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From "Konstantin Shvachko (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7035) Document incompatible API changes between releases
Date Thu, 29 Sep 2011 23:39:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13117742#comment-13117742
] 

Konstantin Shvachko commented on HADOOP-7035:
---------------------------------------------

Sounds like a good approach to me. I see SigTest does some thorough analysis of the APIs compared
to JDiff.
# Is it possible that the tool needs to be applied the other way around, that is having 0.22
as the base and Tested version being 0.21?
A was looking into the history of Class org.apache.hadoop.io.MapFile$Reader. The tool says
{code}
  "E1.2 - API type removed" : method protected org.apache.hadoop.io.SequenceFile$Reader org.apache.hadoop.io.MapFile$Reader.createDataFileReader(org.apache.hadoop.fs.FileSystem,org.apache.hadoop.fs.Path,org.apache.hadoop.conf.Configuration)
{code}
But its seems createDataFileReader() has been added in 0.22. Or am I missing something?
# Did you run the tool against MR only? Hard to believe there were no API changes in HDFS
and common.
# What is the final goal of this jira. Is it to identify incompatible changes and make a patch
for site with the release notes?
If so we can filter out non public changes from the reports generated by SigTest and probably
those that do not belong to public APIs in turns of Hadoop annotations, if it makes sense.
# I think for 0.22 we can restrict ourselves to comparing with 0.21 only. Or do people think
we need comparisons with 0.20.* (how many of them?)?
                
> Document incompatible API changes between releases
> --------------------------------------------------
>
>                 Key: HADOOP-7035
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7035
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Tom White
>            Assignee: Tom White
>            Priority: Blocker
>             Fix For: 0.22.0
>
>         Attachments: apicheck-hadoop-0.20.203.0-0.20.204.0.txt, apicheck-hadoop-0.21.0-0.22.0-SNAPSHOT.txt,
jdiff-with-previous-release.sh, jdiff-with-previous-release.sh
>
>
> We can use JDiff to generate a list of incompatible changes for each release. See https://issues.apache.org/jira/browse/HADOOP-6668?focusedCommentId=12860017&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12860017

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