Re: repair performance

good point! i did not (so far) i will do that - especially because i often see all compaction threads being used during repair (according to compactionstats). thank you also for your link recommendations. i will go through them. On Sat, 2017-03-18 at 16:54 +, Thakrar, Jayesh wrote: You cha

Re: Error of "You have to be logged in and not anonymous to perform this request"

Thanks. Good to know that. But that's a little confusing for first time using Cassandra. 2017-03-19 19:16 GMT-07:00 Max Campos : > These commands don’t really mean anything unless you’re using > authentication. If you want to enable roles / authentication / etc, then > follow the instructions in

Re: Grouping time series data into blocks of times

reading your description it seems like each data point you get is a self contained item, is that right? or are you recalculating some data for the entire block with each new message? On Sun, Mar 19, 2017 at 9:27 PM, Nate McCall wrote: > I think you would be better served by using a streaming sys

Re: Grouping time series data into blocks of times

I think you would be better served by using a streaming system like Apache Flink (http://flink.apache.org) and checkpointing occasionally to Cassandra. This is a significant increase in complexity, but you are describing a real-time streaming use case with the need for watermarking time windows an

Re: Error of "You have to be logged in and not anonymous to perform this request"

These commands don’t really mean anything unless you’re using authentication. If you want to enable roles / authentication / etc, then follow the instructions in the manual: http://cassandra.apache.org/doc/latest/operating/security.html#authentication

Error of "You have to be logged in and not anonymous to perform this request"

Hi I can't do any actions even with the superuser "cassandra". cassandra@cqlsh> list roles; Unauthorized: Error from server: code=2100 [Unauthorized] message="You have to be logged in and not anonymous to perform this request" cassandra@cqlsh> CREATE USER dba WITH PASSWORD 'bacon' SUPERUSER; Unau

Re: Running cassandra

Hi I can start my cassandra but I can't do any actions even with the superuser "cassandra". cassandra@cqlsh> list roles; Unauthorized: Error from server: code=2100 [Unauthorized] message="You have to be logged in and not anonymous to perform this request" cassandra@cqlsh> CREATE USER dba WITH PAS

Re: Running cassandra

You're welcome! 2017-03-19 18:41 GMT+01:00 Long Quanzheng : > You are RIGHT! > It's working after I remove the env variable GREP_OPTIONS. > > Thanks! > > 2017-03-19 10:08 GMT-07:00 benjamin roth : > >> I once had the same problem. In my case it was the coloured output of >> grep that injected ans

Re: Running cassandra

You are RIGHT! It's working after I remove the env variable GREP_OPTIONS. Thanks! 2017-03-19 10:08 GMT-07:00 benjamin roth : > I once had the same problem. In my case it was the coloured output of grep > that injected ansi codes into the CS startup command. > > Am 19.03.2017 18:07 schrieb "Long

Re: Running cassandra

I once had the same problem. In my case it was the coloured output of grep that injected ansi codes into the CS startup command. Am 19.03.2017 18:07 schrieb "Long Quanzheng" : > Hi > It still doesn't work. > > The real problem is this error: > > Error: Could not find or load main class -ea > > Th

Re: Running cassandra

Hi It still doesn't work. The real problem is this error: Error: Could not find or load main class -ea Thanks Long On Sun, Mar 19, 2017 at 3:16 AM Vinci wrote: > You need to have a log directory to be able to run cassandra. > > mkdir logs > > then start the cassandra process. > > Ori

Re: How can I scale my read rate?

Have you tried using PreparedStatements? On Sat, Mar 18, 2017 at 9:47 PM S G wrote: > ok, I gave the executeAsync() a try. > Good part is that it was really easy to write the code for that. > Bad part is that it did not had a huge effect on my throughput - I gained > about 5% increase in through

Re: How can I scale my read rate?

On 19/03/2017 02:54, S G wrote: Forgot to mention that this vmstat picture is for the client-cluster reading from Cassandra. Hi SG, Your numbers are low, 15k req/sec would be ok for a single node, for a 12 nodes cluster, something goes wrong... how do you measure the throughput? As sugge