anmolnar commented on a change in pull request #823: ZOOKEEPER-2694:sync CLI 
command does not wait for result from server
URL: https://github.com/apache/zookeeper/pull/823#discussion_r272195243
 
 

 ##########
 File path: 
zookeeper-server/src/main/java/org/apache/zookeeper/cli/SyncCommand.java
 ##########
 @@ -55,18 +61,27 @@ public CliCommand parse(String[] cmdArgs) throws 
CliParseException {
     @Override
     public boolean exec() throws CliException {
         String path = args[1];
+        CompletableFuture<Integer> cf = new CompletableFuture<>();
+
         try {
             zk.sync(path, new AsyncCallback.VoidCallback() {
-
                 public void processResult(int rc, String path, Object ctx) {
-                    out.println("Sync returned " + rc);
+                    cf.complete(rc);
                 }
             }, null);
+
+            try {
+                int resultCode = cf.get(CONNECTION_TIMEOUT, 
TimeUnit.MILLISECONDS);
+                out.println("Sync returned " + resultCode);
+            } catch (TimeoutException ex) {
+                out.println("Sync is timeout within " +  CONNECTION_TIMEOUT + 
" ms");
+            }
         } catch (IllegalArgumentException ex) {
             throw new MalformedPathException(ex.getMessage());
+        } catch (InterruptedException | ExecutionException ex) {
 
 Review comment:
   It's missing from everywhere else in the code unfortunately.
   There's no harm adding it here anyway.

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