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https://issues.apache.org/jira/browse/HADOOP-7742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461073#comment-13461073
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Harsh J commented on HADOOP-7742:
---------------------------------
Hi Luke,
So this is an "incompatible change" now? What would we need to do to help
projects such as HBase at this time?
> Evolve metrics2 in 0.23 and trunk to allow coexistence with 0.20-security
> releases
> ----------------------------------------------------------------------------------
>
> 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
> Labels: metrics
>
> 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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