Quick question.
I am using Cassandra 1.0.11
When is nodetool cfhistograms output reset? I know that data is collected
during read requests. But I am wondering if it is data since the beginning
(start of Cassandra) or if it is reset periodically?
Thanks!
Rene
On 1 October 2013 16:21, Rene Kochen rene.koc...@schange.com wrote:
Quick question.
I am using Cassandra 1.0.11
When is nodetool cfhistograms output reset? I know that data is collected
during read requests. But I am wondering if it is data since the beginning
(start of Cassandra) or if it
If I look at Read Latency I see indeed that they are reset during two runs
of cfhistograms. However, Row Size and Column Count keep the values.
When are they re-evaluated?
Thanks!
Rene
2013/10/1 Richard Low rich...@wentnet.com
On 1 October 2013 16:21, Rene Kochen rene.koc...@schange.com
On Tue, Oct 1, 2013 at 2:34 PM, Rene Kochen rene.koc...@emea.schange.comwrote:
However, Row Size and Column Count keep the values. When are they
re-evaluated?
They are re-evaluated during compaction.
--
Tyler Hobbs
DataStax http://datastax.com/
Thanks!
Does that mean that cfhistograms scans all Statistics.db files in order to
populate the Row Size and Column Count values?
2013/10/1 Tyler Hobbs ty...@datastax.com
On Tue, Oct 1, 2013 at 2:34 PM, Rene Kochen
rene.koc...@emea.schange.comwrote:
However, Row Size and Column Count
On Tue, Oct 1, 2013 at 3:52 PM, Rene Kochen rene.koc...@emea.schange.comwrote:
Does that mean that cfhistograms scans all Statistics.db files in order to
populate the Row Size and Column Count values?
On startup, yes. After that, it should be updated as new SSTables are
created.
--
Tyler
