[ATLAS-1403] Perf and stability improvements to DSL search and lineage to search only by typeNames

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.7-incubating
• Fix Version/s: 0.8-incubating, 0.7.1-incubating
• Assignee: Suma Shivaprasad
• Reporter: Suma Shivaprasad
• Created: 20/Dec/16 00:26
• Updated: 25/Jan/17 09:35
• Resolved: 09/Jan/17 18:49

Description

Currently DSL uses a fill function during Gremlin Translation to merge results by typeName and superTypeName and fill function loads the resulting vertices in memory. This causes significant memory usage and ATLAS server spends lot of time doing GC instead of useful work resulting in OOO sometimes ( when GC is not able to recover and search queries are run in parallel)

The proposal is to replace this with typeName checks along by finding all the subtypes for a given type and using an IN clause in the filter.

For eg:

Query = Person where (birthday < "1950-01-01T02:35:58.440Z") limit 40 offset 0

Optimized query

Gremlin Query = L:

{g.V.has("__typeName", T.in, ['Person','Manager']).and(_().has("Person.birthday", T.lt, -631142641560)) [0..<40].toList()}