BewareMyPower commented on a change in pull request #10600:
URL: https://github.com/apache/pulsar/pull/10600#discussion_r633269132



##########
File path: 
pulsar-metadata/src/main/java/org/apache/pulsar/metadata/impl/ZKMetadataStore.java
##########
@@ -360,4 +368,35 @@ private static CreateMode 
getCreateMode(EnumSet<CreateOption> options) {
     public long getZkSessionId() {
         return zkc.getSessionId();
     }
+
+    @Override
+    public CompletableFuture<Void> initializeCluster() {
+        if (this.metadataURL == null) {
+            return FutureUtil.failedFuture(new 
MetadataStoreException("metadataURL is not set"));
+        }
+        if (this.metadataStoreConfig == null) {
+            return FutureUtil.failedFuture(new 
MetadataStoreException("metadataStoreConfig is not set"));
+        }
+        int chrootIndex = metadataURL.indexOf("/");
+        if (chrootIndex > 0) {
+            String chrootPath = metadataURL.substring(chrootIndex);
+            String zkConnectForChrootCreation = metadataURL.substring(0, 
chrootIndex);
+            try (ZooKeeper chrootZk = ZooKeeperClient.newBuilder()
+                    .connectString(zkConnectForChrootCreation)
+                    
.sessionTimeoutMs(metadataStoreConfig.getSessionTimeoutMillis())
+                    .connectRetryPolicy(
+                            new 
BoundExponentialBackoffRetryPolicy(metadataStoreConfig.getSessionTimeoutMillis(),
+                                    
metadataStoreConfig.getSessionTimeoutMillis(), 0))
+                    .build()) {
+                if (chrootZk.exists(chrootPath, false) == null) {
+                    ZkUtils.createFullPathOptimistic(chrootZk, chrootPath, new 
byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE,
+                            CreateMode.PERSISTENT);
+                    log.info("Created zookeeper chroot path {} successfully", 
chrootPath);
+                }
+            } catch (Exception e) {
+                return FutureUtil.failedFuture(e);
+            }
+        }
+        return CompletableFuture.completedFuture(null);

Review comment:
       I agree with @eolivelli that if you're going to design an asynchronous 
API, it's better keep using CompletableFuture. I suggested using a synchronous 
API here just because your implementation is a synchronous way @fantapsody 




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