faust | Python Stream Processing | Stream Processing library
kandi X-RAY | faust Summary
kandi X-RAY | faust Summary
Python Stream Processing
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Top functions reviewed by kandi - BETA
- Restart recovery .
- Returns a function that can be used to build the model .
- Create an async iterator .
- Builds the consumer callback .
- Autodiscover methods .
- Initialize a new instance of this class .
- Initialize the metrics .
- Format an annotation .
- Drain messages from fetcher .
- Verify an event path .
faust Key Features
faust Examples and Code Snippets
Lines of Code : 143
License : No License
CopyFaust supports kafka with version >= 0.10.
.. _`introduction`: http://faust.readthedocs.io/en/latest/introduction.html
.. _`quickstart`: http://faust.readthedocs.io/en/latest/playbooks/quickstart.html
.. _`User Guide`: http://faust.readthedocs. class Greeting(faust.Record):
from_name: str
to_name: str
app = faust.App('hello-app', broker='kafka://localhost')
topic = app.topic('hello-topic', value_type=Greeting)
@app.agent(topic)
async def hello(greetings):
async for greeting in g {
"type": "record",
"namespace": "com.example",
"name": "AvroUsers",
"fields": [
{"name": "first_name", "type": "string"},
{"name": "last_name", "type": "string"}
]
}
# users.models
class UserModel(faust.Record, """LiveCheck Example.
1) First start an instance of the stock ordering system in a new terminal:
.. sourcecode:: console
$ python examples/livecheck.py worker -l info
2) Then in a new terminal, start a LiveCheck instance for this app
.. sour #!/usr/bin/env python
"""Withdrawal example.
Quick Start
===========
1) Start worker:
.. sourcecode:: console
$ ./examples/simple.py worker -l info
2) Start sending example data:
$ ./examples/simple.py produce
"""
import asyncio
import #!/usr/bin/env python
import asyncio
import faust
import json
ITERATIONS = 10_000
EXPECTED_SUM = sum(range(ITERATIONS))
app = faust.App(
'tabletest',
broker='kafka://localhost:9092',
store='rocksdb://',
origin='examples.tabletest',
RUN git clone https://github.com/facebook/rocksdb.git /tmp/rocksdb WORKDIR /tmp/rocksdb RUN git checkout tags/ RUN make shared_lib INSTALL_PATH=/usr && make install && rm -rf /tmp/rocksdb
RUN git checkout tags/v6.1.1
Lines of Code : 3License : Strong Copyleft (CC BY-SA 4.0)Copydef get_value_from_topic():
return next(consumer)
import asyncio
from concurrent.futures import ProcessPoolExecutor
import faust
loop = asyncio.get_event_loop()
app = faust.App('my-app-name', broker='kafka://localhost:9092')
sink = app.topic('topic1')
@app.task()
async def check():
(base) $ anaconda show 'conda-forge/r-purrr'
Using Anaconda API: https://api.anaconda.org
Name: r-purrr
Summary: A complete and consistent functional programming toolkit for R.
Access: public
Package Types: conda
Versions:
+ 0.2.2
Community Discussions
Trending Discussions on faust
QUESTION
I'm trying to send some data from one Kafka topic to another, using sink in Faust agent, and I keep receiving this error:
...ANSWER
Answered 2022-Apr-01 at 12:53Figured it out, I needed to send a faust.Record model, not a dict. from_dict method of faust.Record class can be used to generate a record from dict.
QUESTION
I want to go deeper in the JSON File how what i need to change in the code.
because i need to go deeper in data -> resources-> items-> title
...ANSWER
Answered 2022-Jan-07 at 14:51You can do something like this if you want to extract all titles across all items in resources. Please note that we don't need to cast every single value we are using since dynamic means that Dart should just ignore what we are doing with the object and expect any call on dynamic to also be dynamic:
QUESTION
I'm trying to run Python Faust from Docker.
Based on this documentation: https://faust.readthedocs.io/en/latest/userguide/installation.html
I created a simple Docker file:
...ANSWER
Answered 2021-Dec-27 at 23:37Read the error message, where it is clearly stated you are missing a header file:
fatal error: rocksdb/slice.h: No such file or directory 705 | #include "rocksdb/slice.h" | ^~~~~~~~~~~~~~~~~ compilation terminated. error: command '/usr/bin/gcc' failed with exit code 1
Accordingly, you'll need to build and install RocksDB. This is separate from the installation of faust[rocksdb] with pip. That simply installs python-rocksdb, the Python interface to the underlying libraries.
There is even a (third-party) RocksDB docker image based on Python 3.7 Slim.
You could use that directly or take some tricks from the Dockerfile for that image.
QUESTION
I'm trying to run a simple test if my application is running properly without any issues. My issue is that faust needs a connection to kafka on initialization - so I'm trying to run kafka with zookeeper as services but I'm not able to connect them properly.
Error:
...ANSWER
Answered 2021-Dec-16 at 20:50Glancing over the GitLab CI docs about connecting to different services, it mentions a feature flag to allow cross-service communication, so try
QUESTION
I am using Celery and Kafka to run some jobs in order to push data to Kafka. I also use Faust to connect the workers. But unfortunately, I got an error after running faust -A project.streams.app worker -l info in order to run the pipeline. I wonder if anyone can help me.
ANSWER
Answered 2021-Jul-11 at 19:46I don't know what was wrong with Faust but I run pip install faust by chance and it solved the problem.
QUESTION
[2021-06-18 17:52:53,711: ERROR]: [^Worker]: Error: ImproperlyConfigured('RocksDB bindings not installed? pip install python-rocksdb',)
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/faust/stores/rocksdb.py", line 159, in __init__
import rocksdb as _rocksdb # noqa: F401
File "/usr/local/lib/python3.6/site-packages/rocksdb/__init__.py", line 1, in
from ._rocksdb import *
ImportError: /usr/local/lib/python3.6/site-packages/rocksdb/_rocksdb.cpython-36m-x86_64-linux-gnu.so: undefined symbol: ZSTD_versionNumber
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/mode/worker.py", line 264, in execute_from_commandline
self.loop.run_until_complete(self._starting_fut)
File "/usr/local/lib/python3.6/asyncio/base_events.py", line 488, in run_until_complete
return future.result()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 719, in start
await self._default_start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 726, in _default_start
await self._actually_start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 750, in _actually_start
await child.maybe_start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 778, in maybe_start
await self.start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 719, in start
await self._default_start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 726, in _default_start
await self._actually_start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 750, in _actually_start
await child.maybe_start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 778, in maybe_start
await self.start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 719, in start
await self._default_start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 726, in _default_start
await self._actually_start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 743, in _actually_start
await self.on_start()
File "/usr/local/lib/python3.6/site-packages/faust/tables/manager.py", line 130, in on_start
await self._update_channels()
File "/usr/local/lib/python3.6/site-packages/faust/tables/manager.py", line 140, in _update_channels
await table.maybe_start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 778, in maybe_start
await self.start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 719, in start
await self._default_start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 726, in _default_start
await self._actually_start()
File "/usr/local/lib/python3.6/site-packages/mode/services.py", line 743, in _actually_start
await self.on_start()
File "/usr/local/lib/python3.6/site-packages/faust/tables/base.py", line 195, in on_start
await self.add_runtime_dependency(self.data)
File "/usr/local/lib/python3.6/site-packages/faust/tables/base.py", line 190, in data
self._data = self._new_store()
File "/usr/local/lib/python3.6/site-packages/faust/tables/base.py", line 171, in _new_store
return self._new_store_by_url(self._store or self.app.conf.store)
File "/usr/local/lib/python3.6/site-packages/faust/tables/base.py", line 182, in _new_store_by_url
options=self.options,
File "/usr/local/lib/python3.6/site-packages/faust/stores/rocksdb.py", line 161, in __init__
raise error from exc
faust.exceptions.ImproperlyConfigured: RocksDB bindings not installed? pip install python-rocksdb
ANSWER
Answered 2021-Jun-18 at 20:28Don't use the latest version of anything for automated builds, pin the version to the most recent, tested, working version. It looks like this project uses tags to denote release versions. You'll need to figure out the date of the last build, go to the repository, find the tag immediately preceding the date of the last working build and check it out before running make.
QUESTION
I want to make a flask application/API with gunicorn that on every request-
- reads a single value from a Kafka topic
- does some processing
- and returns the processed value to the user(or any application calling the API).
So, far I couldn't find any examples of it. So, is the following function is the correct way of doing this?
...ANSWER
Answered 2021-May-08 at 14:35This seems okay at first glance. Your consumer iterator is iterated once, and you return that value.
The more idiomatic way to do that would be like this, however
QUESTION
I could not find any answer to this: what is the difference between Faust and kafka-python?
Is there any pros/cons on preferring any one of them?
As I understand it:
- Kafka is written in Java, and Kafka-python is a Python client to communicate with "Java stream"
- Faust is a pure "Python stream"
So, if I plan to use only Python then Faust should be better choice and if I want to have wider compatibility (Go, .NET, C/C#, Java, Python) then use Kafka + Kafka-python?
Note: I am new to using Kafka and I am trying to understand the pros/cons of different solutions.
I would highly appreciate any advice!!
...ANSWER
Answered 2021-Jan-31 at 22:48As I understand it you use both with Kafka, and both from Python, but with the difference that:
- Faust is for stream processing (filtering, joining, aggregating, etc)
kafka-python(just likeconfluent-kafka-pythonalso) is a client library providing Consumer, Producer, and Admin APIs for Kafka.
So you could easily use both, for different purposes, from Python.
QUESTION
P.S. Started an issue https://github.com/robinhood/faust/issues/702
Developing Faust-app:
...ANSWER
Answered 2021-Jan-25 at 14:28Changed code structure for this:
QUESTION
I'm used to search and install packages with apt, under Debian-based distributions, and one useful feature of it is that you can search in the description of packages as well, so you don't need to know the exact name of a package to find it. It can be used in a exploratory way. For example, say I'm searching for packages related to functional programming, but haven't a specific one in mind. I could do just this:
...ANSWER
Answered 2021-Jan-15 at 23:53No, it is not possible to search package descriptions with conda search. The query results of conda search, including those with the --info|-i flag, do not include package description info.
There is limited functionality for retrieving package summaries from Anaconda Cloud. This is provided by the anaconda show command in the package anaconda-client and only provides exact matching (channel and package). For example,
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install faust
You can use faust like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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