[Spread-users] packet not exist alarm
John Robinson
jr at vertica.com
Wed May 14 11:34:41 EDT 2008
Under heavy competing (TCP) load, we have found that spread sometimes
reports network partitions. In at least one case, a spread daemon
crashed with this alarm:
[Sun 11 May 2008 10:12:24] ====================
[Sun 11 May 2008 10:13:00] Discard_packets: (EVS before transitional)
packet 41 not exist
Exit caused by Alarm(EXIT)
The configuration is a single network segment with 3 daemons on 3 hosts,
and one client per daemon. The daemons are nice -20 (but not
real-time). OS is Red Hat EL5. The traffic load over spread is modest.
Have others dealt with situations like this? One thought we had was to
change the configuration to 3 segments to force the daemons to use TCP
instead of UDP (is this correct?). No doubt the daemons are seeing a
very heavy UDP packet loss rate. We hope not to have to deal with
configuring QoS or insisting on two networks.
Many thanks,
/jr
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