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Posted to user@cassandra.apache.org by Maciej Miklas <ma...@gmail.com> on 2012/08/08 10:11:18 UTC

Cassandra 1.0 - is disk seek required to access SSTable metadata

Hi all,

older Cassandra versions had to read columns from each SSTable with
positive bloom filter in order to find recent value.
This was optimized with: Improve read performance in update-intensive
workload <https://issues.apache.org/jira/browse/CASSANDRA-2498>
Now each SSTable has metadata - SSTableMetadata.

Bloom filter is stored in RAM, but what about metadata?
Is disk seek required to access it?

Thanks,
Maciej

Re: Cassandra 1.0 - is disk seek required to access SSTable metadata

Posted by Sylvain Lebresne <sy...@datastax.com>.

> Bloom filter is stored in RAM, but what about metadata?
> Is disk seek required to access it?

No, it's loaded in RAM when the sstable is loaded.

--
Sylvain