dynamodb-janusgraph-storage-backend | The Amazon DynamoDB Storage Backend for JanusGraph | AWS library
kandi X-RAY | dynamodb-janusgraph-storage-backend Summary
kandi X-RAY | dynamodb-janusgraph-storage-backend Summary
The Amazon DynamoDB Storage Backend for JanusGraph
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Top functions reviewed by kandi - BETA
- Updates an item in the DynamoDB table
- Calculate size in bytes
- Processes a DynamoDB API exception and returns the corresponding DynamoDB exception
- Calculate attribute value size
- Returns an example of how many hash keys are scanned
- Find the next hash key
- Aggregate all boundary keys of the buffer
- Performs a multi slice query
- Execute the query for a range of rows
- Builds the condition
- Loads a graph
- Submits a list of workers
- Deletes an item from the DynamoDB table
- Ensures that a table is deleted
- Issue a query on a DynamoDB table
- Writes a batch write item request
- This method implements the ScanIterator interface
- Creates and returns a list of MutableItems that can be added to DynamoDB updates
- Performs multiple operations in a DynamoDB store
- Initializes the store
- Obtains the next ScanResult from the ScanResult
- Returns a RecordIterator that iterates over all items in the specified ScanResult
- Create a new DynamoDB store
- Performs parallel query and returns the results
- Submits a get item
- Puts an item into DynamoDB table
dynamodb-janusgraph-storage-backend Key Features
dynamodb-janusgraph-storage-backend Examples and Code Snippets
Community Discussions
Trending Discussions on dynamodb-janusgraph-storage-backend
QUESTION
I've set up a JanusGraph instance backed by DynamoDB as described in the GitHub docs, created a simple API in Java to test CRUD operations, and I got creation and read to work. The problem arises when I try to remove data. When adding, I call:
...ANSWER
Answered 2018-Jul-03 at 11:20I'm going to guess that you have some form of version issue. Try that call without using iterate(). Since you are doing just one deletion it should be safe to do next() instead of iterate() to see if that works around the problem. If not, I would align your driver (you are currently 3.3.2) to the version of TinkerPop that JanusGraph is using which for the current release of 0.2 is 3.2.6:
https://github.com/JanusGraph/janusgraph/blob/v0.2.0/pom.xml#L68
I think that you could safely use any version through 3.2.9 without too much worry. Ultimately, I think that the problem is with 3.3.1 with iterate() - see the first bullet point here:
It's generally safe to use mis-matching versions of driver and server so long as you are aware of the upgrade changes like this, but we generally recommend that you don't so that you don't end up with these kinds of problems.
QUESTION
I have dynamodb-janusgraph-storage-backend deployed on AWS and I am trying to figure out how to connect to the gremlin server from Java. I have sbt dependency of dynamodb-janusgraph-storage-backend in my project but I don't want to use the gremlin server running as part of my java application. I need it to run independently and connect java application to that.
I looked into multiple options like using Cluster (gremlin-java) and withRemote (gremlin-driver) but both have limitations. I would like to use the Java Gremlin API which I can't if I use Cluster. Using the withRemote method, I cannot figure out how to initialize the graph instance.
The examples on gremlin docs shows EmptyGraph.instance() which I cannot use if I want to use JanusGraph API.
I need this part to work with Janusgraph:
ANSWER
Answered 2017-Sep-07 at 14:09Currently it is not possible to invoke the JanusGraph Schema APIs via the remote driver. If you don't want to open up a JanusGraph instance from your application, you'd have to build the schema as a String and use Client submit to send it to the Gremlin Server. You can still use the traversal source with remote driver to build and query the graph.
QUESTION
I started a Scala project that uses JanusGraph as a library dependency:
"org.janusgraph" % "janusgraph-core" % "0.1.1",
The project its currently using the inmemory storage backend. However I want to use DynamoDB to persist my graph and eventually deploy the application on AWS.
I found the DynamoDB plugin for JanusGraph https://github.com/awslabs/dynamodb-janusgraph-storage-backend and followed the guide to run the Marvel Universe example. However when I try adding the library to my build.sbt file:
"com.amazonaws" % "dynamodb-janusgraph-storage-backend" % "1.1.0"
It says that the library was not found.
...ANSWER
Answered 2017-Jul-06 at 10:32I released support for JanusGraph 0.1.1 to Central/Sonatype. You can use "com.amazonaws" % "dynamodb-janusgraph-storage-backend" % "1.1.0" to pull in the dependency.
QUESTION
I've written a JUnit Test to check against the generate-modern.groovy graph if marko exists.
My gremlin query being
"g.V().has('name','marko')";
As you can see in the generate-modern.groovy file that indexing is already applied on the name property of the person.
I later made the following
query.force-index=true
property true in the dynamodb.properties file which blocks whole graph scan thereby making indexing mandatory.
However it throws me the following exception
ANSWER
Answered 2017-Aug-03 at 19:10The personByName index definition uses a label constraint.
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