> 2) Rad from disk all row keys, in order to find one (binary search)
No.
At startup cassandra samples the -index.db component every index_interval keys.
At worst index_interval keys must be read from disk.
> As I understand, in the worst case, we can have three disk seeks (2, 4, 6)
> pro SSTa
Great articles, I did not find those before !
*
SSTable Index - yes I mean column Index.
*I would like to understand, how many disk seeks might be required to find
column in single SSTable.
I am assuming positive bloom filter on row key. Now Cassandra needs to find
out whenever given SSTable cont
> What about SSTable index,
Not sure what you are referring to there. Each row has a in a SStable has a
bloom filter and may have an index of columns. This is not cached.
See http://thelastpickle.com/2011/07/04/Cassandra-Query-Plans/ or
http://www.slideshare.net/aaronmorton/cassandra-sf-2012-t
Hi all,
bloom filter for row keys is always in RAM. What about SSTable index, and
Metadata?
Is it cached by Cassandra, or it relays on memory mapped files?
Thanks,
Maciej
