How to measure the write amplification of C*?

2016-03-09 Thread Dikang Gu
Hello there, I'm wondering is there a good way to measure the write amplification of Cassandra? I'm thinking it could be calculated by (size of mutations written to the node)/(number of bytes written to the disk). Do we already have the metrics of "size of mutations written to the node"? I did n

Re: Cassandra-stress output

2016-03-09 Thread Stefania Alborghetti
On Tue, Mar 8, 2016 at 8:39 PM, Jean Carlo wrote: > Hi guys, > > I use cassandra stress to populate the next table > > CREATE TABLE cf1 ( > kvalue text, > ktype text, > prov text, > dname text, > dattrib blob, > dvalue text, > PRIMARY KEY (kvalue, ktype, prov, dname) >

Re: Able to reproduce JAVA-268

2016-03-09 Thread Brandon Williams
This doesn't really belong on dev@ but user@, however I believe you can just create a jira account there and do what you want. On Wed, Mar 9, 2016 at 7:50 PM, Saurabh Sethi wrote: > Hi, > > I am able to reproduce the following Cassandra bug with version 3.3 and > would like to add more info to J

Able to reproduce JAVA-268

2016-03-09 Thread Saurabh Sethi
Hi, I am able to reproduce the following Cassandra bug with version 3.3 and would like to add more info to Jira like stack trace and debug log: https://datastax-oss.atlassian.net/browse/JAVA-268 Can someone gime me temporary access to upload them and add my comments? Thanks, Saurabh

Re: TTL rows with 2i

2016-03-09 Thread Sam Tunnicliffe
The problem with row level ttls in this regard is that the scope of a particular compaction may not include all versions of a given row. So just because a primary key liveness denoting an expired row may be written to the new SSTable, it doesn't necessarily mean that an index should purge its entry

TTL rows with 2i

2016-03-09 Thread Eduardo Alonso
Hi, We have been investigating how to include in our 2i implementation the ability to index TTL expirable Cells in Cassandra 3.x. Reading comments in o.a.c.index.Index.Indexer.removeRows it seems that this method is called when a compaction detects that a cell has expired. I dont know if this is