[Amdatu-developers] [JIRA] (AMDATUCASSANDRA-184) Registering CF definitions using thift CfDef changes attributes that have not been set

Tue, 10 Apr 2012 08:10:21 -0700

The defaults of Hector and Cassandra are the same, except for these two configuration entries:

DEFAULT_MEMTABLE_THROUGHPUT_IN_MB
DEFAULT_MEMTABLE_OPERATIONS_IN_MILLIONS

In Cassandra, the defaults are:

DEFAULT_MEMTABLE_THROUGHPUT_IN_MB = (int) (Runtime.getRuntime().maxMemory() / (1048576 * 16));
DEFAULT_MEMTABLE_OPERATIONS_IN_MILLIONS = 0.3*DEFAULT_MEMTABLE_THROUGHPUT_IN_MB/64;

And in Hector:

DEFAULT_MEMTABLE_THROUGHPUT_IN_MB = 500;
DEFAULT_MEMTABLE_OPERATIONS_IN_MILLIONS = 0.3*DEFAULT_MEMTABLE_THROUGHPUT_IN_MB/64;

The 500 Mb of Hector would be the same as the Cassandra default if you run a VM with 8 Gb heap.
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