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Posted to user@cassandra.apache.org by David Boxenhorn <da...@citypath.com> on 2011/08/16 14:21:38 UTC

What causes dropped messages?

How can I tell what's causing dropped messages?

Is it just too much activity? I'm not getting any other, more specific
messages, just these:

WARN [ScheduledTasks:1] 2011-08-15 11:33:26,136 MessagingService.java (line
504) Dropped 1534 MUTATION messages in the last 5000ms
WARN [ScheduledTasks:1] 2011-08-15 11:33:26,137 MessagingService.java (line
504) Dropped 58 READ_REPAIR messages in the last 5000ms

Re: What causes dropped messages?

Posted by Jeremy Hanna <je...@gmail.com>.

http://wiki.apache.org/cassandra/FAQ#dropped_messages

As to what's causing them - look in the logs and it will do the equivalent of a nodetool tpstats right after the dropped messages messages.  That should give you a clue as to why there are dropped messages - which thread pools are backed up on that node.

On Aug 16, 2011, at 7:21 AM, David Boxenhorn wrote:

> How can I tell what's causing dropped messages?
> 
> Is it just too much activity? I'm not getting any other, more specific messages, just these: 
> 
> WARN [ScheduledTasks:1] 2011-08-15 11:33:26,136 MessagingService.java (line 504) Dropped 1534 MUTATION messages in the last 5000ms
> WARN [ScheduledTasks:1] 2011-08-15 11:33:26,137 MessagingService.java (line 504) Dropped 58 READ_REPAIR messages in the last 5000ms
>