nodetool enablehintsfordc

Enable hints for a datacenter.

Synopsis

nodetool [options] enablehintsfordc [--] <datacenter>

Cassandra tarball installations:

installation_location/cassandra/bin

Table 1. Options
Short	Long	Description
`-h`	`--host`	Hostname or IP address.
`-p`	`--port`	Port number.
`-pwf`	`--password-file`	Password file path.
`-pw`	`--password`	Password.
`-u`	`--username`	Remote JMX agent username.
`datacenter`	The datacenter to enable.
`--`	Separates an option from an argument that could be mistaken for a option.

Note:

For tarball installations, execute the command from the install_location/bin directory.
If a username and password for RMI authentication are set explicitly in the cassandra-env.sh file for the host, then you must specify credentials.
nodetool enablehintsfordc operates on a single node in the cluster if -h is not used to identify one or more other nodes. If the node from which you issue the command is the intended target, you do not need the -h option to identify the target; otherwise, for remote invocation, identify the target node, or nodes, using -h.
[--] can be used to separate command-line options from the list of arguments, when the list might be mistaken for options.

Description

The nodetool enablehintsfordc command is used to turn on hints for a datacenter. The cassandra.yaml file has a parameter, hinted_handoff_disabled_datacenters that will blacklist datacenters on startup. If a datacenter can be enabled later with nodetool enablehintsfordc.

Examples

nodetool -u cassandra -pw cassandra enablehintsfordc DC2

The location of the cassandra-env.sh file depends on the type of installation:

Cassandra package installations	/etc/cassandra/cassandra-env.sh
Cassandra tarball installations	`install_location`/conf/cassandra-env.sh