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https://issues.apache.org/jira/browse/HADOOP-3628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-3628:
-----------------------------------
Status: Open (was: Patch Available)
doesn't compile, need to include a patched RPC class
compile-mapred-classes:
[javac] Compiling 278 source files to
/home/slo/Java/Apache/hadoop-core/build/classes
[javac]
/home/slo/Java/Apache/hadoop-core/src/mapred/org/apache/hadoop/mapred/TaskTracker.java:578:
waitForProxy(java.lang.Class,long,java.net.InetSocketAddress,org.apache.hadoop.conf.Configuration,long)
is not public in org.apache.hadoop.ipc.RPC; cannot be accessed from outside
package
[javac] RPC.waitForProxy(InterTrackerProtocol.class,
[javac] ^
[javac] Note: Some input files use or override a deprecated API.
[javac] Note: Recompile with -Xlint:deprecation for details.
[javac] 1 error
> Add a lifecycle interface for Hadoop components: namenodes, job clients, etc.
> -----------------------------------------------------------------------------
>
> Key: HADOOP-3628
> URL: https://issues.apache.org/jira/browse/HADOOP-3628
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs, mapred
> Affects Versions: 0.20.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Fix For: 0.21.0
>
> Attachments: AbstractHadoopComponent.java, hadoop-3628.patch,
> hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch,
> hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch,
> hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch,
> hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch,
> hadoop-lifecycle-tomw.sxw, hadoop-lifecycle.pdf, hadoop-lifecycle.sxw
>
>
> I'd like to propose we have a standard interface for hadoop components, the
> things that get started or stopped when you bring up a namenode. currently,
> some of these classes have a stop() or shutdown() method, with no standard
> name/interface, but no way of seeing if they are live, checking their health
> of shutting them down reliably. Indeed, there is a tendency for the spawned
> threads to not want to die; to require the entire process to be killed to
> stop the workers.
> Having a standard interface would make it easier for
> * management tools to manage the different things
> * monitoring the state of things
> * subclassing
> The latter is interesting as right now TaskTracker and JobTracker start up
> threads in their constructor; that's very dangerous as subclasses may have
> their methods called before they are full initialised. Adding this interface
> would be the right time to clean up the startup process so that subclassing
> is less risky.
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