javagroups-users

[jgroups-users] can failed connection attempts affect jgroups node?

[Questions/problems r. to u. J. <jav...@li...>]

Hi,

One of our customers has a security tool that constantly tries to connect
to each server, so the jgroups logs have this happening every ~4 few
seconds:

2021-10-28 05:18:35 org.jgroups.protocols.TCP warn WARN: JGRP000006: failed
accepting connection from peer
java.io.EOFException
at java.io.DataInputStream.readFully(DataInputStream.java:197)
at
org.jgroups.blocks.cs.TcpConnection.readPeerAddress(TcpConnection.java:245)
at org.jgroups.blocks.cs.TcpConnection.<init>(TcpConnection.java:53)
at org.jgroups.blocks.cs.TcpServer$Acceptor.handleAccept(TcpServer.java:126)
at org.jgroups.blocks.cs.TcpServer$Acceptor.run(TcpServer.java:111)
at java.lang.Thread.run(Thread.java:748)

Can that affect the performance of jgroups? I see it on all nodes, but one
of their nodes, a primary database, when under load sometimes doesn't see
view changes that the other nodes see until a minute or more later. Since
the above happens on *every* node I'd think it's unrelated but wanted to
check. I know it's kind of a *qualitative* question, sorry.

This is with jgroups 4.1.8.Final using a TCP stack. Can get you the full
channel creation info if it helps.

Thanks,
Bobby

Re: [jgroups-users] can failed connection attempts affect jgroups node?

[Questions/problems r. to u. J. <jav...@li...>]

On 18.11.21 13:49, Questions/problems related to using JGroups wrote:
> Hi,
> 
> One of our customers has a security tool that constantly tries to 
> connect to each server, so the jgroups logs have this happening every ~4 
> few seconds:
> 
> 2021-10-28 05:18:35 org.jgroups.protocols.TCP warn WARN: JGRP000006: 
> failed accepting connection from peer
> java.io.EOFException
> at java.io.DataInputStream.readFully(DataInputStream.java:197)
> at 
> org.jgroups.blocks.cs.TcpConnection.readPeerAddress(TcpConnection.java:245)
> at org.jgroups.blocks.cs.TcpConnection.<init>(TcpConnection.java:53)
> at org.jgroups.blocks.cs.TcpServer$Acceptor.handleAccept(TcpServer.java:126)
> at org.jgroups.blocks.cs.TcpServer$Acceptor.run(TcpServer.java:111)
> at java.lang.Thread.run(Thread.java:748)
> 
> Can that affect the performance of jgroups?


I don't think so, this causes an additional TCP connection to be 
(half-)established, but it will be torn down immediately, so a bit of 
processing.

If they use this as a kind of health service ping, why don't they use a 
different port?


> I see it on all nodes, but 
> one of their nodes, a primary database, when under load sometimes 
> doesn't see view changes that the other nodes see until a minute or more 
> later.

That should be unrelated...

> Since the above happens on *every* node I'd think it's unrelated 
> but wanted to check. I know it's kind of a *qualitative* question, sorry.
> 
> This is with jgroups 4.1.8.Final using a TCP stack. Can get you the full 
> channel creation info if it helps.
> 
> Thanks,
> Bobby
> 
> 
> 
> _______________________________________________
> javagroups-users mailing list
> jav...@li...
> https://lists.sourceforge.net/lists/listinfo/javagroups-users
> 

-- 
Bela Ban | http://www.jgroups.org

Re: [jgroups-users] can failed connection attempts affect jgroups node?

[Questions/problems r. to u. J. <jav...@li...>]

Hi again,

Thanks for this -- seems like an obvious answer but I wanted to be sure.

On Mon, Nov 22, 2021 at 3:43 AM Questions/problems related to using JGroups
via javagroups-users <jav...@li...> wrote:

>
> If they use this as a kind of health service ping, why don't they use a
> different port?
>

I think it's a security tool, but I don't know much about it. AFAIK it
attempts to connect to any port in use no matter what is running there to
check for problems.

Cheers,
Bobby