/**
* Get a list of all the other region servers in this cluster and set a watch
*
* @return a list of server nanes
*/
private List<String> getRegisteredRegionServers() {
List<String> result = null;
try {
result = ZKUtil.listChildrenAndWatchThem(this.zookeeper, this.zookeeper.rsZNode);
} catch (KeeperException e) {
this.abortable.abort("Get list of registered region servers", e);
}
return result;
}
/** List all registered peer clusters and set a watch on their znodes. */
@Override
public List<String> getAllPeerIds() {
List<String> ids = null;
try {
ids = ZKUtil.listChildrenAndWatchThem(this.zookeeper, this.peersZNode);
} catch (KeeperException e) {
this.abortable.abort("Cannot get the list of peers ", e);
}
return ids;
}
@Override
public void nodeChildrenChanged(String path) {
if (path.equals(ZooKeeperAdmin.PG_SERVER_NODE)) {
try {
List<String> servers =
ZKUtil.listChildrenAndWatchThem(watcher, ZooKeeperAdmin.PG_SERVER_NODE);
add(servers);
} catch (IOException e) {
abortable.abort("Unexpected zk exception getting server nodes", e);
} catch (KeeperException e) {
abortable.abort("Unexpected zk exception getting server nodes", e);
}
}
}
public void start() throws KeeperException, IOException {
watcher.registerListener(this);
List<String> servers = ZKUtil.listChildrenAndWatchThem(watcher, ZooKeeperAdmin.PG_SERVER_NODE);
add(servers);
}