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https://issues.apache.org/jira/browse/HADOOP-12194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14616985#comment-14616985
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Ravi Prakash commented on HADOOP-12194:
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Hi Andrew! It should be sufficient to check the modification time of the output
directory, don't you think? I understand that has the downside that all protoc
files will be compiled again, but how often do we change the protoc files in
the first place?
Anyway, my build which I run as {{mvn -Pdist -Pnative -Dmaven.javadoc.skip
-DskipTests install}} is failing with:
{code}
[ERROR] Failed to execute goal
org.apache.hadoop:hadoop-maven-plugins:3.0.0-SNAPSHOT:protoc (compile-protoc)
on project hadoop-yarn-api: java.io.FileNotFoundException:
<my-source-code-directory>/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/proto/server
(Is a directory) -> [Help 1]
{code}
I did a git clean -fdx too.
> Support for incremental generation in the protoc plugin
> -------------------------------------------------------
>
> Key: HADOOP-12194
> URL: https://issues.apache.org/jira/browse/HADOOP-12194
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.0.6-alpha
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: hadoop-12194.001.patch
>
>
> The protoc maven plugin currently generates new Java classes every time,
> which means Maven always picks up changed files in the build. It would be
> better if the protoc plugin only generated new Java classes when the source
> protoc files change.
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