e.org
Subject: Re: What happens when a server loses all its state?
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
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
recovery state.
Cheers
|-Original Message-
|From: Benjamin Reed [mailto:br...@yahoo-inc.com]
|Sent: Wednesday, December 17, 2008 11:48 AM
|To: zookeeper-user@hadoop.apache.org
|Subject: RE: What happens when a server loses all its state?
|
|Thomas,
|
|in the scenario you give you have
From: thomas.john...@sun.com [thomas.john...@sun.com]
Sent: Tuesday, December 16, 2008 4:02 PM
To: zookeeper-user@hadoop.apache.org
Subject: Re: What happens when a server loses all its state?
Mahadev Konar wrote:
> Hi Thomas,
>
>
>
>
>> More ge
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
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 not running, A is
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
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.
mahadev
>
> Thanks.
> Mahadev Konar
Sorry, I should have been a little more explicit. At this point, the
situation I'm considering is this; out of 3 servers, 1 server 'A'
forgets its persistent state (due to a bad disk, say) and it restarts.
My guess from what I could understand/reason about the internals was
that the server 'A'
Hi Thomas,
If a zookeeper server loses all state and their are enough servers in the
ensemble to continue a zookeeper service ( like 2 servers in the case of
ensemble of 3), then the server will get the latest snapshot from the leader
and continue.
The idea of zookeeper persisting its state on d
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
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