RAG Systems

Haystack text generation ignoring stop sequences in Kubernetes

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Problem Description In a Kubernetes‑deployed Haystack microservice stack, the generate endpoint returns text that continues past the user‑specified stop sequence. The symptom is observable both in API responses and in logs such as: GenerationError: stop token not found in generated sequence – stop=’\nAnswer:’ Traceback (most recent call last): File “/app/pipelines/generation.py”, line 112, in _run_generation generated … Read more

Haystack audio processing fails with empty document metadata

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Haystack Audio Processing Fails with Empty Document Metadata Problem Description During document ingestion, audio files are passed through the AudioDocumentConverter and Speech2Text nodes but the resulting Document.text field is empty and the metadata columns in PostgreSQL contain NULL or truncated values. The pipeline completes without raising an exception, yet the indexed documents contain no transcription … Read more

LangChain PVC stuck in pending state after deployment

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Problem – LangChain PVC Stuck in Pending After Deployment When deploying LangChain components (e.g., the vector‑store or document‑loader pods) on a managed Kubernetes cluster with dynamic storage provisioning enabled, the associated PersistentVolumeClaim (PVC) often remains in the Pending state. The pod cannot start, leading to crash loops and a non‑functional AI workflow. Typical symptoms observed in … Read more

LlamaIndex inference queue backlog during A/B testing

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Problem – Inference Queue Backlog During A/B Testing During a recent high‑traffic A/B test two LlamaIndex variants (A and B) were deployed side‑by‑side in a Kubernetes cluster. Users of the test variant experienced: Latency spikes from ~200 ms to >30 s. HTTP 503 responses with the log line Inference queue full: max_queue_size reached. Increasing numbers of “Worker … Read more

Haystack SSL/TLS handshake failure with self-signed certificates

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Problem – Haystack TLS Handshake Fails in a Local Development Sandbox When running a multi‑service Haystack stack with Docker Compose, the inter‑node RPC layer aborts with TLS errors such as: SSLHandshakeException: certificate verify failed (self signed certificate in certificate chain) javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated OpenSSL error: verify error:num=20:unable to get local issuer certificate HaystackNodeError: TLS … Read more

Haystack DocumentRetriever context window overflow with long documents

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Problem – Context Window Overflow When Using Haystack DocumentRetriever In a production data pipeline that ingests long technical reports (PDFs, Word docs, etc.), the DocumentRetriever backed by ElasticsearchDocumentStore returns whole document sections that exceed the token limit of downstream LLMs. The pipeline aborts with errors such as: Token limit exceeded: 8192 tokens (max 4096) ElasticsearchDocumentStoreError: Document … Read more

Haystack ConfigMap mount error in multi-region Kubernetes deployment

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Problem – ConfigMap/Secret Mount Errors in a Multi‑Region Haystack Deployment In a production Haystack deployment spanning multiple AWS regions, pods repeatedly fail during initialization with messages such as: Error: “failed to sync config: open /etc/haystack/config.yaml: no such file or directory” MountVolume.SetUp failed for volume “config” : hostPath type check failed: path /etc/haystack does not exist … Read more

LlamaIndex training loop rejected by admission controller Kubernetes

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Problem Description The LlamaIndex training loop fails to start in a Kubernetes‑based ML platform. The pod creation request is rejected by the llamaindex-validation admission webhook. Typical error output from kubectl describe pod looks like: Error from server (BadRequest): admission webhook “llamaindex-validation” denied the request: unauthorized access to secret “llama-index-config” Other observed rejections include: “pod llamaindex-trainer-7f9c9d … Read more

LlamaIndex token limit exceeded during model evaluation

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Problem – Token Limit Exceeded During Model Evaluation with LlamaIndex When running automated evaluation of a large document corpus through LlamaIndex, the evaluation script aborts with errors such as: openai.error.InvalidRequestError: This model’s maximum context length is 4096 tokens ValueError: Prompt exceeds max_input_size (got 5273 tokens, max allowed 4096) RuntimeError: Token limit exceeded while building prompt … Read more

Haystack query decomposition error with FAISS index on A100 GPU

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Problem Description In a distributed Retrieval‑Augmented Generation (RAG) pipeline built with Haystack 1.19.x, the query_decomposition step crashes when the FAISS index is placed on an A100/H100 GPU. Typical error messages observed in the logs are: Traceback (most recent call last): File “…/haystack/pipeline/pipeline.py”, line 312, in run results = component.run(**inputs) File “…/haystack/nodes/retriever/faiss.py”, line 421, in run … Read more