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From "Kristian Waagan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5608) BaseTestCase.readProcessOutput should read getInputStream() and getErrorStream() in separate threads
Date Tue, 21 Feb 2012 08:22:34 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13212450#comment-13212450
] 

Kristian Waagan commented on DERBY-5608:
----------------------------------------

Removed a space character prepended to the stdout output with revision 1291647.
Does anyone see enough failures related to this issue to warrant backporting the fix, which
should also include DERBY-5617?
                
> BaseTestCase.readProcessOutput should read getInputStream()  and getErrorStream() in
separate threads
> -----------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5608
>                 URL: https://issues.apache.org/jira/browse/DERBY-5608
>             Project: Derby
>          Issue Type: Bug
>          Components: Test
>    Affects Versions: 10.9.0.0
>            Reporter: Kathey Marsden
>            Assignee: Kristian Waagan
>            Priority: Minor
>             Fix For: 10.9.0.0
>
>         Attachments: derby-5608-1a-use_spawnedprocess.diff, derby-5608-2a-clear_interrupt_flag_on_waitFor.diff
>
>
> BaseTestCase.readProcessOutput() reads the streams from Process.getInputStream() and
Process.getErrorStream() sequentially 
> InputStream is = pr.getInputStream();
> InputStream es = pr.getErrorStream();
> ...
>  output += "<STDOUT> " + inputStreamToString(is) + "<END STDOUT>\n";
>  output += "<STDERR>" + inputStreamToString(es) + "<END STDERR>\n";
> I think that to be really correct the  two streams need to be read in separate threads
because if the error output  is  large it could block and cause a hang  if they are read sequentially
like this.
> I noticed during the DERBY-5601 discussion as Myrna referenced in that  the addition
of draining the error stream caused a different problem (an InterruptException). I don't understand
how it could cause that problem but do think a hang blocking on  reading the input would be
possible if the error output was large enough both  before and after the change to add the
reading of the error stream sequentially.

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