You can use the TimeUUID type in Cassandra, which backs a Type 1 UUID. This uses the current time and the creator’s MAC address and a sequence number. If the TimeUUID number is generated correctly this can be done with zero collisions (you can use the CQL now() method or insert your own, the java … Read more
What do you mean, C++? Hand coded assembly would be faster if you have a few decades to spare.
cqlsh -e “select * from ks.table limit 1;” > ~/output
Since you don’t care about the data, removing files from \data\commitlogs should be easiest solution.
Did you do any research on the matter? Picking a driver You need a way to communicate with cassandra, best option is to use a high level API. You have a wide range of choices here but when we look at it from a high level prespective there are really two choices. CQL based drivers … Read more
The version of Cassandra that you are using is only compatible with Python 2.x. The following syntax: except ImportError, e: was deprecated in Python 2.7 and removed in Python 3.x. Nowadays, you use the as keyword: except ImportError as e: This means that you need to either downgrade to Python 2.x or get a version … Read more
There are a couple of ways to go about this. From within cqlsh, you can simply show version. aploetz@cqlsh> show version [cqlsh 5.0.1 | Cassandra 2.1.8 | CQL spec 3.2.0 | Native protocol v3] However, that only works from within cqlsh. Fortunately, you can also query system.local for that information as well. aploetz@cqlsh> SELECT cql_version … Read more
Below definitions are quoted from Akka Documentation at-most-once delivery means that for each message handed to the mechanism, that message is delivered zero or one times; in more casual terms it means that messages may be lost. at-least-once delivery means that for each message handed to the mechanism potentially multiple attempts are made at delivering … Read more
Since Cassandra 3.4 (3.5 recommended), LIKE queries can be achieved using a SSTable Attached Secondary Index (SASI). For example: CREATE TABLE cycling.cyclist_name ( id UUID PRIMARY KEY, lastname text, firstname text ); Creating the SASI as follows: CREATE CUSTOM INDEX fn_prefix ON cyclist_name (firstname) USING ‘org.apache.cassandra.index.sasi.SASIIndex’; Then a prefix LIKE query is working: SELECT * … Read more
Short answer: No. By design, Cassandra values availability and partition tolerance over consistency1. Basically, it’s not possible to get acceptable latency while maintaining all three of qualities: one has to be sacrificed. This is called CAP theorem. The amount of consistency is configurable in Cassandra using consistency levels, but there doesn’t exist any semantics for … Read more