In the case of an active leader, L continues to send commands
(whatever) to the followers. However a new leader L' has since been
elected and is also sending commands to the followers. In this case
it seems like either a) L should not send commands if it's not
sync'd to the ensemble (and ho
Kevin Burton wrote:
On Thu, Jan 8, 2009 at 3:21 PM, Benjamin Reed wrote:
InterruptedException is rather tricky because the semantics of
Thread.isInterrupted() is rather vague. specifically, it is unclear why
someone would interrupt a thread. usually Thread.interrupt() is used to shut
things
Kevin Burton wrote:
The ZooKeeper constructor only takes a host and port... not a list of
servers.
The second constructor documents the host parameter as follows:
@param host comma separated host:port pairs, each corresponding to a zk
server. eg. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002
Thanks for all the responses.
Benjamin Reed wrote:
Thomas,
in the scenario you give you have two simultaneous failures with 3 nodes, so it
will not recover correctly. A is failed because it is not up. B has failed
because it lost all its data.
it would be good for ZooKeeper to not come up in
Mahadev Konar wrote:
Hi Thomas,
Here is what would happen in the scenario you mentioned.
Great - thanks Mahadev.
Not to drag this on more than necessary, please bear with me for one
more example of 'amnesia' that comes to mind. I have a set of ZooKeeper
servers A, B, C.
- C is currently no
Mahadev Konar wrote:
Hi Thomas,
More generally, is it a safe assumption to make that the ZooKeeper
service will maintain all its guarantees if a minority of servers lose
persistent state (due to bad disks, etc) and restart at some point in
the future?
Yes that is true.
Great - t
g/hadoop-data/attachments/ZooKeeper(2f)ZooKeeperPresent
ations/attachments/zk-talk-upc.pdf
mahadev
On 12/16/08 9:45 AM, "Thomas Vinod Johnson" wrote:
What is the expected behavior if a server in a ZooKeeper service
restarts with all its prior state lost? Empirically, everything seems to
What is the expected behavior if a server in a ZooKeeper service
restarts with all its prior state lost? Empirically, everything seems to
work*. Is this something that one can count on, as part of ZooKeeper
design, or are there known conditions under which this could cause
problems, either liv
Hi,
I have a replicated zookeeper services consisting of 3 zookeeper (3.0.1)
servers all running on the same host for testing purposes. I've created
exactly one znode in this ensemble. At this point, I stop, then restart
a single zookeeper server; moving onto the next one a few seconds later.
