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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5622) add a Pingable interface with a Ping() method for checking the health of things
Date Fri, 03 Apr 2009 11:48:12 GMT
add a Pingable interface with a Ping() method for checking the health of things
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                 Key: HADOOP-5622
                 URL: https://issues.apache.org/jira/browse/HADOOP-5622
             Project: Hadoop Core
          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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