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From il-woon Ahn <>
Subject Two questions : Server crash during compaction and UnavailableException
Date Sun, 01 Aug 2010 08:04:12 GMT
Hi all

Nowadays I'm using Cassandra DB under high read/write loads.

I have two questions:

First, Cassandra suddenly dies during compaction. Java core dump says that
the last thread run was  "COMPACTION-POOL:1".
I suspect that my business logic could lead size of columns in a column
family per a row to be greater than two gigabytes. (but i couldn't confirm
it yet)
Can this be a cause of the server down and is there any solution? (should I
wait 0.7?)

Second, It seems that my client program often get UnavailableException from
Cassandra when Cass is running in normal.
Is it possible to get such an exception in high read/write loads even if
Cassandra is up?
I handled this to try to send client's request again after 1 sec, like
handling TimedOutException. Is there any other recommended reaction?

Thanks in advance.


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