libev | libev sync from http : //cvs.schmorp.de/libev/ | Data Processing library

when i'm try to clone repository by command

According to the libevent book:

Deferred callbacks

By default, a bufferevent callbacks are executed immediately when the corresponding condition happens. (This is true of evbuffer callbacks too; we’ll get to those later.) This immediate invocation can make trouble when dependencies get complex. For example, suppose that there is a callback that moves data into evbuffer A when it grows empty, and another callback that processes data out of evbuffer A when it grows full. Since these calls are all happening on the stack, you might risk a stack overflow if the dependency grows nasty enough.

To solve this, you can tell a bufferevent (or an evbuffer) that its callbacks should be deferred. When the conditions are met for a deferred callback, rather than invoking it immediately, it is queued as part of the event_loop() call, and invoked after the regular events' callbacks.

As described above:

1. The event loop fetches a batch of events, and processes them one by one immediately.
2. Before the fetched events are processed, any new event won't be fetched and processed.
3. If an event was marked as BEV_OPT_DEFER_CALLBACKS, then it will be processed after all other events in the same batch are processed.

Provided two callbacks ca and cb. First, ca is called, ca finds evbuffer_A is empty, then writes a message into it.

Then, cb is called, and cb finds evbuffer_A contains a message, then fetch and send it out.

When cb is called, ca's stack has been released. I think there won't be a stack overflow in such a scenario.

So, my question is:

What's the purpose of deferred callbacks in libevent?

I am trying to install the Python package gevent with pip3 install gevent; the OS is Amazon Linux 2. The installation starts, but then at some point it stops with this error:

I'm trying to write a series of modulefiles that can be used to load software installed under each user's account in a cluster setting. Since the software is installed per person under similar paths up-to a username changing, I'm trying to dynamically set the base path value in the modulefile.

For instance, if I could use an absolute path, then I would set a BASEPATH like so:

This question appears to have been answered before, but none of the answers helped in my case. First I should say that I've followed the OSMnx Installation steps exactly. Then tried to run the following code in a Jupyter Notebook:

I am trying to do a simple read and count of a small parquet file (10K records) using dask-yarn on an AWS EMR cluster with one master and one worker node, both are m5.xlarge instances.

I am trying to execute the following code just to test my cluster:

I am not a conan expert, so maybe there is an obvious solution for this. But it can't be trivial since I am struggling with this for a while and can't find a solution.

We need parquet for our project, we include this via the conan arrow package like this, conanfile.txt:

I am working in a Java spring boot application, running as a docker container.

The main purose of this application was to execute python scripts. So inside the docker container, I had to make available python environment. I added the python runtime with this code. But seems this is very basic python verson and I can not make other important libraries available.

Like, I wanted to add 'asyncpg' library so that I can use connection pool.

But it is not letting me to add asyncpg library.

Below is the docker file.

Note: I have commented '#FROM python:3.6-alpine', if I make this open then java runtime will not be available which is 'FROM openjdk:8u191-jre-alpine3.8'

------- Docker file --------------

I am quite new to Hiredis/Redis and can't manage to create a working publisher in a while loop for a Pub/Sub architecture.
I succeeded in creating a publisher firing only one message, then exiting. But I'm trying to have a publisher sending messages regularly. Here is my publisher: