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[Bug] Segmentation fault when properties exceed ~100kb #223

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@emanueledomingo

Hi everyone, i'm running an event driven app and i use apache pulsar as backbone. I use message's properties to exchange metadata between the services.

I noted that, when the properties exceed ~100kb the client gives Segmentation fault (core dumped) (sometimes corrupted double-linked list instead)

I haven't done a proper test on the size, so take the size as a guideline

I was able to simulate the behaviour in a notebook:

import pulsar
import sys
import json

# need to serialize to json nested object because client accepts properties only
# of type (self: _pulsar.MessageBuilder, arg0: str, arg1: str)
nested_dict = json.dumps({
    "foo": "bar"
})

big_dict = {
    f"key{i}": nested_dict for i in range(3000)
}

print(sys.getsizeof(big_dict))  # 103856

client = pulsar.Client('pulsar://localhost:6650')
producer = client.create_producer('test-topic')

producer.send(content="test-message".encode(), properties=big_dict)  # segfault

Unfortunately i don't have details in the stacktrace:

In [4]: producer.send(content="test-message".encode(), properties=big_dict)
Segmentation fault (core dumped)

Pulsar client version is 3.5.0.

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