GrantPSpencer commented on code in PR #2607:
URL: https://github.com/apache/helix/pull/2607#discussion_r1336432505
##########
meta-client/src/main/java/org/apache/helix/metaclient/impl/zk/ZkMetaClient.java:
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@@ -115,6 +116,52 @@ public void create(String key, Object data,
MetaClientInterface.EntryMode mode)
}
}
+ @Override
+ public void recursiveCreate(String key, T data, EntryMode mode) {
+ // Function named recursiveCreate to match naming scheme, but actual work
is iterative
+ iterativeCreate(key, data, mode, -1);
+ }
+
+ @Override
+ public void recursiveCreateWithTTL(String key, T data, long ttl) {
+ iterativeCreate(key, data, EntryMode.TTL, ttl);
+ }
+
+ private void iterativeCreate(String key, T data, EntryMode mode, long ttl) {
+ List<String> nodePaths = separateIntoUniqueNodePaths(key);
+ int i = 0;
+ // Ephemeral nodes cant have children, so change mode when creating parents
+ EntryMode parentMode = (EntryMode.EPHEMERAL.equals(mode) ?
+ EntryMode.PERSISTENT : mode);
+
+ // Iterate over paths, starting with full key then attempting each
successive parent
+ // Try /a/b/c, if fails due to NoNode then try /a/b .. etc..
+ while (i < nodePaths.size()) {
+ try {
+ if (EntryMode.TTL.equals(mode)) {
+ createWithTTL(nodePaths.get(i), data, ttl);
+ } else {
+ create(nodePaths.get(i), data, i == 0 ? mode : parentMode);
+ }
+ break;
+ // NoNodeException thrown when parent path does not exist. We allow
this and re-attempt
+ // creation of these nodes below
+ } catch (MetaClientNoNodeException ignoredParentDoesntExistException) {
+ i++;
+ }
+
+ }
+
+ // Reattempt creation of children that failed due to NoNodeException
+ while (--i >= 0) {
+ if (EntryMode.TTL.equals(mode)) {
+ createWithTTL(nodePaths.get(i), data, ttl);
+ } else {
+ create(nodePaths.get(i), data, i == 0 ? mode : parentMode);
+ }
+ }
+ }
Review Comment:
Changed to ignore when NodeExistsException thrown when we try to create the
parents, only throw when we try to create the full node path. This means we
don't throw an error if another thread has already created the parents we are
trying to create.
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