Jordan, It depends on the use case. Some use cases deal with 99% or more of static non-ephemeral nodes. And this is why the Exhibitor approach does not work for those use cases.
Regards, /Sergey On Fri, Jul 19, 2013 at 1:13 PM, Jordan Zimmerman < [email protected]> wrote: > I'm a bit late to this one but I don't understand the need for complete > backup of ZK data. In my experience, 99% of ZNodes are ephemeral. > Therefore, it would be wrong to restore those nodes. In a disaster, the > connection sessions would expire and you would not want ephemeral nodes > restored. This is why in Exhibitor I took the approach of selective restore. > > -Jordan > > On Jul 19, 2013, at 11:00 AM, jack ma <[email protected]> wrote: > > > I asked those question in the thread > > > http://mail-archives.apache.org/mod_mbox/zookeeper-user/201307.mbox/%3cCAB+cfdwhOV0JfB04=MpO_+i-4ou=VbL=eg2xs557+j+698j...@mail.gmail.com%3e > , > > but there is no response for that. > > > > So I posted those questions again here, hopefully I could get helps > > from the community. > > > > I want to make sure I am fully understanding the procedures of zookeeper > > backup and disaster recovery: > > > > For the backup procedures at zookeeper assemble: > > (1) Login to any host which state is "Serving" > > Question: > > Do I have to login to leader node, or any node is ok? > > (2) Copy latest snapshot file and transaction log from version-2 > directory. > > Question: > > How to make sure we do not copy corrupt files if the > > snapshot/transaction log is in the middle of update? Do we have to > shutdown > > the node to make the copy? > > besides the transaction log and snapshot, do we have to > > copy other files such as the ecoch files > > > > For the disaster recovery procedures at zookeeper assemble: > > (1) recreate the machines for the zookeeper ensemble > > (2) copy snapshot/transaction log we backed up into the zookeeper > > dataDir\version-2 and logDir\version2. > > Question: > > Do we have to copy the epoch files? > > Do we have to copy snapshot/transaction log backed up to > > all the zookeeper node, or just the first node we starts? > > > > Appreciate your time and help. > > Jack > >
