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From Ondřej Černoš <>
Subject Compaction, truncate, cqlsh problems
Date Thu, 11 Apr 2013 13:48:42 GMT

I use C* 1.2.3 and CQL3.

I integrated cassandra into our testing environment. In order to make the
tests repeatable I truncate all the tables that need to be empty before the
test run via ssh session to the host cassandra runs on and by running cqlsh
where I issue the truncate.

It works, only sometimes it silently fails (1 in 400 runs of the truncate,

At the same time the truncate fails I see system ks compaction.
Additionally, it seems there is quite a lot of these system ks compactions
(the numbers in the filenames go up pretty fast to thousands).

I googled truncate and found out there were some issues with race
conditions and with slowing down if truncate is used frequently (as is my
case, where truncate is run before each test in quite a big test suite).

Any hints?

Ondřej Černoš

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