[logback-user] Prudent [sic!] mode logging to NFS-mounted file

[Casey Lucas]

We recently (within the last few months) decided to try prudent mode on an
NFS mounted file system.  We saw apparent deadlocks but in reality it
ended up being a bug in the Solaris NFS code (non java) that made the
locks very slow (not deadlocked). It was on Solaris 10.x x86. Oracle
identified it as a bug and came back with a patch, but we had since given
up on NFS locking.  If you're familiar with C and running commands like
"truss", you might also want to verify NFS locking support with java and
logback out of the picture. I can send a test C program if desired.

-casey







On 12/28/11 3:19 PM, "ThomasSchuessler2 at Eaton.com"
<ThomasSchuessler2 at Eaton.com> wrote:

We are getting stuck threads, any advice?

####<Dec 28, 2011 9:29:30 AM EST> <Error> <WebLogicServer>
<[obfuscated]> <soa_server1> <[STANDBY] ExecuteThread: '395' for queue:
'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <>
<8f08ad23754ca371:-6015b447:13484e5a335:-7ffe-0000000000005269>
<1325082570435> <BEA-000337> <[STUCK] ExecuteThread: '261' for queue:
'weblogic.kernel.Default (self-tuning)' has been busy for "707" seconds
working on the request
"weblogic.servlet.internal.ServletRequestImpl at 429fb0e6[
POST /Custom[obfuscated]Service/Custom[obfuscated]Port HTTP/1.1
TE: trailers, deflate, gzip, compress
User-Agent: Oracle HTTPClient Version 10h
SOAPAction: "null"
Authorization: [obfuscated]
Accept-Encoding: gzip, x-gzip, compress, x-compress
ECID-Context:
1.a161c6d66e04e744:-2716b1b5:1346c7f4437:-7ffe-00000000000a19aa;kXhDsLK[
obfuscated]KIVPToLQSJLQSqPRO_GNRmKS
Content-type: text/xml; charset=UTF-8
Content-Length: 3607
Connection: Keep-Alive
Proxy-Client-IP: [obfuscated]
X-Forwarded-For: [obfuscated]
X-WebLogic-KeepAliveSecs: 30
X-WebLogic-Force-JVMID: unset
X-WebLogic-Request-ClusterInfo: true

]", which is more than the configured time (StuckThreadMaxTime) of "600"
seconds. Stack trace:
Thread-1020 "[STUCK] ExecuteThread: '261' for queue:
'weblogic.kernel.Default (self-tuning)'" <alive, suspended, blocked,
priority=1, DAEMON> {
    -- Blocked trying to get lock: java.lang.Object at 489d327d[fat lock]

ch.qos.logback.core.OutputStreamAppender.subAppend(OutputStreamAppender.
java:205)

ch.qos.logback.core.rolling.RollingFileAppender.subAppend(RollingFileApp
ender.java:149)

ch.qos.logback.core.OutputStreamAppender.append(OutputStreamAppender.jav
a:104)

ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAp
penderBase.java:67)

ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(App
enderAttachableImpl.java:51)
    ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:281)
    ch.qos.logback.classic.Logger.callAppenders(Logger.java:267)

ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:468
)
    ch.qos.logback.classic.Logger.filterAndLog_2(Logger.java:450)
    ch.qos.logback.classic.Logger.debug(Logger.java:559)

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From: logback-user-bounces at qos.ch [mailto:logback-user-bounces at qos.ch]
On Behalf Of ceki
Sent: Mittwoch, 21. Dezember 2011 18:55
To: logback users list
Subject: Re: [logback-user] Prudent [sic!] mode logging to NFS-mounted
file

Logback should have complained about the unknown property. Anyway, let
us know if prudent mode work with NFS. (Prudent mode under NFS was
tested a long time ago and if I remember correctly it worked fine.)
--
Ceki
http://twitter.com/#!/ceki

On 21.12.2011 18:40, ThomasSchuessler2 at Eaton.com wrote:
> Thank you very much for the fast answer. I feel so stupid.
>
> -----Original Message-----
> From: logback-user-bounces at qos.ch [mailto:logback-user-bounces at qos.ch]
> On Behalf Of ceki
> Sent: Mittwoch, 21. Dezember 2011 17:49
> To: logback users list
> Subject: Re: [logback-user] Prudent mode logging to NFS-mounted file
>
>
> Check spelling of prudent (not prudend).
>

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