[jboss-jira] [JBoss JIRA] (JGRP-1792) "No buffer space available" when sending on Mac OS

[Bela Ban (JIRA)]

Bela Ban created JGRP-1792:
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             Summary: "No buffer space available" when sending on Mac OS
                 Key: JGRP-1792
                 URL: https://issues.jboss.org/browse/JGRP-1792
             Project: JGroups
          Issue Type: Bug
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.5


When sending multicast messages (with MPerf & fast.xml), the following message appears:
{noformat}
8981 [ERROR] UDP: JGRP000029: A: failed sending message to cluster (1053 bytes): java.io.IOException: No buffer space available, headers: MPerf: DATA999, NAKACK2: [MSG, seqno=1003], UDP: [cluster_name=mperf]
{noformat}
The messages *are* received, but the error message occurs on almost every message (1 sender thread sending 1000 messages).

With {{UdpPerf}} (also shipped with JGroups), which also multicasts messages, the error doesn't happen.

With {{UPerf}}, which uses unicasts, the error doesn't occur either.

Todo: compare UdpPerf to MPerf (UDP protocol) to see what the diff is.

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