[GitHub] tinkerpop issue #745: TINKERPOP-1830: fix race condition in TinkerIndex

[robertdale <gi...@git.apache.org>]

Github user robertdale commented on the issue:

    https://github.com/apache/tinkerpop/pull/745
  
    The race condition is in `put()` and it's used elsewhere. It would make more sense to fix `put()` to be thread-safe.  Then we can keep `parallelStream()`
    
    ```
            Map<Object, Set<T>> keyMap = this.index.get(key);
            if (keyMap == null) {
                keyMap = this.index.putIfAbsent(key, new ConcurrentHashMap<>());
            }
            Set<T> objects = keyMap.get(value);
            if (null == objects) {
                objects = keyMap.putIfAbsent(value, ConcurrentHashMap.newKeySet());
            }
            objects.add(element);
    ```


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