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Zookeeper >> mail # dev >> reverse name lookup?


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Marshall McMullen 2012-05-22, 04:31
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Re: reverse name lookup?
Are they able to elect a leader or not even that?

-Flavio

On May 22, 2012, at 6:31 AM, Marshall McMullen wrote:

> In our Linux environment, we're using IP addresses only for all our
> zookeeper servers. We've observed that without a functioning DNS server,
> zookeeper peers cannot communicate with one another. We have been able to
> work around this in the past by putting entries in /etc/hosts for all the
> zookeeper servers. With entries in /etc/hosts no reverse name lookup is
> performed and everything works fine.
>
> Has anyone else seen this behavior or can confirm/deny whether zookeeper
> requires (assumes) a functioning DNS server.. ?
>
> I've gone through a lot of the quorum code related to IP addresses, and I
> thought the culprit might be calls to InetAddress.getByName. But looking at
> the source code for that (at least in openjdk) they return if the given
> string is an actual IP address. Other thoughts I had were calls to
> InetSocketAddress(hostname, port), but that looks like it similarly goes
> through InetAddress so that should be OK.
>
> Anyhow, I'll keep digging into this, but any ideas or help would be
> appreciated!
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Marshall McMullen 2012-05-23, 15:02
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Marshall McMullen 2012-05-23, 15:09
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB