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From "Luke Lu (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7742) Evolve metrics2 in 0.23 and trunk to allow coexistence with 0.20-security releases
Date Thu, 13 Oct 2011 18:21:11 GMT
Evolve metrics2 in 0.23 and trunk to allow coexistence with 0.20-security releases
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                 Key: HADOOP-7742
                 URL: https://issues.apache.org/jira/browse/HADOOP-7742
             Project: Hadoop Common
          Issue Type: Improvement
          Components: metrics
    Affects Versions: 0.23.0
            Reporter: Luke Lu
             Fix For: 0.23.0


HADOOP-7734 expressed the desire to support downstream projects that depends on both 0.23+
and 0.20-security releases.

In order to achieve that we need to evolve the 0.23/trunk API a little to avoid name conflicts:

# Rename AbstractMetric to ImmutableMetric, which also address a common question sink implementer
ask about thread safety.
# Rename MetricsRecord to ImmutableMetrics, ditto.
# Rename MetricsVisitor to MetricVisitor.

We better do it before 0.23 is released or, it will be an "incompatible" change.

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