cassandra-2.0

i want to copy data from standardevents to standardeventstemp.. below steps i am doing COPY events.standardevents (uuid, data, name, time, tracker, type, userid) TO 'temp.csv'; truncate standardevents; COPY event.standardeventstemp (uuid, data, name, time, tracker, type, userid) FROM 'temp.csv'; but i am getting below error after 3rd step Bad Request: Invalid STRING constant (3a1ccec0-ef77-11e3-9e56-22000ae3163a) for name of type uuid aborting import at column #0, previously inserted values are still present. can anybody explain the cause of this error and how can i resolve this datatype of

In Java I connect to Cussandra cluster as this: Cluster cluster = Cluster.builder().addContactPoints("host-001","host-002").build(); Do I need to specify all hosts of the cluster in there? What If I have a cluster of 1000 nodes? Do I randomly choose few? How many, and do I really do that randomly? I would say that configuring your client to use the same list of nodes as the list of seed nodes you configured Cassandra to use will give you the best results. As you know Cassandra nodes use the seed nodes to find each other and discover the topology of the ring. The driver will use only one of the

I have a 2 node apache cassandra (2.0.3) cluster with rep factor of 1. I change rep factor to 2 using the following command in cqlsh ALTER KEYSPACE "mykeyspace" WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor' : 2 }; I then tried to run recommended "nodetool repair" after doing this type of alter. The problem is that this command sometimes finishes very quickly. When it does finishes like that it will normally say 'Lost notification...' and exit code is not zero. So I just repeat this 'nodetool repair' until it finishes without error. I also check that 'nodetool status'

I have a lot of (about 1 million in second)structural data that must be insert to database I see a lot of benchmark about sql vs noSql and type of Nosql then collect cassandra as database but I create a benchmark to test mysql vs cassandra in write/update/select speed mysql have better performance in my benchmark, I want to know what is my mistake?? php use as programming language YACassandraPDO and cataloniaframework use as php driver and PDO use as mysql driver my server is centOS 6.5 with 2 core CPU and 2GB RAM, mysql and cassandra have default configuration detail of benchmark: cassandra

When creating table in cassandra, we can give clustering keys with ordering like below. Create table user(partitionkey int, id int, name varchar, age int, address text, insrt_ts timestamp, Primary key(partitionkey, name, insrt_ts, id) with clustering order by (name asc, insrt_ts desc, id asc); when we insert data into that table, As per cassandra documentation records are sorted based on clustering keys. When i retrieve records with CQL1 and CQL2, I am getting in the same sorted order. CQL1: Select * from user where partitionkey=101; CQL2: Select * from user where partitionkey=101 order by

How can atomic batches guarantee that either all statements in a single batch will be executed or none? In order to understand how batches work under the hood, its helpful to look at the individual stages of the batch execution. The client Batches are supported using CQL3 or modern Cassandra client APIs. In each case you'll be able to specify a list of statements you want to execute as part of the batch, a consistency level to be used for all statements and an optional timestamp. You'll be able to batch execute INSERT, DELETE and UPDATE statements. If you choose not to provide a timestamp, the

In Cassandra, I can create a composite partition key, separate from my clustering key: CREATE TABLE footable ( column1 text, column2 text, column3 text, column4 text, PRIMARY KEY ((column1, column2)) ) As I understand it, quering by partition key is an extremely efficient (the most efficient?) method for retrieving data. What I don't know, however, is whether it's also efficient to query by only part of a composite partition key. In MSSQL, this would be efficient, as long as components are included starting with the first (column1 instead of column2, in this example). Is this also the case in