You can configure the length of the queue by changing memtable_flush_queue_size in the cassandra.ya

Cassandra manages user accounts and access to the database cluster using passwords.

JdbcWritableBridge class contains a set of methods which can read db columns from a ResultSet into Java types.

Once authenticated into a database cluster using either internal authentication, the next security issue to be tackled is permission management.

The more you compress data, the greater number of compressed blocks you have and the larger the compression offset table.

ZooKeeper supports the concept of watches. Clients can set a watch on a znodes.

Zookeeper is used for node, master and index management in the grid.

If the HBase's ZooKeeper data is removed, only the transient operations are affected “ data can continue to be written and read to/from HBase.

Sqoop is a connectivity tool for moving data from non-Hadoop data stores “ such as relational databases and data warehouses “ into Hadoop.

The size at which lobs spill into separate files is controlled by the “inline-lob-limit argument, which takes a parameter specifying the largest lob size to keep inline, in bytes.