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Re: Titan to JanusGraph migration Elasticsearc| "janusgraph" index is created and used , not titan

Jason Plurad <plu...@...>
 

Hi Akshya,

Thanks for the info, and unfortunately it looks like some scenarios were missed. Note that if you created the Titan graph originally with the `index.search.index-name` property set, it would work without additional configuration in JanusGraph.

In your scenario, when opening the graph in JanusGraph with  `index.search.index-name=titan`, this warning is shown:

WARN  org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration  - Local setting index.search.index-name=titan (Type: GLOBAL_OFFLINE) is overridden by globally managed value (janusgraph).  Use the ManagementSystem interface instead of the local configuration to control this setting.

The additional work you need to do is:

mgmt = graph.openManagement()
mgmt.set('index.search.index-name', 'titan')
mgmt.commit()
// at this point the graph is closed, so reopen it with the same properties



On Tuesday, April 25, 2017 at 11:18:11 AM UTC-4, Akshaya Rawat wrote:
Refer https://github.com/JanusGraph/janusgraph/issues/228 for other related issue with migration. 
It seems the default name of elastic search index is also changed from 'titan' to  'janusgraph'. 
"index.search.index-name" property name option should help. 
However I am afraid its not working. I am using BerkeleyDB+Embedded ES option.  
1.  I created the DB with Titan. 
`storage.backend=berkeleyje
storage.directory=data/titan-janus/berkeley
index.search.backend=elasticsearch
index.search.directory=data/titan-janus/es
index.search.elasticsearch.client-only=false
index.search.elasticsearch.local-mode=true
`
2. At this point titan index is created. http://localhost:9200/titan returns index definition.  http://localhost:9200/janusgraph/ returns IndexMissingException. 
3. Data is created in titan index. 
4. Now I migrate the code to Janus. I thought index-name should work and added - 
'index.search.index-name=titan'
5. Now when I start , storage backend works seamlessly. I can query nodes added with Titan. And new nodes are added. 
6. The index backend does not work well. "janusgraph" index is created ( even when index-name is titan). The new nodes never go to "titan" , they are created in "janusgraph" index. 

Akshya
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