[jboss-jira] [JBoss JIRA] Commented: (JGRP-1119) TCP can cause memory usage when connecting to a non-JGroups service

[Bela Ban (JIRA)]

    [ https://jira.jboss.org/jira/browse/JGRP-1119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12528191#action_12528191 ] 

Bela Ban commented on JGRP-1119:
--------------------------------

Actually, I cannot reproduce this (with a simple program listening on one of the ports listed in initial_hosts): when JGroups connects to unknownservice:7800, and unknownservice is NOT a JGroups members, then the following happens:
- JGroups will create a Connection to unknwownservice:7800
- The read will block
- BasicTCP will destroy the connection to unknownservice:7800 because it is not part of the view

Hmm, this is for joins, but TCPPING is also used by MERGE2, so what happens when no view is received ? Then the connection to unknownservice:7800 would linger around until the next view is received...

> TCP can cause memory usage when connecting to a non-JGroups service
> -------------------------------------------------------------------
>
>                 Key: JGRP-1119
>                 URL: https://jira.jboss.org/jira/browse/JGRP-1119
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 2.4.7
>            Reporter: Dennis Reed
>            Assignee: Bela Ban
>             Fix For: 2.10
>
>
> JGroups does not verify that it is connecting to a JGroups service before using the data returned.
> If it connects to another service (for example if another service is found in TCPPING's scan), it reads the first four bytes, uses it as the size of a buffer, and blocks until it fills the buffer with data (or the server kills the connection).
> The symptoms are the same as JGRP-1116.

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