/** Process the {@link WatchedEvent} for a node which represents an {@link AuthenticationKey} */
void processChildNode(WatchedEvent event) throws KeeperException, InterruptedException {
final String path = event.getPath();
switch (event.getType()) {
case NodeDeleted:
// Key expired
if (null == path) {
log.error("Got null path for NodeDeleted event");
return;
}
// Pull off the base ZK path and the '/' separator
String childName = path.substring(baseNode.length() + 1);
secretManager.removeKey(Integer.parseInt(childName));
break;
case None:
// Not connected, don't care. We'll update when we're reconnected
break;
case NodeCreated:
// New key created
if (null == path) {
log.error("Got null path for NodeCreated event");
return;
}
// Get the data and reset the watcher
AuthenticationKey key = deserializeKey(zk.getData(path, this, null));
log.debug("Adding AuthenticationKey with keyId {}", key.getKeyId());
secretManager.addKey(key);
break;
case NodeDataChanged:
// Key changed, could happen on restart after not running Accumulo.
if (null == path) {
log.error("Got null path for NodeDataChanged event");
return;
}
// Get the data and reset the watcher
AuthenticationKey newKey = deserializeKey(zk.getData(path, this, null));
// Will overwrite the old key if one exists
secretManager.addKey(newKey);
break;
case NodeChildrenChanged:
// no children for the children..
log.warn("Unexpected NodeChildrenChanged event for authentication key node {}", path);
break;
default:
log.warn("Unsupported event type: {}", event.getType());
break;
}
}
private int updateAuthKeys(String path) throws KeeperException, InterruptedException {
int keysAdded = 0;
for (String child : zk.getChildren(path, this)) {
String childPath = path + "/" + child;
try {
// Get the node data and reset the watcher
AuthenticationKey key = deserializeKey(zk.getData(childPath, this, null));
secretManager.addKey(key);
keysAdded++;
} catch (NoNodeException e) {
// The master expired(deleted) the key between when we saw it in getChildren() and when we
// went to add it to our secret manager.
log.trace("{} was deleted when we tried to access it", childPath);
}
}
return keysAdded;
}
/**
* Entry point to seed the local {@link AuthenticationKey} cache from ZooKeeper and set the first
* watcher for future updates in ZooKeeper.
*/
public void updateAuthKeys() throws KeeperException, InterruptedException {
// Might cause two watchers on baseNode, but only at startup for each tserver.
if (zk.exists(baseNode, this)) {
log.info(
"Added {} existing AuthenticationKeys to local cache from ZooKeeper",
updateAuthKeys(baseNode));
}
}
