Github user okram commented on the issue:
https://github.com/apache/tinkerpop/pull/485
I do like `Traversal.metadata()`. However, I think that metadata should be
stored at the root traversal only. Thus, its a global blackboard. Next, given
that its an `Admin` method, it should just use standard Java method naming --
`Traversal.getMetadata()`, `Traversal.setMetadata()`. If the traversal is NOT
the root, then it walks the tree to get the metadata from the root.
If we do the metadata-thang in this ticket, we should update all the MARKER
strategies -- AdjacentToIncident and SubgraphStrategy. (prolly some other?).
I think your `NoBarrier` work should really just be inlined into
`LazyBarrierStragegy` and `PathRetractionStrategy`. Checkout how
`LazyBarrierStrategy` has this notion of labeled paths and path processor ...
its a "switch" to say whether or not to barrier.
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