Re: log4j and log file lock?

On Aug 15, 2:25 pm, alejandrina <apat...@xxxxxxxxx> wrote:
Hi all,

We have a processor farm (currently 8 machines) running the same
application with different input parameters. We use log4j to record
interesting stuff; we'd like to use a single log file in a networked
disk. We noticed that the 8 machines are trampling on each other as
they write to the log file (symptoms are nulls embedded in messages,
incomplete messages, duplicate messages....). I have assumed that this
is because access to the log file is not "locked" (using something
like Java's FileLock API).

Is there a solution to this problem? Thread syncronization is not an
option, of course, as these are different computers.

Thanks for any ideas,

Alejandrina

You can also look at the SocketAppender/SimpleSocketServer (It is in
the same package as the Syslog appender mentioned by Owen.)

http://logging.apache.org/log4j/docs/api/org/apache/log4j/net/package-summary.html

I've seen SocketAppender+SimpleSocketServer being used at several
instances which are similar to your setup. One thing to be careful
about is the message rate; which, if faster than the network
(connection to the server), will cause the client to block.

-cheers,
Manish

.

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