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https://issues.apache.org/jira/browse/MAPREDUCE-5184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13677654#comment-13677654
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Sandy Ryza commented on MAPREDUCE-5184:
---------------------------------------
Thanks, [~zjshen], a few more nitpicks:
{code}
+ no major surgery has been conducted on it. Therefore, MRv2 is able to ensure
+ satisfactory compatibility to MRv1 applications. However, due to some
{code}
Should be: "satisfactory compatibility *with* MRv1 applications"
{code}
+ <<mapred>> APIs. This means that applications which were compiled with MRv1
+ <<mapred>> APIs can run directly on YARN without recompilation.
{code}
Should be "This means that applications which were *built against* MRv1
<<mapred>> APIs"
{code}
+ We cannot ensure complete binary compatibility to the applications that use
{code}
Should be: "binary compatibility *to* the applications"
{code}
+ compatibility. Users are suggested to recompile their applications against
+ MRv2 <<mapreduce>> APIs. One important binary incompatibility break is
{code}
Should be: "Users *should* recompile their applications that *use <<mapreduce>>
APIs against MRv2 jars*"
{code}
+ Counter and CounterGroup, Users are recommended to recompile their
+ applications if they used the two interfaces. On the other hand,
<<mapreduce>>
{code}
Probably don't need to recommend a recompile twice.
{code}
+ neither support binary compatibility nor source compatibility to the
+ applications that use this class directly.
{code}
Should be: "compatibility *for* the applications*
{code}
+ Unfortunately, maintaining binary compatibility of <<mapred>> APIs for MRv1
+ applications may lead to binary incompatibility issues for early MRv2
{code}
Should be: "maintaining binary compatibility *with* <<mapred>>"
{code}
+ please note that <<<hadoop -jar hadoop-examples-1.x.x.jar>>> is still using
{code}
Should be: "*will* still use"
> Document MR Binary Compatibility vis-a-vis hadoop-1 and hadoop-2
> ----------------------------------------------------------------
>
> Key: MAPREDUCE-5184
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5184
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: documentation
> Reporter: Arun C Murthy
> Assignee: Zhijie Shen
> Fix For: 2.1.0-beta
>
> Attachments: MAPREDUCE-5184.1.patch, MAPREDUCE-5184.2.patch
>
>
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