Hello Everyone,

I have found the root cause for this issue and also have the fix for the same.

Please guide me if I can contribute for this project as I'm new to this community.

Thanks

Shiva

On Monday, June 8, 2020 at 6:50:04 PM UTC+5:30, Shiva Krishnan wrote:

Hi,

I have noticed a corruption in index after reindexing vertex-centric indices with direction 'IN'.

Issue : A self-link is getting added to every vertex after reindexing.

To demonstrate this, I have taken a very small graph consists of two vertices (A & B) and one edge connecting the two.

Edge Label -> link

Edge has one property key (Integer) -> assocKind

//Creating the Vertex Centrix Index

gremlin > edgeLabel = mgmt.getEdgeLabel("link");

gremlin > assocKind= mgmt.getPropertyKey("assocKind")

gremlin > mgmt.buildEdgeIndex(edgeLabel, "myVertexCentricIndex", Direction.IN, assocKind);

Please note i have given the direction IN for the index.

//Creating the Edge from A to B: (a and b are vertices)

a.addEdge("link",b,"assocKind",1)

Output Before Reindexing :

gremlin> g.V().has('name' , 'A').inE().hasLabel('link').has('assocKind',1)

//no IN edges to vertex A  Correct

gremlin> g.V().has('name' , 'A').outE().hasLabel('link').has('assocKind',1)

==>e[4e1f-b6g-1bit-1pqw][14488-link->80024]   Correct

Now I ran the reindex command

// 'index' is the vertex centric index which is created above

gremlin> m.updateIndex(index, SchemaAction.REINDEX).get()

Output After Reindexing :

gremlin> g.V().has('_objId','A').inE().hasLabel('link').has('assocKind',1)

==>e[4e1f-b6g-1bit-b6g][14488-link->14488] Wrong

gremlin> g.V().has('_objId','A').bothE().hasLabel('link').has('assocKind',1)

==>e[4e1f-b6g-1bit-1pqw][14488-link->80024]

==>e[4e1f-b6g-1bit-b6g][14488-link->14488] Unexpected Link

This issue happens in janusgraph 0.5.2 also.

Thanks

Shiva

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