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From Moty Kosharovsky <>
Subject re-execution of failed queries with rpc_timeout
Date Mon, 15 Apr 2013 01:12:45 GMT

I'm running a 12 node cluser with cassandra 1.1.5 and oracle jdk 1.6.0_35.
Our application constantly writes large updates with cql. Once in a while,
an rpc_time will occur.

Since a lot of the information is counters, its impossible for me to
understand if the updates complete partially on rpc_timeout, or cassandra
somehow rolls back the change completely, and hence I can't tell if I
should re-execute the query on rpc_timeout (with double processing being a
bigger concern than missing updates).

I am thinking, but unsure of this, that if I'll switch to LOCAL_QUORUM,
rpc_timeout will always mean that the update was not processes as a whole.
In all other cases, the rpc_timeout might be thrown from a remote node (not
the one I'm connected to), and hence some parts of the update will be
performed and others parts will not.

Anyone solved this issue before?

Kind Regards,

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