Maintenance - Practical Cassandra - page 87

7. Maintenance

At this point, your cluster is up and running. There is data coming in and
everything seems to be humming along. But Cassandra is not a set-it-and-forget-it
system. Maintenance is required, and there are tools to help you perform the ne-
cessary maintenance tasks.

Understanding nodetool

The most basic command that you should be familiar with when administering
a Cassandra cluster is nodetool. nodetool is a command-line interface to
Cassandra cluster management. It can provide you with basic information about
an individual node or all nodes in the cluster or ring.
As of Cassandra 1.2, nodetool provides the options shown in Listing 7.1 .
Listing 7.1 nodetool Output
Click here to view code image

usage: java org.apache.cassandra.tools.NodeCmd --
host <arg> <command>

-a,--include-all-sstables includes sstables

that are already on the

most recent version

during upgradesstables.
-cf,--column-family <arg> only take a snapshot
of the specified column family.
-et,--end-token <arg> token at which repair

range ends.
-h,--host <arg>

node hostname or ip

address.
-local,--in-local-dc

only repair against

nodes in the same datacenter.
-p,--port <arg> remote jmx agent port

number.
-pr,--partitioner-range only repair the first

range returned by the