xyuanlu commented on code in PR #2623:
URL: https://github.com/apache/helix/pull/2623#discussion_r1340455192
##########
meta-client/src/main/java/org/apache/helix/metaclient/impl/zk/ZkMetaClientCache.java:
##########
@@ -102,14 +102,90 @@ public List<T> get(List<String> keys) {
return dataList;
}
+ /**
+ * Get the direct children for a given key.
+ * @param key For metadata storage that has hierarchical key space (e.g.
ZK), the key would be
+ * a parent key,
+ * For metadata storage that has non-hierarchical key space
(e.g. etcd), the key would
+ * be a prefix key.
+ * @return list of direct children or null if key doesn't exist / cache is
not populated yet.
+ */
@Override
public List<String> getDirectChildrenKeys(final String key) {
- throw new MetaClientException("Not implemented yet.");
+ if (_cacheChildren) {
+ TrieNode node = getTree(key);
+ if (node == null) {
+ LOG.debug("Children not found in cache for key: {}. This could
be because the cache is still being populated.", key);
+ return null;
+ }
+ return new ArrayList<>(node.getChildren().keySet());
Review Comment:
Consider using `ImmutableArray`
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