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https://issues.apache.org/jira/browse/ACCUMULO-1585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13775945#comment-13775945
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ASF subversion and git services commented on ACCUMULO-1585:
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Commit 3de0c1ec44d476fe1465eb05d33c32de3ccf1068 in branch refs/heads/master
from [~keith_turner]
[ https://git-wip-us.apache.org/repos/asf?p=accumulo.git;h=3de0c1e ]
ACCUMULO-1585 Replaced most InetSocketAddress usage with HostAndPort to avoid
DNS and reverse DNS lookups
> 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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