Re: Performance Characteristics of CASSANDRA-16 (Memory Efficient Compactions)

2010-06-08 Thread Jonathan Ellis
of course. compaction is always O(N) with the size of the data On Mon, Jun 7, 2010 at 9:51 AM, Jeremy Davis wrote: > Reads, ok.. What about Compactions? Is the cost of compacting going to be > ever increasing with the number of columns? > > > > On Sat, Jun 5, 2010 at 7:30 AM, Jonathan Ellis wro

Re: Performance Characteristics of CASSANDRA-16 (Memory Efficient Compactions)

2010-06-07 Thread Jeremy Davis
Reads, ok.. What about Compactions? Is the cost of compacting going to be ever increasing with the number of columns? On Sat, Jun 5, 2010 at 7:30 AM, Jonathan Ellis wrote: > #16 is very simple: it allows you to make very large rows. That is all. > > Other things being equal, doing reads from

Re: Performance Characteristics of CASSANDRA-16 (Memory Efficient Compactions)

2010-06-05 Thread Jonathan Ellis
#16 is very simple: it allows you to make very large rows. That is all. Other things being equal, doing reads from really big rows will be slower (since the row index will take longer to read) and this patch does not change this. On Fri, Jun 4, 2010 at 5:47 PM, Jeremy Davis wrote: > > https://i

Performance Characteristics of CASSANDRA-16 (Memory Efficient Compactions)

2010-06-04 Thread Jeremy Davis
https://issues.apache.org/jira/browse/CASSANDRA-16 Can someone (Jonathan?) help me understand the performance characteristics of this patch? Specifically: If I have an open ended CF, and I keep inserting with ever increasing column names (for example current Time), will things generally work out