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  2. Getting Edges - Performance

Re: Getting Edges - Performance

Joe Obernberger
 

Thank you Boxuan - the code (REST service) that is modifying the graph is being called continuously when running.  A slow example looks like this:

Metrics: Traversal Metrics
Step                                                               Count  Traversers       Time (ms)    % Dur
=============================================================================================================
JanusGraphStep([],[edgeID.eq(DS_106|geotime|hou...                     1           1        1393.727   100.00
  constructGraphCentricQuery                                                                   0.011
  GraphCentricQuery                                                                         1393.698
    \_condition=(edgeID = DS_106|geotime|hour 1km|2022-6-14T4|18SVK 86 22|Date,Actor2Geo_Long_Actor2Geo_Lat)
    \_orders=[]
    \_isFitted=true
    \_isOrdered=true
    \_query=multiKSQ[1]
    \_index=byEdgeIDComposite
    backend-query                                                      1                    1393.128
    \_query=byEdgeIDComposite:multiKSQ[1]
                                            >TOTAL                     -           -        1393.727        -

Code is:
System.out.println("Metrics: "+traversal.E().has("edgeID", edgeID).profile().next().toString());
dataSourceToCorrelationEdge = traversal.E().has("edgeID", edgeID).next();

If the time to run that exceeds 500mSec, I print the message.

-Joe

On 6/23/2022 4:15 PM, Boxuan Li wrote:
Profiler documentation is available here: https://tinkerpop.apache.org/docs/current/reference/#profile-step 

Can you do

traversal.E().has("edgeID", edgeID).profile().next()

and paste the output (when you experience the slowness) here?

Best,
Boxuan

On Jun 23, 2022, at 2:29 PM, Joe Obernberger via lists.lfaidata.foundation <joseph.obernberger=gmail.com@...> wrote:

Looking for documentation on how to do profile() - do you have any?

Queries like this are also slow:
Edge dataSourceToCorrelationEdge = traversal.E().has("edgeID", edgeID).next();

There is an index on edgeID (mgmt.buildIndex("byEdgeIDComposite", Edge.class).addKey(edgeID).unique().buildCompositeIndex();)
I'm trying to cache the actual JanusGraph edgeID string in an outside cache to help with this, but when it's not in the cache, it can take 2 seconds to return.

-Joe

On 6/22/2022 4:53 PM, Boxuan Li wrote:
It's very suspicious. It shouldn't take 3 seconds just to load 3 edges. Can you provide the profile()​ output here when you see such slowness? It is also worth trying if other queries (e.g. loading a vertex) experience similar slowness.
From: janusgraph-users@... <janusgraph-users@...> on behalf of Joe Obernberger via lists.lfaidata.foundation<joseph.obernberger=gmail.com@...>
Sent: Wednesday, June 22, 2022 4:51 PM
To: janusgraph-users@... <janusgraph-users@...>
Subject: Re: [janusgraph-users] Getting Edges - Performance
 
It's usually small; typically around 3 edges.
Reading your article (https://li-boxuan.medium.com/janusgraph-deep-dive-part-3-speed-up-edge-queries-3b9eb5ba34f8).
Outbound edges could be large - 100s to 10000s.

-Joe

On 6/22/2022 4:49 PM, Boxuan Li wrote:
When it takes over 3 seconds to return, how many edges does it return?
From: janusgraph-users@... <janusgraph-users@...> on behalf of Joe Obernberger via lists.lfaidata.foundation<joseph.obernberger=gmail.com@...>
Sent: Wednesday, June 22, 2022 1:06 PM
To: janusgraph-users@... <janusgraph-users@...>
Subject: [janusgraph-users] Getting Edges - Performance
 
Hi All - I'm seeing a performance issue with this statement in Java code:

Iterator<Edge> edgeIt = vert.edges(Direction.IN);

in some cases this is taking over 3 seconds to return.  What can I do to 
better this performance?
Thank you!

-Joe


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