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https://issues.apache.org/jira/browse/HADOOP-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko updated HADOOP-2185:
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Attachment: (was: FixedPorts.patch)
> Server ports: to roll or not to roll.
> -------------------------------------
>
> Key: HADOOP-2185
> URL: https://issues.apache.org/jira/browse/HADOOP-2185
> Project: Hadoop
> Issue Type: Improvement
> Components: conf, dfs, mapred
> Affects Versions: 0.15.0
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Fix For: 0.16.0
>
> Attachments: FixedPorts2.patch, FixedPorts3.patch, port.stack
>
>
> Looked at the issues related to port rolling. My impression is that port
> rolling is required only for the unit tests to run.
> Even the name-node port should roll there, which we don't have now, in order
> to be able to start 2 cluster for testing say dist cp.
> For real clusters on the contrary port rolling is not desired and some times
> even prohibited.
> So we should have a way of to ban port rolling. My proposition is to
> # use ephemeral port 0 if port rolling is desired
> # if a specific port is specified then port rolling should not happen at all,
> meaning that a
> server is either able or not able to start on that particular port.
> The desired port is specified via configuration parameters.
> - Name-node: fs.default.name = host:port
> - Data-node: dfs.datanode.port
> - Job-tracker: mapred.job.tracker = host:port
> - Task-tracker: mapred.task.tracker.report.bindAddress = host
> Task-tracker currently does not have an option to specify port, it always
> uses the ephemeral port 0,
> and therefore I propose to add one.
> - Secondary node does not need a port to listen on.
> For info servers we have two sets of config variables *.info.bindAddress and
> *.info.port
> except for the task tracker, which calls them *.http.bindAddress and
> *.http.port instead of "info".
> With respect to the info servers I propose to completely eliminate the port
> parameters, and form
> *.info.bindAddress = host:port
> Info servers should do the same thing, namely start or fail on the specified
> port if it is not 0,
> and start on any free port if it is ephemeral.
> For the task-tracker I would rename tasktracker.http.bindAddress to
> mapred.task.tracker.info.bindAddress
> For the data-node the info dfs.datanode.info.bindAddress should be included
> into the default config.
> Is there a reason why it is not there?
> This is the summary of proposed changes:
> || Server || current name = value || proposed name = value ||
> | NameNode | fs.default.name = host:port | same |
> | | dfs.info.bindAddress = host | dfs.http.bindAddress = host:port |
> | DataNode | dfs.datanode.bindAddress = host | dfs.datanode.bindAddress =
> host:port |
> | | dfs.datanode.port = port | eliminate |
> | | dfs.datanode.info.bindAddress = host | dfs.datanode.http.bindAddress =
> host:port |
> | | dfs.datanode.info.port = port | eliminate |
> | JobTracker | mapred.job.tracker = host:port | same |
> | | mapred.job.tracker.info.bindAddress = host |
> mapred.job.tracker.http.bindAddress = host:port |
> | | mapred.job.tracker.info.port = port | eliminate |
> | TaskTracker | mapred.task.tracker.report.bindAddress = host |
> mapred.task.tracker.report.bindAddress = host:port |
> | | tasktracker.http.bindAddress = host |
> mapred.task.tracker.http.bindAddress = host:port |
> | | tasktracker.http.port = port | eliminate |
> | SecondaryNameNode | dfs.secondary.info.bindAddress = host |
> dfs.secondary.http.bindAddress = host:port |
> | | dfs.secondary.info.port = port | eliminate |
> Do we also want to set some uniform naming convention for the configuration
> variables?
> Like having hdfs instead of dfs, or info instead of http, or systematically
> using either datanode
> or data.node would make that look better in my opinion.
> So these are all +*api*+ changes. I would +*really*+ like some feedback on
> this, especially from
> people who deal with configuration issues on practice.
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