graphdb/titan1/src/main/java/org/apache/atlas/repository/graphdb/titan1/Titan1GraphManagement.java [138:150]:
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    public void deletePropertyKey(String propertyKey) {
        PropertyKey titanPropertyKey = management.getPropertyKey(propertyKey);

        if (null == titanPropertyKey) return;

        for (int i = 0;; i++) {
            String deletedKeyName = titanPropertyKey + "_deleted_" + i;
            if (null == management.getPropertyKey(deletedKeyName)) {
                management.changeName(titanPropertyKey, deletedKeyName);
                break;
            }
        }
    }
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graphdb/titan0/src/main/java/org/apache/atlas/repository/graphdb/titan0/Titan0GraphManagement.java [114:126]:
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    public void deletePropertyKey(String propertyKey) {
        PropertyKey titanPropertyKey = management.getPropertyKey(propertyKey);

        if (null == titanPropertyKey) return;

        for (int i = 0;; i++) {
            String deletedKeyName = titanPropertyKey + "_deleted_" + i;
            if (null == management.getPropertyKey(deletedKeyName)) {
                management.changeName(titanPropertyKey, deletedKeyName);
                break;
            }
        }
    }
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