I have a three nodes Cassandra Cluster and I have created one table which has more than 2,000,000 rows. When I execute this (select count(*) from userdetails) query in cqlsh, I got this error: ...

I would (ideally) like to update a row in Cassandra utilizing pure JSON (e.g., analogous to the "INSERT INTO <table_name> JSON '<json_object_string>';" CQL statement). However, it does ...

I just installed DataStax DevCenter. However when loading up, the Automatic Update & Usage page pops up. However the "Ok" button is disabled and unclickable. So I can't get pass the startup loa...

I am trying to filter a dataframe like below ' val industry_df = industry_df0.filter( col("classification_type").===("GICS") ) ' Me getting error java.lang.AssertionError: assertion failed: u...

I have a cassandra table with an associated materialized view. The primary key is a single id of type uuid, and I have no sort key. Let's call it my_table_id. This table contains a related_id that...

I use Cassandra java driver. I receive 150k requests per second, which I insert to 8 tables having different partition keys. My question is which is a better way: batch inserting to these tabl...

Blocking execute fethod from com.datastax.driver.core.Session public ResultSet execute(Statement statement); Comment on this method: This method blocks until at least some result has been rec...

cassandra cql shell window got disappears after installation in windows? this was installed using MSI installer availalbe in planet cassandra. Why this happens ? please help me.. Thanks in advanc...

I am running spark job on emr and using datastax connector to connect to cassandra cluster. I am facing issues with the guava jar please find the details as below I am using below cassandra deps c...

I have a java API application which connects to cassandra instance. My cassandra instance is hosted on google cloud platform. When I run the program in my IDE, it works fine and is able to connect ...

Is it possible to delete a whole partition from Cassandra table, without writing tombstones and waiting from gc_grace_period and running compaction?

My spring boot web application uses Cassandra DB via the Datastax client and the connection occurs as follow: public CassandraManager(@Autowired CassandraConfig cassandraConfig) { config = cassa...

I have just installed DataStax Community Edition but when trying to run the following command; C:\> net start DataStax_DDC_Server I get the following response: Thanks

I was trying out a simple connection to my Cassandra instance through Java. I made a 'demo' keyspace to cqlsh and created a table in the java program. The code is below: Jars Used: slf4j.api-1.6...

When I try to start Cassandra after patching my OS, I get this error: Exception (java.lang.AbstractMethodError) encountered during startup: org.apache.cassandra.utils.JMXServerUtils$Exporter.expor...

So in the datastax doc, it states that ConsistencyLevel can be set globally through QueryOptions: QueryOptions qo = new QueryOptions().setConsistencyLevel(ConsistencyLevel.ALL); I noticed that t...

I am currently working on my NoSQL project and I have two databases Cassandra and Redis (I am using Redis for caching). Now with Redis I have one list and I serialize my custom object using DataCon...

From two different links of the Cassandra's documentation, I found: link 1 A structure stored in memory that checks if row data exists in the memtable before accessing SSTables on disk and ...

Whenever I insert data in table in Cassandra, more than 1000 and fetching the data by id, it throws the following exception: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(...

I am doing read and update queries on a table having 500000 rows and some times getting below error after processing around 300000 rows, even when no node is down. Cassandra timeout during read ...

Here is what I am trying to do. I have created two nodes of DataStax enterprise cluster,on top of which I have created a java program to get the count of one table (Cassandra database table). Thi...

I have a table in Cassandra like this: CREATE TABLE vroc.sensor_data ( dpnode text, year int, month int, day int, data_timestamp bigint, data_sensor text, dsnode text, data_quality double,...

I am trying to install and run the Datastax cassandra community edition on Redhat Linux but I don't have root privileges. I extracted the tar in my home directory but I'm unable to do ./cassandra ...

I have test case in which I receive 150k requests per second from a client. My test case requires inserting UNLOGGED batch to multiple tables and having different partition keys BEGIN UNLOGGED B...

I am using apache-cassandra-3.10 I understand instead of kill -9 pid, the only way to stop cassandra gracefully is nodetool stopdaemon. But I want to know if nodetool stopdaemon also flushes the ...