Child processes are randomly killed (occurred with and )

[Alexis de Bernis <al...@bernis.org>]

Hello,

We encountered the following troubling error when dealing with long ant 
tasks. When the server is heavily loaded, ANT tasks may randomly abort 
before their natural end. Adding the verbose flag only shows the 
"[DEBUG] Process finished" log without any exception.

This was first occurring on the <sql> tasks with long running queries 
(about 2 hours to complete), but we recently had the same problem 
running a long <junit> test suite.

We are using Ant 1.7.0, triggered by the Quickbuild 
(http://www.pmease.com/) build server.

Running these tasks when the server is lightly loaded succeeds every 
time. We suspect some sort of OOM errors, but having absolutely no error 
report nor an exception stack trace is troublesome.

Could you please help me in analyzing this problem so I can determine if 
the process gets killed because of Ant ?

Thanks in advance,

-- Alexis

Re: Child processes are randomly killed (occurred with and )

[Steve Loughran <st...@apache.org>]

Alexis de Bernis wrote:
> 
> Hello,
> 
> We encountered the following troubling error when dealing with long ant 
> tasks. When the server is heavily loaded, ANT tasks may randomly abort 
> before their natural end. Adding the verbose flag only shows the 
> "[DEBUG] Process finished" log without any exception.
> 
> This was first occurring on the <sql> tasks with long running queries 
> (about 2 hours to complete), but we recently had the same problem 
> running a long <junit> test suite.
> 
> We are using Ant 1.7.0, triggered by the Quickbuild 
> (http://www.pmease.com/) build server.
> 
> Running these tasks when the server is lightly loaded succeeds every 
> time. We suspect some sort of OOM errors, but having absolutely no error 
> report nor an exception stack trace is troublesome.
> 
> Could you please help me in analyzing this problem so I can determine if 
> the process gets killed because of Ant ?

Ant doesnt kill processes unless you set a timeout on exec or junit, and 
tell junit to fork.

If you run junit with fork=false (the default) is is running in VM/

Now, <sql> is different as it is not a process, it is a JDBC operation. 
So there is no process there to halt, though that may depend on your 
database

 >Adding the verbose flag only shows the
 > "[DEBUG] Process finished" log without any exception.

Try running ant in -debug instead of -verbose, you get a lot more 
information, most of which is unimportant. But as Jan said, this sounds 
more like timeouts in your build server -there may be some options there 
to fix things

(as an aside, what are you doing with a 2hour SQL query in a build? Is 
it to set up the DB, or to test it?)

-- 
Steve Loughran                  http://www.1060.org/blogxter/publish/5
Author: Ant in Action           http://antbook.org/

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