What is your query to fetch rows. Can you share P1,pk2,time for the sample
rows you pasted?
On 17-Aug-2017 2:20 AM, "Nathan McLean" wrote:
> Hello All,
>
> I have a Cassandra cluster with a table similar to the following:
>
> ```
> CREATE TABLE table (
> pk1 text,
> pk2 int,
> time t
Hi Nathan,
The code may occasionally write to the same row multiple times.
>
>
Can you run a test using IF NOT EXISTS in your inserts to see if that makes
a difference? That shouldn't make a difference, but I don't see what the
problem might be at the moment.
--
*Christophe Schmitz**Director
Hi Alex,
You probably didn't get the paralelism right. Serial scan has
a paralelism of one. If the paralelism isn't large enough, perf will be
slow.
If paralelism is too large, Cassandra and the disk will trash and have too
many context switches.
So you need to find your cluster's sweet spot. We
Apache Cassandra is not great in terms of performance at the moment for
batch analytics workloads that require a full table scan. I would look at
FiloDB for all the benefits and familiarity of Cassandra with better
streaming and analytics performance: https://github.com/filodb/FiloDB
There are als
Hello All,
I have a Cassandra cluster with a table similar to the following:
```
CREATE TABLE table (
pk1 text,
pk2 int,
time timestamp,
...
probability list,
PRIMARY KEY ((pk1, pk2), time)
) WITH CLUSTERING ORDER BY (time DESC)
```
Python processes write to this table us
Thank you Eric, for advice. It's great help.-Park
On Tuesday, August 15, 2017 3:42 AM, Erick Ramirez
wrote:
1) You should not perform any streaming operations (repair, bootstrap,
decommission) in the middle of an upgrade. Note that an upgrade is not complete
until you have completed u
Ioannis,
As some people already said, there's one or two keyspaces that uses
EverywhereStrategy, dse_system is one of them, if I'm not wrong.
You must remember to change them to a community strategy or it will fail.
--
Hey,
we are trying Cassandra as an alternative for storage huge stream of data
coming from our customers.
Storing works quite fine, and I started to validate how retrieval does. We
have two types of that: fetching specific records and bulk retrieval for
general analysis.
Fetching single record wo
We use NetworkTopologyStrategy as the replication strategy.
The only DSE specific features we use (left untouched by default) are:
authenticator: com.datastax.bdp.cassandra.auth.DseAuthenticator
authorizer: com.datastax.bdp.cassandra.auth.DseAuthorizer
role_manager: com.datastax.bdp.cassandra.auth
Restarting the Cassandra service resolved this issue. Thanks for your advice!
Sincerely,
Myron A. Semack
From: kurt greaves [mailto:k...@instaclustr.com]
Sent: Tuesday, August 15, 2017 6:10 PM
To: User
Subject: Re: Attempted to write commit log entry for unrecognized table
what does nodetool
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