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From Blake Day <bl...@chewy.com>
Subject Re: syslog-ng disconnect causes thread to silently die?
Date Wed, 20 Jan 2016 00:17:26 GMT
I’m having trouble getting additional debug messages, but I did get the following logs with
immediateFail=true on the SocketAppender only.


By the way, I’m using an AsyncAppender. Would that cause the error handling to work differently?


2016-01-19 18:30:11,995 AsyncAppender-ASYNC-SYSLOG ERROR Unable to write to stream TCP:localhost:601
for appender SYSLOG
2016-01-19 18:30:11,996 AsyncAppender-ASYNC-SYSLOG ERROR An exception occurred processing
Appender SYSLOG org.apache.logging.log4j.core.appender.AppenderLoggingException: Error writing
to TCP:localhost:601
	at org.apache.logging.log4j.core.net.TcpSocketManager.write(TcpSocketManager.java:140)
	at org.apache.logging.log4j.core.appender.OutputStreamManager.write(OutputStreamManager.java:136)
	at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:105)
	at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:152)
	at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:125)
	at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:116)
	at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
	at org.apache.logging.log4j.core.appender.AsyncAppender$AsyncThread.callAppenders(AsyncAppender.java:308)
	at org.apache.logging.log4j.core.appender.AsyncAppender$AsyncThread.run(AsyncAppender.java:261)
Caused by: java.net.SocketException: Broken pipe
	at java.net.SocketOutputStream.socketWrite0(Native Method)
	at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109)
	at java.net.SocketOutputStream.write(SocketOutputStream.java:153)
	at org.apache.logging.log4j.core.net.TcpSocketManager.write(TcpSocketManager.java:131)
	... 8 more
2016-01-19 18:30:52,941 Thread-42 DEBUG Connection to localhost:601 reestablished.









On 1/19/16, 4:59 PM, "Ralph Goers" <ralph.goers@dslextreme.com> wrote:

>Can you enable the debug logging so we can see what is happening in the Appender?
>
>Ralph
>
>> On Jan 19, 2016, at 1:32 PM, Blake Day <blake@chewy.com> wrote:
>> 
>> Sorry, on further investigation, it appears that the thread does not die. But the
subsequent log messages are lost from the syslog side.  I found https://issues.apache.org/jira/browse/LOG4J2-122,
but I am not sure what to make of it.  I’ve also tried playing with immediateFail and reconnectionDelayMillis,
but nothing seems to have the effect I want.
>> 
>> 
>> 
>> On 1/19/16, 2:36 PM, "Blake Day" <blake@chewy.com> wrote:
>> 
>>> I’m using SocketAppender to log to syslog-ng.
>>> 
>>> 
>>> When logging a message that exceeds 8192 bytes (a syslog-ng setting), syslog-ng
gives an error and closes the connection.  What happens immediately after is unclear, but
it appears that the java thread just dies silently.  The thread itself is a quartz scheduler
worker thread, but I thought I’d ask here to see whether you guys think this is a log4j
related issue.  There are no java application logs (console or otherwise) to suggest what
happened.
>>> 
>>> 
>>> Here is the output from syslog-ng’s side:
>>> 
>>> 
>>> 2016-01-19T14:26:34-05:00 ERR syslog-ng[87462]: - Incoming frame larger than
log_msg_size(); log_msg_size='8192', frame_length='100233'
>>> 
>>> 2016-01-19T14:26:34-05:00 NOTICE syslog-ng[87462]: - Syslog connection closed;
fd='34', client='AF_INET(127.0.0.1:10142)', local='AF_INET(0.0.0.0:601)'
>>> 
>> 
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