org.apache.cassandra.db
Class HintedHandOffManager

java.lang.Object
  org.apache.cassandra.db.HintedHandOffManager

All Implemented Interfaces:

HintedHandOffManagerMBean

public class HintedHandOffManager
extends java.lang.Object
implements HintedHandOffManagerMBean

For each endpoint for which we have hints, there is a row in the system hints CF. The key for this row is ByteBuffer.wrap(string), i.e. "127.0.0.1". (We have to use String keys for compatibility with OPP.) SuperColumns in these rows are the mutations to replay, with uuid names: : { // key : { // supercolumn mutation: // subcolumn version: table:

key: } } When FailureDetector signals that a node that was down is back up, we page through the hinted mutations and send them over one at a time, waiting for hinted_handoff_throttle_delay in between each. deliverHints is also exposed to JMX so it can be run manually if FD ever misses its cue somehow.

Field Summary

static java.lang.String	HINTS_CF
static HintedHandOffManager	instance

Constructor Summary

HintedHandOffManager()

Method Summary

java.util.Map<java.lang.String,java.lang.Integer>	countPendingHints() List all the endpoints that this node has hints for, and count the number of hints for each such endpoint.
void	deleteHintsForEndpoint(java.net.InetAddress endpoint)
void	deleteHintsForEndpoint(java.lang.String ipOrHostname) Nuke all hints from this node to `ep`.
java.util.List<java.lang.String>	listEndpointsPendingHints() List all the endpoints that this node has hints for.
void	scheduleHintDelivery(java.net.InetAddress to)
void	scheduleHintDelivery(java.lang.String to) force hint delivery to an endpoint
void	start()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

instance

public static final HintedHandOffManager instance

HINTS_CF

public static final java.lang.String HINTS_CF

See Also:

Constant Field Values

Constructor Detail

HintedHandOffManager

public HintedHandOffManager()

Method Detail

start

public void start()

deleteHintsForEndpoint

public void deleteHintsForEndpoint(java.lang.String ipOrHostname)

Description copied from interface: HintedHandOffManagerMBean

Nuke all hints from this node to `ep`.

Specified by:

deleteHintsForEndpoint in interface HintedHandOffManagerMBean

Parameters:

ipOrHostname - String rep. of endpoint address to delete hints for, either ip address ("127.0.0.1") or hostname

deleteHintsForEndpoint

public void deleteHintsForEndpoint(java.net.InetAddress endpoint)

scheduleHintDelivery

public void scheduleHintDelivery(java.net.InetAddress to)

scheduleHintDelivery

public void scheduleHintDelivery(java.lang.String to)
                          throws java.net.UnknownHostException

Description copied from interface: HintedHandOffManagerMBean

force hint delivery to an endpoint

Specified by:

scheduleHintDelivery in interface HintedHandOffManagerMBean

Throws:

java.net.UnknownHostException

listEndpointsPendingHints

public java.util.List<java.lang.String> listEndpointsPendingHints()

Description copied from interface: HintedHandOffManagerMBean

List all the endpoints that this node has hints for.

Specified by:

listEndpointsPendingHints in interface HintedHandOffManagerMBean

Returns:

set of endpoints; as Strings

countPendingHints

public java.util.Map<java.lang.String,java.lang.Integer> countPendingHints()

Description copied from interface: HintedHandOffManagerMBean

List all the endpoints that this node has hints for, and count the number of hints for each such endpoint.

Specified by:

countPendingHints in interface HintedHandOffManagerMBean

Returns:

map of endpoint -> hint count