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https://issues.apache.org/jira/browse/HADOOP-16459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16892216#comment-16892216
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Erik Krogen commented on HADOOP-16459:
--------------------------------------
I've put up a branch-2 patch as well. It has two additional modifications from
the branch-3.0 patch:
* A lamba for {{GenericTestUtils.waitFor()}} is replaced with an anonymous
subclass
* The {{RpcScheduler}} interface can no longer have default methods, since
branch-2 uses Java 7. Unfortunately Java 7 has no way to emulate this behavior,
so if users have a custom {{RpcScheduler}} implementation, it will break with
this change. Our [compatibility
policy|https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/InterfaceClassification.html]
states that it is acceptable for us to make this breaking change in a minor
version release since this interface is marked as {{LimitedPrivate}} /
{{Evolving}}.
> Backport [HADOOP-16266] "Add more fine-grained processing time metrics to the
> RPC layer" to branch-2
> ----------------------------------------------------------------------------------------------------
>
> Key: HADOOP-16459
> URL: https://issues.apache.org/jira/browse/HADOOP-16459
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Priority: Major
> Attachments: HADOOP-16266-branch-2.000.patch,
> HADOOP-16266-branch-3.0.000.patch, HADOOP-16266-branch-3.1.000.patch,
> HADOOP-16266-branch-3.2.000.patch
>
>
> We would like to target pulling HADOOP-16266, an important operability
> enhancement and prerequisite for HDFS-14403, into branch-2.
> It's only present in trunk now so we also need to backport through the 3.x
> lines.
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