Github user sjcorbett commented on a diff in the pull request:

    https://github.com/apache/incubator-brooklyn/pull/248#discussion_r18926961
  
    --- Diff: 
core/src/main/java/brooklyn/management/ha/ManagementPlaneSyncRecordPersisterToObjectStore.java
 ---
    @@ -291,6 +291,15 @@ public void waitForWritesCompleted(Duration timeout) 
throws InterruptedException
             masterWriter.waitForCurrentWrites(timeout);
         }
     
    +    public void checkpoint(ManagementPlaneSyncRecord record) {
    +        init();
    +        for (ManagementNodeSyncRecord node : 
record.getManagementNodes().values()) {
    +            if (node.getNodeId() != null) {
    --- End diff --
    
    Null check included in case the node in the memento is the one being 
initialised by `BrooklynLauncher` in the copy state command (whose state is 
`INITIALIZING` and whose id is `null`). Is there a better way to handle this 
case?


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