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https://issues.apache.org/jira/browse/ACCUMULO-1585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13772567#comment-13772567
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Keith Turner commented on ACCUMULO-1585:
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While working on ACCUMULO-1152 I ran into an issue with this. I was trying to
check the tserver lock in the tablet location cache, but was unable to because
the metadata table had IP addrs and zookeeper contained hostnames. Seems like
the locations in the metadata table should exactly match what is advertised in
zookeeper.
> Provide option for FQDN/verbatim data from config files of servers to be
> stored in ZooKeeper rather than resolved IP
> --------------------------------------------------------------------------------------------------------------------
>
> Key: ACCUMULO-1585
> URL: https://issues.apache.org/jira/browse/ACCUMULO-1585
> Project: Accumulo
> Issue Type: Improvement
> Components: tserver
> Environment: All
> Reporter: Basit Mustafa
> Assignee: Eric Newton
> Priority: Minor
> Fix For: 1.6.0
>
> Original Estimate: 12h
> Remaining Estimate: 12h
>
> There are some situations (esp in virtualized/cloud environments) where
> "hardwiring" the IP into ZooKeeper can create reachability issues and an FQDN
> (or, better/also, the verbatim string/line from the concerned config file)
> would fix this problem.
> For example, hostname node1.company.com specified in configuration files
> resolves to an Amazon EC2 *internal* IP of 10.2.3.4 (internal on virtualized
> network). Externally (e.g. from your dev machine, your
> offsite/non-VPN/non-VPCed data center, other client machines on different
> networks/clouds), node1.company.com will resolve to a public IP (e.g. Amazon
> Elastic IP, etc) of something more routeable, like 54.55.56.57.
> Accumulo currently stores 10.2.3.4 in ZooKeeper based on this resolution,
> but, if you try to connect to Accumulo from outside these machines/machines
> in the same cloud/vitualized network/non routeable network, and the same FQDN
> (node1.company.com) resolves to the public address now (54.55.56.57), you
> will not be able to connect, because the Accumulo client will have pulled the
> resolved, and from here, unreachable, IP of 10.2.3.4.
> Using the FQDN (or in some other way allowing for client-side name
> resolution/address translation, although this seems kludgy) would fix this
> issue in a relatively standard way. Ideally, this would not incur a
> performance issue beyond the first resolution assuming the TCP/IP stack is
> doing its job and caching stuff effectively (I assume).
> This doesn't really hurt/break things if you give an option in some config,
> and, really, taking the literal from the file allows you to use whatever you
> want, the ultimate in flexibility.
> See discussion
> http://mail-archives.apache.org/mod_mbox/accumulo-user/201307.mbox/%3CCAGFNOZTMVz0R2e0meDj%3DKqPPPJP6f5baaMqh8%3D07V7NZ8vToJg%40mail.gmail.com%3E
> for more details and others having the same issue.
> I will look into creating a patch for this as soon as I have some time to
> find/look at relevant code portions (I need to find where accumulo is making
> these writes to ZK and if the read FQDNs would need any resolution/their use
> further down the line expects strictly IP or is in host or IP safe API calls,
> etc). Any suggestions on where I can begin this are always appreciated.
> Otherwise, I'll try and submit a patch when I can.
> Figure I'd open this issue to at least provide a discussion on what more
> experienced Accumulo devs and users think and what a solution based on the
> style/patterns accepted for Accumulo development/configuration are. I can
> read the guidelines myself, of course, and will, but someone suggested
> opening an issue, so I am...
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