cassandra

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List a complete column family using consistency quorum

I am a faily recent user of Cassandra. I went through the basics, setting up my schemas and plugging a java application to a database. Didn\'t run into any major problem putting together a sample app.[详细]

2023-04-13 06:31 分类：问答
Which strategy to use for designing a log data storage?

We want to design a data storage with Relational database keeping the request message(http/s,xmpp etc.) logs. For generating logs we use a solution based on Apache synapse esb. However since we want t[详细]

2023-04-12 18:44 分类：问答
How to change the key of row in cassandra?

I need to change(to update it with new value) the key of row in cassandra. How can i do that? Of course i can select all rows with previos key and then insert their columns with new key, and delete th[详细]

2023-04-12 18:22 分类：问答
How to use cql queries to get different datatypes out of cassandra with java client hector

I\'m new to cassandra and hector so i\'m trying to execute cql queries but the problem is that not all columns are of type string so how dow I execute the query \"select * from users\"?[详细]

2023-04-12 14:01 分类：问答
Cassandra issue when counting millions of columns

I was inserting columns to row, and by cassandra-cli checking qty of them: [default@CassandraExample] count admins[ascii(\'0\')];[详细]

2023-04-12 06:13 分类：问答
SliceQuery in Hector API for cassandra DB throws HInvalidRequestException: InvalidRequestException(why:Key may not be empty)

I have username and password as the columns of a ColumnFamily keyed with userName. create column family TestUserInfo with comparator = UTF8Type with[详细]

2023-04-12 06:01 分类：问答
What database is good enough for logging application?

I am writing a web application with nodeJS that can be used by other applications to store logs and accessed later in a web interface or by applications themselves providing an API. Similar to Graylog[详细]

2023-04-11 20:37 分类：问答
Cassandra File System

According to brisk implementation [ Presentation in Cassandra SF ] - Cassandra, CFS, Job/Task Tracker and Hive Metastore run in a single JVM which is totally different from Configuring an independent[详细]

2023-04-11 09:06 分类：问答
ThriftColumnFamilyTemplate for querying super column family and their columns

I have a cassandra data model that\'s super column family. There are multiple super columns and every super column has multiple columns of different type (for example quantity is integer, Id is long,[详细]

2023-04-11 03:28 分类：问答
What does cassandra do during compaction?

I know that cassandra merges sstables, row-keys,remove tombstone and all. But i am really interested to know how it performs compaction ?[详细]

2023-04-10 20:20 分类：问答