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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12479) ProtocMojo does not log the reason for a protoc compilation failure.
Date Thu, 15 Oct 2015 14:27:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14958977#comment-14958977
] 

Chris Nauroth commented on HADOOP-12479:
----------------------------------------

bq. That change to exec() doesn't break anything does it?

No, it's fine.  The only other caller is the {{VersionInfoMojo}}.  I chose to do the {{Exec}}
change in a way that would be backward-compatible for {{VersionInfoMojo}}.  It's a new overload
of the {{run}} method that captures stderr in a separate in/out variable.  Only {{ProtocMojo}}
calls the new overload.  {{VersionInfoMojo}} still calls the old one.

An alternative would have been just to dump both stdout and stderr into the same in/out variable
used by the existing {{run}} method.  That could have been dangerous, because {{VersionInfoMojo}}
has specific expectations about the output, and dumping stderr on top of that could have harmed
that logic.

Thanks for the review.  I'll commit later today.

> ProtocMojo does not log the reason for a protoc compilation failure.
> --------------------------------------------------------------------
>
>                 Key: HADOOP-12479
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12479
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: build
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>            Priority: Minor
>         Attachments: HADOOP-12479.001.patch
>
>
> If protoc fails with a compilation error in the proto files, our Maven plugin won't print
the details.  The only way to figure it out is to repeat running the {{protoc}} command manually
from outside the Hadoop build.  This is because our {{ProtocMojo}} only captures stdout from
the {{protoc}} command, and compilation errors get written to {{stderr}}.



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