Cassandra is a highly scalable, eventually consistent, distributed, structured row/column store.

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cqlsh 'Select' statement does not return the data that exists

I have the following Cassandra table:CREATE TABLE myflights.flights_by_airport2 (origin text,dep_time timestamp,fl_date timestamp,airline_id int,carrier text,fl_num int,PRIMARY KEY ((origin), ...
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16 views

Cassandra mapping error: Invalid number of PRIMARY KEY columns provided, 0 expected but got 1

I have a User case class:@Table(keyspace="users", name="user", readConsistency="QUORUM", writeConsistency="QUORUM")case class User(@Column(name="email")@PartitionKeyemail: ...
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10 views

Cassandra db PHP driver, cannot page queries with both ORDER BY and a IN restriction on the partition key

I cant get results for the following query using datastax PHP driver,select * from track where id='35209' and day in (20180314,20180315,20180316) and datetime < '2018-03-15 11:00:00' order by ...
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17 views

VARINT vs BIGINT in cassandra

I want to know when to use VARINT instead of BIGINT?What is the limitation of each of them and how much space is being used by VARINT?
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26 views

How to use Node.js promises for a function (CassandraDB driver when executing query)

I am using client.stream() from Cassandra DB's driver to fetch large result sets using pages, then for each row result returned I am pushing it into an array defined at the top of my scope. After ...
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23 views

Does Cassandra provide read-after-write consistency for a single node?

On a single node Cassandra, if I performwrite(key=A, value=3)write(key=A, value=5)a_value=read(key=A)would a_value be 3, or 5? Or in other words, does Cassandra guarantee read-after-write ...
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9 views

Invalid Query: Some cluster keys are missing

My table was created with this query, but when I try to insert data into the table, I get the error: 'Some cluster keys are missing: created'Table Structure:CREATE TABLE db.feed (...
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18 views

Spring boot doesn't commit changes with cassandra

I have a very simple spring boot application that communicate with cassandra . In my sample When I run myApplication keySpace "myTestKeySpace" created but when i stop application that automatically ...
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23 views

Cassandra connection exception on large transactions

I am using a cassandra docker container with the java api (localhost:8888 mapped to the container's 9042 port), with an application that only reads data from the keyspace.Problem is, on large ...
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9 views

Any ramifications with calling DseCluster.init()/close() every minute?

I have a 2-node DC and I’m trying to use the DseCluster object for health checking each node by calling DseCluster.init() and close() after. If init() fails, then I know that node is down. The methods ...
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15 views

Cassandra client driver timeout parameters

I observed the following timeout parameters in Cassandra driver,counter_write_request_timeout_in_ms: 5000range_request_timeout_in_ms: 10000request_timeout_in_ms: 100001) Could somebody explain ...
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16 views

Cassandra multi-region settings/optimization

I configured two DC with replication in two regions (NCSA and EMEA) using Janusgraph (Gremlin/Cassandra/Elasticsearch). The replication work well and everything, however the performance are not that ...
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15 views

how to write for cassandra database and kafka unit tests?

I'm new in node js. I'm writing a microservice which listening kafka messages and save data to cassandra. That's it. How write unit test for my service?
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29 views

Difference between timeout setting in client and server side

As per this flow : Cassandra read_request_timeout_in_ms set up for external(Client) request , I understand that setting the timeout in server side is not just enough, we need to set in client side too....
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28 views

Datastax CE Cassandra migrate to Apache Cassandra

I have Datastax community edition 2.2.11 Cassandra with 90 nodes in a cluster. I am trying to migrate to Apache Cassandra 2.2.11First I would like to try in my test environment but couldn't find ...

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