chubby > > for Google Big Table? > > > > Thanks very much for any help in advance. > > > > > > Best regards, > > Brady Zhong > > >
