DeepSeekStreamingIncompleteError
deepseek.errors.DeepSeekStreamingIncompleteError
Stack trace
deepseek.errors.DeepSeekStreamingIncompleteError: Streaming response ended before completion. Received partial data chunk.
File "/app/deepseek_client.py", line 45, in stream_response
raise DeepSeekStreamingIncompleteError("Streaming response incomplete")
File "/app/deepseek_client.py", line 30, in fetch_stream
for chunk in client.stream():
File "/usr/local/lib/python3.10/site-packages/deepseek/api.py", line 120, in stream
if not self._streaming_complete:
Why it happens
DeepSeek streaming responses rely on continuous data chunks until a completion signal is received. Network interruptions, server-side timeouts, or client-side premature cancellations cause the stream to end early, triggering this error.
Detection
Monitor streaming call durations and data chunk counts; log partial responses and detect if the final completion token or signal is missing before processing.
Causes & fixes
Network instability or timeout causing the stream to cut off before completion
Implement retry logic with exponential backoff on streaming failures and ensure network stability during streaming calls.
Client-side code prematurely closing the stream or not fully consuming the iterator
Ensure the client fully iterates over the streaming generator until completion before closing the connection.
Server-side rate limiting or internal errors causing abrupt stream termination
Check server logs for rate limit errors and handle rate limit responses by backing off and retrying the stream request.
Code: broken vs fixed
from deepseek import DeepSeekClient
client = DeepSeekClient(api_key='my_api_key')
# This will raise DeepSeekStreamingIncompleteError if stream ends early
for chunk in client.stream(query='example'):
if some_condition:
break # prematurely breaks stream causing incomplete errorimport os
import time
from deepseek import DeepSeekClient, DeepSeekStreamingIncompleteError
client = DeepSeekClient(api_key=os.environ['DEEPSEEK_API_KEY'])
try:
for chunk in client.stream(query='example'):
process(chunk)
except DeepSeekStreamingIncompleteError:
# Retry logic on incomplete stream
for retry in range(3):
try:
for chunk in client.stream(query='example'):
process(chunk)
break
except DeepSeekStreamingIncompleteError:
if retry == 2:
raise
time.sleep(2 ** retry) # exponential backoff
print('Stream processed successfully')Workaround
Wrap the streaming call in try/except DeepSeekStreamingIncompleteError, then extract and process any partial data received before retrying the stream.
Prevention
Use DeepSeek's built-in streaming client with automatic reconnection and backpressure handling, and monitor network stability to avoid premature stream termination.