/** Given a zooCache and instanceId, look up the instance name. */
public static String lookupInstanceName(ZooCache zooCache, UUID instanceId) {
ArgumentChecker.notNull(zooCache, instanceId);
for (String name : zooCache.getChildren(Constants.ZROOT + Constants.ZINSTANCES)) {
String instanceNamePath = Constants.ZROOT + Constants.ZINSTANCES + "/" + name;
byte[] bytes = zooCache.get(instanceNamePath);
UUID iid = UUID.fromString(new String(bytes, Constants.UTF8));
if (iid.equals(instanceId)) {
return name;
}
}
return null;
}
/**
* @param config Client configuration for specifying connection options. See {@link
* ClientConfiguration} which extends Configuration with convenience methods specific to
* Accumulo.
* @since 1.6.0
*/
public ZooKeeperInstance(Configuration config) {
ArgumentChecker.notNull(config);
if (config instanceof ClientConfiguration) {
this.clientConf = (ClientConfiguration) config;
} else {
this.clientConf = new ClientConfiguration(config);
}
this.instanceId = clientConf.get(ClientProperty.INSTANCE_ID);
this.instanceName = clientConf.get(ClientProperty.INSTANCE_NAME);
if ((instanceId == null) == (instanceName == null))
throw new IllegalArgumentException(
"Expected exactly one of instanceName and instanceId to be set");
this.zooKeepers = clientConf.get(ClientProperty.INSTANCE_ZK_HOST);
this.zooKeepersSessionTimeOut =
(int)
AccumuloConfiguration.getTimeInMillis(
clientConf.get(ClientProperty.INSTANCE_ZK_TIMEOUT));
zooCache = ZooCache.getInstance(zooKeepers, zooKeepersSessionTimeOut);
}
