Sergey, Can you explain what happens with ephemeral nodes during snapshot and restore ?
Thanks, Alex On Fri, Jul 19, 2013 at 11:21 AM, Sergey Maslyakov <[email protected]> wrote: > 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 >> >>
