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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Zookeeper hostname lookup
Date Tue, 08 Dec 2009 01:02:06 GMT

Actually what you're hitting isn't from the Zookeeper code but our
HBase wrapper that starts the ZK quorum peers. What we're doing is
that the peer needs an id when starting up and the way we make sure
it's different on every started node is that we just use the index of
the address in the hbase.zookeeper.quorum configuration. Maybe we
could check not just the default hostname...


On Mon, Dec 7, 2009 at 1:14 AM, Richard Dorman <richard@bengueladev.com> wrote:
> I'm trying to startup a quorum of Zookeeper servers in a cluster,
> however, Zookeeper is failing to start because it cannot find its
> hostname in the list of Zookeeper quorum servers.
> I know this problem is well documented on the WIKI, however, my
> situation is a little different. The allocation of a node to become a
> Zookeeper is done dynamically by a management service running else where
> on the cluster. This node then associates its IP with a hostname in the
> Zookeeper quorum list. The hostname is not the default hostname of the
> node. The node may associate its IP with multiple hostnames for each
> service that it is allocated.
> This causes a problem when Zookeeper starts. Zookeeper does a
> getdefaulthost which will return the nodes default hostname and not the
> associated hostname.
> So my questions are:
> 1. Is it possible to resolve this some other way? We are not running DNS
> (hostname associations are managed by our own services). We also cannot
> use the nodes ip address as the nodes are allocated dynamically.
> Dynamically updating the config files is also not practical.
> 2. Why does Zookeeper need to test whether its hostname is in the
> Zookeeper quorim list? Can this safely be disabled?
> Richard

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