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From Ramzi Rabah <>
Subject TimedOutException
Date Wed, 16 Dec 2009 18:46:26 GMT
We are observing increasing number of TimedOutExceptions in cassandra
0.5 trunk although the load seems fairly low (about 400 reads/writes
per second).
cfstats reports that operations are taking less than 2 ms on average.

2 Things I have noticed looking at the source code.

1- TimedOutExceptions are silently swallowed by Cassandra and not
reported in the logs even at debug level
2- readstats does not account for these long time running queries that
time out.

I'm wondering, what could be causing the system to go haywire like
this? and how much is a reasonable read/write performance on some of
the user's successful deployments before the system starts getting bad
response times.


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