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https://issues.apache.org/jira/browse/ACCUMULO-2499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13946063#comment-13946063
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Al Krinker commented on ACCUMULO-2499:
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More details per [~elserj],
Start with http://en.wikipedia.org/wiki/Ephemeral_port
This is a pretty common convention (Jetty and InetSocketAddress are two good
examples in the Java realm). When requesting to bind a socket, the port that
you provide is typically used directly to state which port you want to bind to
on the interface.
When you provide '0' instead of some other valid port (e.g. 1-65535),
convention states that an ephemeral port will be chosen instead. This ephemeral
port is likely to be unique and not already bound. Thus, configuring ports to
use '0' instead of some explicit value, should, in most cases, work around any
issues of running multiple distinct Accumulo instances (or any other process
which tries to use the same default ports) on the same hardware.
> User manual should include list of default ports
> ------------------------------------------------
>
> Key: ACCUMULO-2499
> URL: https://issues.apache.org/jira/browse/ACCUMULO-2499
> Project: Accumulo
> Issue Type: Improvement
> Components: docs
> Affects Versions: 1.5.1, 1.6.0
> Reporter: Sean Busbey
> Assignee: Al Krinker
> Priority: Minor
> Labels: firewall, newbie
> Fix For: 1.5.2, 1.6.0
>
> Attachments: ACCUMULO-2499.patch.txt
>
>
> It would be good to provide a list of the default ports used by Accumulo, so
> that administrators who need to lock down network access have an easy list to
> crib from.
> From a mail thread, [~ecn] gave us a start
> {quote}
> Port numbers (for 1.5+)
> 4560 Accumulo monitor (for centralized log display)
> 9997 Tablet Server
> 9999 Master Server
> 12234 Accumulo Tracer
> 50091 Accumulo GC
> 50095 Accumulo HTTP monitor
> {quote}
> I'd say the [Administration ->
> Network|http://accumulo.apache.org/1.5/accumulo_user_manual.html#_network]
> section would be a good fit, but maybe it should just be an appendix?
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