On Mon, Jun 18, 2012 at 8:53 AM, mich.hph <mich....@gmail.com> wrote:
> Dear all! > In my cluster, I found every key needs 192bytes in the key cache.So I want > to know what determines the memory that used by key cache. How to calculate > the value. > According to http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Calculate-memory-used-for-keycache-tp6170528p6170814.htmlthe formula is: key cache memory use = <Keycache size> * (<8 bytes for position i.e. value> + <X bytes for key> + <16 bytes for token (RP)> + <8 byte reference for DecoratedKey> + <8 bytes for descriptor reference>) which simplifies to <Keycache size> * (<key size in bytes> + 40) Are your row keys 152 bytes? Jim > Thanks in advance. >
