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https://issues.apache.org/jira/browse/HADOOP-5622?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-5622.
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Resolution: Won't Fix
closing as a wontfix, unless it goes into the new yarn service interface
> add a Pingable interface with a Ping() method for checking the health of
> things
> -------------------------------------------------------------------------------
>
> Key: HADOOP-5622
> URL: https://issues.apache.org/jira/browse/HADOOP-5622
> Project: Hadoop Common
> Issue Type: Improvement
> Components: util
> Affects Versions: 0.21.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
>
> I'm filing this as part of the plan for getting HADOOP-3628 checked in:
> separate Ping() from everything else so that it can go in later/separately,
> and apply to more bits of the code than just the node root threads . The
> various helper classes that they use underneath could be marked as Pingable
> so that the health check operations could move the workload down.
> Use cases
> # Pingable Filesystem and MapReduce services: namenode, datanode,
> job-tracker, task-tracker, etc
> # Eventually : Pingable pig/cascading,HBase services
> # Implementation of the ping operation in the services by calling their
> in-JVM classes and aggregating the results
> # in JVM-health checks (JMX operations etc)
> # Over RMI/REST Smartfrog health checks (my use case)
> # Thrift and other wire format health checks
> # Public HTTP checks that return an error code with XML or JSON output.
> # Command line tools (that could check the HTTP pages)
> # Make it easy to test
> The current HADOOP-3628 ping() operation includes the service state from the
> proposed service lifecycle, and a list of nested exceptions; it only works in
> -VM. To work in more use cases
> # It needs to move to a serialized exception format - the ThrowableWritable
> of HADOOP-5348.
> # We need to consider how best to return the far-end's state.
> I'm going offline for two weeks; here is somewhere for people to add their
> thoughts and work for me when I get back.
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