RE: I'll buy you dinner if you can help me with strace/java ETIMEDOUT challenge :)
- From: <Christopher.Taylor2@xxxxxxxxxxxx>
- To: <iperegudov@xxxxxxxx>
- Date: Fri, 12 Apr 2013 15:50:20 -0500
The problem is more of a challenge which is: How to reduce overhead in the
java engine for a heavily utilized java app that executes around 200 jdbc
connections during a 4 hour batch window.
So the effort is to skinny down what java is doing by "not doing work that is
not needed".
iptables is off for the database servers.
Chris
-----Original Message-----
From: Iliya Peregoudov [mailto:iperegudov@xxxxxxxx]
Sent: Friday, April 12, 2013 1:13 AM
To: Taylor Christopher - Nashville
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: I'll buy you dinner if you can help me with strace/java ETIMEDOUT
challenge :)
ETIMEDOUT errors in the strace output you've attached are all returned by
futex() system call. This system call is not related to networking.
futex() system call is used to implement POSIX threads locking primitives like
mutex, condvar, etc. And ETIMEDOUT error is not actually an error for
pthread_cond_timedwait() or similar.
It will be better if you tell the problem you have. Do you have connection
timeout when connecting from App server to DB server? Network problems are
better to diagnose using nslookup and traceroute.
Personally I bet on a misconfigured iptables firewall on DB server.
On 11.04.2013 22:29, Christopher.Taylor2@xxxxxxxxxxxx wrote:
> I'm getting a weird ETIMEDOUT error on a linux appserver connecting to my
> database server in the STRACE output and was curious if anyone has worked
> through anything like this?
> This is a JDBC connection using SUN (Oracle) java 1.7
>
> Googling this seems to be [maybe] related to:
> a.) IPV6 enabled class where IPV6 is not enabled on the networks
> involved
> b.) network subnets maybe diff between appserver and db server
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