JanusGraph/janusgraph

Kryo registrator options for Spark

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#1,194 opened on Jul 27, 2018

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 (2 comments) (0 reactions) (0 assignees)Java (1,137 forks)batch import
area/docsarea/sparkhelp wantedkind/enhancement

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Description

This came up during a documentation review:

https://github.com/JanusGraph/janusgraph/blob/0.2/janusgraph-hadoop-parent/janusgraph-hadoop-core/src/test/resources/cassandra-read.properties#L30 Should we use:

spark.kryo.registrator=org.janusgraph.hadoop.serialize.JanusGraphKryoRegistrator

Or:

spark.kryo.registrator=org.apache.tinkerpop.gremlin.spark.structure.io.gryo.GryoRegistrator

JanusGraphKryoRegistrator only registers a serializer for Geoshape, while the TinkerPop GryoRegistrator handles many different classes. JanusGraphKryoRegistrator does not extend GryoRegistrator.

We need some clarity on how to configure the Kryo registrator to cover all required TinkerPop and JanusGraph classes. Also will need updates on the documentation and the properties files in the distribution.

Contributor guide

Research direction
Compare JanusGraphKryoRegistrator and GryoRegistrator to understand their class coverage, then update documentation and property files to recommend a combined configuration or clarify the relationship.
Tech stack
java
Domain
backenddatabase
Issue type
Documentation
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
JavaSpark
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60