org.apache.hadoop.hdfs.server.balancer

Interface Matcher

public interface Matcher

A matcher interface for matching nodes.

Field Summary

Fields

Modifier and Type	Field and Description
static Matcher	ANY_OTHER Match any datanode with any other datanode.
static Matcher	SAME_NODE_GROUP Match datanodes in the same node group.
static Matcher	SAME_RACK Match datanodes in the same rack.

Method Summary

Modifier and Type	Method and Description
boolean	match(NetworkTopology cluster, Node left, Node right) Given the cluster topology, does the left node match the right node?

Field Detail

SAME_NODE_GROUP

static final Matcher SAME_NODE_GROUP

Match datanodes in the same node group.

SAME_RACK

static final Matcher SAME_RACK

Match datanodes in the same rack.

ANY_OTHER

static final Matcher ANY_OTHER

Match any datanode with any other datanode.

Method Detail

match

boolean match(NetworkTopology cluster,
              Node left,
              Node right)

Given the cluster topology, does the left node match the right node?