Vladimir Hudec created LOG4J2-1230:
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Summary: Concatenated SYSLOG Messages
Key: LOG4J2-1230
URL: https://issues.apache.org/jira/browse/LOG4J2-1230
Project: Log4j 2
Issue Type: Bug
Components: Core
Affects Versions: 2.5
Environment: Linux, Java7, WebLogic 12
Reporter: Vladimir Hudec
Under heavy traffic load several SYSLOG messages can be concatenated, which is
not correct.
The problem is, several threads in AbstractOutputStreamAppender can reach in
the next code write() before one thread reaches flush() (the readLock.lock() is
not lock at all)
@Override
public void append(final LogEvent event) {
readLock.lock();
try {
final byte[] bytes = getLayout().toByteArray(event);
if (bytes.length > 0) {
manager.write(bytes);
if (this.immediateFlush || event.isEndOfBatch()) {
manager.flush();
}
}
} catch (final AppenderLoggingException ex) {
error("Unable to write to stream " + manager.getName() + " for
appender " + getName());
throw ex;
} finally {
readLock.unlock();
}
}
In DatagramOutputStream all messages are cumulated in instance variable
private byte[] data;
Synchronized methods don't help and in this case the synchronization in
DatagramOutputStream is useless, as the correct synchronization should be
provided in AbstractOutputStreamAppender.
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