@boris
https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/MeteredFlusher.java#L51
On Sun, Jul 8, 2012 at 8:44 AM, Boris Yen wrote:
> I am not sure, but I think there should be only 6 memtables (max) based on
> the example. 1 is active, 4 are in the queue, 1 is being
I am not sure, but I think there should be only 6 memtables (max) based on
the example. 1 is active, 4 are in the queue, 1 is being flushed.
Is this correct?
On Wed, Jun 6, 2012 at 9:08 PM, rohit bhatia wrote:
> Also, Could someone please explain how the factor of 7 comes in the
> picture in th
You question was
Could you please throw light on the what conditions does
MeteredFlusher use to trigger memtable flushes.
The answer is estimates of the ratio between the live size and the serialised
size of memtables are kept. The MeteredFlusher periodically checks the
serialised size
Also, Could someone please explain how the factor of 7 comes in the
picture in this sentence
"For example if memtable_total_space_in_mb is 100MB, and
memtable_flush_writers is the default 1 (with one data directory), and
memtable_flush_queue_size is the default 4, and a Column Family has no
second
Hi..
the link http://thelastpickle.com/2011/05/04/How-are-Memtables-measured/
mentions that "From version 0.7 onwards the worse case scenario is up
to CF Count + Secondary Index Count + memtable_flush_queue_size
(defaults to 4) + memtable_flush_writers (defaults to 1 per data
directory) memtables
Hi Aaron
Thanks for the link, I have gone through it. But this doesn't justify
nodes of exactly same config/specs differing in their flushing
frequency.
The traffic on all node is same as we are using RandomPartitioner
Thanks
Rohit
On Wed, Jun 6, 2012 at 12:24 AM, aaron morton wrote:
> See the
See the section on memtable_total_space_in_mb here
http://thelastpickle.com/2011/05/04/How-are-Memtables-measured/
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 6/06/2012, at 2:27 AM, rohit bhatia wrote:
> I am trying to understand the v
I am trying to understand the variance in flushes frequency in a 8
node Cassandra cluster.
All the flushes are of the same type and initiated by MeteredFlusher.java =>
"INFO [OptionalTasks:1] 2012-06-05 06:32:05,873 MeteredFlusher.java
(line 62) flushing high-traffic column family CFS(Keyspace='St
