Short answers: - compaction - Initiate immediate full compaction. Removes deleted data. - clean - Initiates immediate cleanup i.e. remove the data that is deleted and that doesn't belong to this node. Internally performs full compaction. - repair - Used to make different copies (replicas) of data consistent by exchanging data with with other replicas.
The details on following links should be good to understand them in detail: http://www.datastax.com/docs/0.7/utilities/nodetool <http://www.datastax.com/docs/0.7/utilities/nodetool> http://wiki.apache.org/cassandra/NodeProbe <http://wiki.apache.org/cassandra/NodeProbe> http://wiki.apache.org/cassandra/Operations <http://wiki.apache.org/cassandra/Operations>Thanks, Naren On Wed, Mar 30, 2011 at 12:57 PM, Jonathan Colby <jonathan.co...@gmail.com>wrote: > I'm a little unclear on the differences between the nodetool operations: > > - compaction > - repair > - clean > > I understand that compaction consolidates the SSTables and physically > performs deletes by taking into account the Tombstones. But what does clean > and repair do then? > > > > -- Narendra Sharma Solution Architect *http://www.persistentsys.com* *http://narendrasharma.blogspot.com/*
