dgraph | Native GraphQL Database with graph backend | Database library
kandi X-RAY | dgraph Summary
kandi X-RAY | dgraph Summary
Dgraph is a horizontally scalable and distributed GraphQL database with a graph backend. It provides ACID transactions, consistent replication, and linearizable reads. It's built from the ground up to perform for a rich set of queries. Being a native GraphQL database, it tightly controls how the data is arranged on disk to optimize for query performance and throughput, reducing disk seeks and network calls in a cluster. Dgraph's goal is to provide Google production level scale and throughput, with low enough latency to be serving real-time user queries, over terabytes of structured data. Dgraph supports GraphQL query syntax, and responds in JSON and Protocol Buffers over GRPC and HTTP.
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Trending Discussions on dgraph
QUESTION
etcd is use to consensus metadata in Kubernetes. I can see Dgraph BadgerDB and other key value stores are using etcd, but I don't know quite how they are using it. Update: It looks like they are using a raft subset of etcd.
My question:etcd is for storing metadata and not data as such - is it possible/recommended to combine etcd with another key value store to handle large data?
I have also looked at hashicorp raft
...ANSWER
Answered 2022-Jan-27 at 09:08The etcd service was conceived to handle metadata: retrieve one key, get some data wich usually in the kilobytes range. Not megabytes.
You cannot "offlad" etcd to another database / datastore. Etcd need to have its data with low latency on the majority of nodes.
The biggest criticism about etcd are hardware requirements: 8GB RAM x 3 machines might be too much for some use cases.
Is it etcd good for you? It depends a lot on:
- Your workload (mostly read-oriented than write-oriented)
- How many requests you need from etcd in a short time period: do not 'fire' too many requests at once to etcd or you might trigger a leader election.
- And your data size: use
--auto-compaction
enabled to keep disk usage as low as possible removing old data versions.
QUESTION
Add data using DQL mutation https://github.com/dgraph-io/dgo#running-a-mutation and these data to also be visible via graphql.
Dgraph version: v21.03.2
DQL schema:
...ANSWER
Answered 2021-Oct-07 at 12:51The issue is because the dgraph also wants a DType
to be passed via dql mutation like so:
QUESTION
The current deployment Dockerfile contains this
...ANSWER
Answered 2021-Sep-28 at 09:40It is not possible: every Web Dyno exposes only one port which is provided at runtime with the $PORT
env variable.
You can deploy each component into its own Dyno (they will then communicate over HTTPS).
Or you could look at Heroku Private Spaces which is an enterprise feature.
QUESTION
I am trying to install Dgraph. Here is what I did:
I created a dev
cluster by k3d by
ANSWER
Answered 2021-Aug-09 at 15:13Found the issue, it is because the Dgraph yaml hard coded .svc.cluster.local
.
Opened the pull request at https://github.com/dgraph-io/dgraph/pull/7976 to resolve the issue.
QUESTION
ANSWER
Answered 2021-May-19 at 14:06To model a pivot table that is only a linking pivot table holding no additional information, then you model it as you did above. However, if your pivot table contains additional information regarding the relationship, then you will need to model it with an intermediate linking type. Almost the same idea as above. I prefer these linking types to have a name describing the link. For instance I named it in this case Stock
but that name could be anything you want it to be. I also prefer camelCase for field names so my example reflects this preference as well. (I added some search directives too)
QUESTION
I am trying to display the chartist graph if the user clicks the button. But when I was doing this I was facing the problem that, if I display the graph normally then it will show properly but if I put the ajax show() the all the graph is getting shrink as given in the image below.
On button clicked display of graph
Demo.html
...ANSWER
Answered 2021-Apr-20 at 03:57Just move chart initialization to inside click
QUESTION
ANSWER
Answered 2021-Feb-04 at 11:09What a well-asked first question. Welcome to Stackoverflow.
Your code is fine. You are running into a limitation of networkx, which does not keep track of the arc of the edge when labelling edges. Instead, it places edge labels on a straight line between the two nodes; by default, it chooses the center of that straight line. This has two consequences for your plot:
- the edge labels are slightly offset w.r.t. your edge paths, and
- labels on bi-directional edges are plotted on top of each other.
There is no solution for the first issue; however, you can work around the second issue by specifying the argument label_pos
to anything other than 0.5.
For example, changing your code to
QUESTION
I'm considering making hundreds of thousands of nodes with their own labels and connecting them to each other via millions of edges.
Has this sort of thing been benchmarked anywhere with Neo4j, Dgraph, or any other graph db?
...ANSWER
Answered 2021-Jan-05 at 18:35Yes, 4 billions in Neo4j, reference here : https://neo4j.com/docs/operations-manual/current/tools/store-info/#neo4j-admin-store-format-versions
QUESTION
I have an Authorization Server which is happily returning various ‘out of the box’ and custom claims as necessary which is great.
The back-end (DGraph GraphQL hosted server https://slash.dgraph.io/) requires a ‘namespace’ for the claims I want it to use but all of the claims in my token are at the root of the payload.
My example JWT payload from Okta is:
...ANSWER
Answered 2021-Jan-05 at 11:30You'll need to create your namespace as one claim within the authorization server, then add each of the claims within the namespace inside of that claim's value inside of {} as if you were writing JSON.
Value for copy paste simplicity {"one":"one", "two":"two", "username": appuser.userName}
The expression language will still be evaulated so you can use conditionals and values from the user's profile as you would normally.
QUESTION
I am trying to understand and compare the output I see from htop (sorted by mem%) and "ps aux --sort=-%mem | grep query.jar" and determine why 24.2G out of 32.3G is in use on an idle server.
The ps command shows a single parent (not child process I assume):
...ANSWER
Answered 2021-Jan-02 at 20:49The primary difference between htop
and ps aux
is that htop
shows each individual thread belonging to a process rather than the process only - this is similar to ps auxm
. Using the htop
interactive command H
, you can hide threads to get to a list that more closely corresponds to ps aux
.
In terms of memory usage, those additional entries representing individual threads do not affect the actual memory usage total because threads share the address space of the associated process.
RSS
(resident set size) in general is problematic because it does not adequately represent shared pages (due to shared memory or copy-on-write) for your purpose - the sum can be higher than expected in those cases. You can use smem -t
to get a better picture with the PSS
(proportional set size) column. Based on the facts you provided, that is not your issue, though.
In your case, it might make sense to dig deeper via smem -tw
to get a memory usage breakdown that includes (non-cache) kernel resources. /proc/meminfo
provides further details.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install dgraph
If you're using Docker, you can use the official Dgraph image.
If you want to install from source, install Go 1.13+ or later and the following dependencies:.
Then clone the Dgraph repository and use make install to install the Dgraph binary to $GOPATH/bin.
Installation to queries in 3 steps via dgraph.io/docs/.
A longer interactive tutorial via dgraph.io/tour/.
Tutorial and presentation videos on YouTube channel.
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