Accessing postgres db in redisrabbitmqcelery kills python task with signal 11

When working with Python, it is not uncommon to encounter errors or issues that can be quite frustrating to solve. One such problem is when accessing a PostgreSQL database in Redis, RabbitMQ, and Celery, which can result in the Python task being killed with signal 11. In this article, we will explore three different solutions to this problem.

Solution 1: Increase Memory Limit

One possible reason for the Python task being killed with signal 11 is that it is running out of memory. To solve this, you can try increasing the memory limit for the task. This can be done by modifying the configuration file for the task or by setting the memory limit directly in the code.


import resource

# Increase memory limit to 1GB
resource.setrlimit(resource.RLIMIT_AS, (1e9, -1))

By increasing the memory limit, you provide more resources for the task to use, potentially preventing it from being killed with signal 11. However, this solution may not always be effective, especially if the task requires more memory than the system can provide.

Solution 2: Optimize Database Queries

Another possible reason for the task being killed with signal 11 is that the database queries being executed are too resource-intensive. To solve this, you can try optimizing the queries to reduce their memory and CPU usage. This can be done by analyzing the queries and identifying any potential bottlenecks or inefficiencies.


# Optimize database queries
# Example: Use indexes to speed up query execution
CREATE INDEX idx_name ON table_name (column_name);

By optimizing the database queries, you can reduce the strain on the system and potentially prevent the task from being killed with signal 11. However, this solution may require a deep understanding of the database structure and query optimization techniques.

Solution 3: Upgrade Dependencies

Lastly, the issue could be caused by outdated or incompatible dependencies. To solve this, you can try upgrading the dependencies used by the task, including PostgreSQL, Redis, RabbitMQ, and Celery. This can be done by updating the packages using package managers like pip or conda.


# Upgrade dependencies using pip
pip install --upgrade package_name

By upgrading the dependencies, you ensure that you are using the latest versions with bug fixes and performance improvements. This can potentially resolve any compatibility issues that may be causing the task to be killed with signal 11.

After exploring these three solutions, it is clear that the best option depends on the specific circumstances of the problem. If the task is running out of memory, increasing the memory limit may be the most effective solution. If the issue lies with the database queries, optimizing them can provide significant improvements. Lastly, if the dependencies are outdated or incompatible, upgrading them is the way to go. It is recommended to try each solution and evaluate its effectiveness in your particular scenario.

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12 Responses

    1. Ive tried Solution 2 and it was a complete waste of time. I cant believe anyone would suggest such a useless fix. Save yourself the trouble and look for a better solution. Trust me, youll thank me later.

    1. Seriously? Solution 2? Are you kidding me? Ive tried that and it made things worse! #TeamSignal11 all the way. Stop spreading false hope.

  1. Wow, signal 11 strikes again! 🤯 Solution 2 sounds promising, but Id also consider Solution 4: Sacrifice a goat to appease the tech gods. 🐐🙏

    1. I know, right? Its insane how something as innocent as a database connection can bring down a whole Python task. Technology can be a real pain, but hey, thats what keeps us on our toes!

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